1
|
Chikaoka Y, Tashiro T, Sawayama S, Kobayashi A, Matsumoto A, Iwama E, Naoi K, Fujii K. A structural study on a specific Li-ion ordered complex in dimethyl carbonate-based dual-cation electrolytes. Phys Chem Chem Phys 2024; 26:3920-3926. [PMID: 38230686 DOI: 10.1039/d3cp05526d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Dimethyl carbonate (DMC) is a linear carbonate solvent commonly used as an electrolyte for electric double-layer capacitors (EDLCs) and Li-ion batteries. However, there are serious problems with the use of DMC as an electrolyte solvent: (1) low ionic conductivity when using Li salts (e.g. LiBF4) and (2) liquid-liquid phase separation when using spiro-type quaternary ammonium salts (e.g. SBPBF4). Dual-cation electrolytes, i.e., bi-salt (SBPBF4 and LiBF4) in DMC, are promising candidates to avoid the phase separation issue and to enhance the total and Li+ conductivities. Herein, we reported a specific Li-ion structure in DMC-based dual-cation electrolytes by combining high-energy X-ray total scattering (HEXTS) and all-atom molecular dynamics (MD) simulations. Quantitative radial distribution function analysis based on experimental and simulation results revealed that the phase-separated SBPBF4/DMC (i.e., the bottom phase of 1 M SBPBF4/DMC) forms long-range ion ordering based on the structured SBP+-BF4- ion pairs. When adding LiBF4 salt into SBPBF4/DMC (i.e., dual-cation electrolyte), the ordered SBP+-BF4- structure disappeared owing to the formation of Li-ion solvation complexes. We found that in the dual-cation electrolyte Li ions form multiple Li+-Li+ ordered complexes in spite of relatively low Li-salt concentration (1 M), being a promising Li+-conducting medium with reduced Li salt usage and low viscosity.
Collapse
Affiliation(s)
- Yu Chikaoka
- Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan.
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Tomoya Tashiro
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan.
| | - Saki Sawayama
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan.
| | - Ayana Kobayashi
- Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan.
| | - Ayuna Matsumoto
- Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan.
| | - Etsuro Iwama
- Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan.
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Katsuhiko Naoi
- Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan.
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Kenta Fujii
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan.
| |
Collapse
|
2
|
Chikaoka Y, Okuda R, Hashimoto T, Kuwao M, Naoi W, Iwama E, Naoi K. Degradation of Li3V2(PO4)3-based full-cells containing Li4Ti5O12 or Li3.2V0.8Si0.2O4 anodes modeled by charge-discharge cycling simulations. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
3
|
Okita N, Iwama E, Takami Y, Abo S, Naoi W, Rozier P, Simon P, Reid MTH, Naoi K. The origin of stability and high Co 2+/3+ redox utilization for FePO 4-coated LiCo 0.90Ti 0.05PO 4/MWCNT nanocomposites for 5 V class lithium ion batteries. RSC Adv 2022; 12:26192-26200. [PMID: 36275114 PMCID: PMC9477067 DOI: 10.1039/d2ra03144b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 09/01/2022] [Indexed: 11/24/2022] Open
Abstract
Highly-dispersed 10 wt% FePO4 (FP)-coated LiCo0.90Ti0.05PO4 (LCTP) was successfully synthesized within a multiwalled carbon nanotube matrix via our original ultracentrifugation process. 10 wt% FP-coated LCTP sample showed a higher discharge capacity of 116 mA h g−1 together with stable cycle performance over 99% of capacity retention at the 100th cycle in high voltage. A combination of TEM, XRD, XPS, and XAFS analyses suggests that (i) Ti4+-substitution increases the utilization of Co redox (capacity increase) in LCP crystals by suppressing the Co3O4 formation and creating the vacancies in Co sites, and (ii) the FP-coating brought about the Fe enrichment of the surface of LCTP which prevents an irreversible crystal structure change and electrolyte decomposition during cycling, resulting in the stable cycle performance. The Fe3+-rich surface on LiCoPO4 prevents from irreversible crystal structure change and electrolyte decomposition, leading to long term cyclability, while Ti4+-substitution contributes to the higher utilization of Co in LiCo0.9Ti0.05PO4 crystals.![]()
Collapse
Affiliation(s)
- Naohisa Okita
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588 Japan
| | - Etsuro Iwama
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588 Japan
- Advanced Capacitor Research Center, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Yusuke Takami
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Shingo Abo
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Wako Naoi
- Advanced Capacitor Research Center, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
- Division of Art and Innovative Technologies, K & W Inc., 1-3-16-901 Higashi, Kunitachi, Tokyo 186-0002, Japan
| | - Patrick Rozier
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588 Japan
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), France CNRS 3459
- CIRIMAT, Université de Toulouse, CNRS, Université Toulouse 3 – Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex 9, France
| | - Patrice Simon
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588 Japan
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), France CNRS 3459
- CIRIMAT, Université de Toulouse, CNRS, Université Toulouse 3 – Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex 9, France
| | - McMahon Thomas Homer Reid
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588 Japan
- Advanced Capacitor Research Center, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
- Simpetus LLC., 1 Fitchburg St, Somerville, MA 02143, USA
| | - Katsuhiko Naoi
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588 Japan
- Advanced Capacitor Research Center, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| |
Collapse
|
4
|
Goubard-Bretesché N, Crosnier O, Douard C, Iadecola A, Retoux R, Payen C, Doublet ML, Kisu K, Iwama E, Naoi K, Favier F, Brousse T. Unveiling Pseudocapacitive Charge Storage Behavior in FeWO 4 Electrode Material by Operando X-Ray Absorption Spectroscopy. Small 2020; 16:e2002855. [PMID: 32656960 DOI: 10.1002/smll.202002855] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Indexed: 06/11/2023]
Abstract
In nanosized FeWO4 electrode material, both Fe and W metal cations are suspected to be involved in the fast and reversible Faradaic surface reactions giving rise to its pseudocapacitive signature. In order to fully understand the charge storage mechanism, a deeper insight into the involvement of the electroactive cations still has to be provided. The present paper illustrates how operando X-ray absorption spectroscopy is successfully used to collect data of unprecedented quality allowing to elucidate the complex electrochemical behavior of this multicationic pseudocapacitive material. Moreover, these in-depth experiments are obtained in real time upon cycling the electrode, which allows investigating the reactions occurring in the material within a realistic timescale, which is compatible with electrochemical capacitors practical operation. Both Fe K-edge and W L3 -edge measurements point out the involvement of the Fe3+ /Fe2+ redox couple in the charge storage while W6+ acts as a spectator cation. The result of this study enables to unambiguously discriminate between the Faradaic and capacitive behavior of FeWO4 . Beside these valuable insights toward the full description of the charge storage mechanism in FeWO4 , this paper demonstrates the potential of operando X-ray absorption spectroscopy to enable a better material engineering for new high capacitance pseudocapacitive materials.
Collapse
Affiliation(s)
- Nicolas Goubard-Bretesché
- Institut des Matériaux Jean Rouxel (IMN), CNRS UMR 6502 - Université de Nantes, Nantes, 44322 Cedex 3, France
- Réseau sur le Stockage Electrochimique de l'Energie, CNRS FR 3459, Amiens, 80039 Cedex, France
| | - Olivier Crosnier
- Institut des Matériaux Jean Rouxel (IMN), CNRS UMR 6502 - Université de Nantes, Nantes, 44322 Cedex 3, France
- Réseau sur le Stockage Electrochimique de l'Energie, CNRS FR 3459, Amiens, 80039 Cedex, France
| | - Camille Douard
- Institut des Matériaux Jean Rouxel (IMN), CNRS UMR 6502 - Université de Nantes, Nantes, 44322 Cedex 3, France
- Réseau sur le Stockage Electrochimique de l'Energie, CNRS FR 3459, Amiens, 80039 Cedex, France
| | - Antonella Iadecola
- Réseau sur le Stockage Electrochimique de l'Energie, CNRS FR 3459, Amiens, 80039 Cedex, France
| | - Richard Retoux
- CRISMAT-CNRS/UMR 6508, ENSICAEN, Université de Caen Basse-Normandie, Caen, 14050 Cedex 4, France
| | - Christophe Payen
- Institut des Matériaux Jean Rouxel (IMN), CNRS UMR 6502 - Université de Nantes, Nantes, 44322 Cedex 3, France
| | - Marie-Liesse Doublet
- Réseau sur le Stockage Electrochimique de l'Energie, CNRS FR 3459, Amiens, 80039 Cedex, France
- Institut Charles Gerhardt Montpellier (ICGM), CNRS, ENSCM - Université de Montpellier, Montpellier, 34095 Cedex 5, France
| | - Kazuaki Kisu
- Advanced Capacitor Research Center, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
- Global Innovation Research Organization, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Etsuro Iwama
- Advanced Capacitor Research Center, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
- Global Innovation Research Organization, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Katsuhiko Naoi
- Advanced Capacitor Research Center, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
- Global Innovation Research Organization, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Frédéric Favier
- Réseau sur le Stockage Electrochimique de l'Energie, CNRS FR 3459, Amiens, 80039 Cedex, France
- Institut Charles Gerhardt Montpellier (ICGM), CNRS, ENSCM - Université de Montpellier, Montpellier, 34095 Cedex 5, France
| | - Thierry Brousse
- Institut des Matériaux Jean Rouxel (IMN), CNRS UMR 6502 - Université de Nantes, Nantes, 44322 Cedex 3, France
- Réseau sur le Stockage Electrochimique de l'Energie, CNRS FR 3459, Amiens, 80039 Cedex, France
- Global Innovation Research Organization, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| |
Collapse
|
5
|
|
6
|
Naoi K, Kurita T, Abe M, Furuhashi T, Abe Y, Okazaki K, Miyamoto J, Iwama E, Aoyagi S, Naoi W, Simon P. Ultrafast Nanocrystalline-TiO2 (B)/Carbon Nanotube Hyperdispersion Prepared via Combined Ultracentrifugation and Hydrothermal Treatments for Hybrid Supercapacitors. Adv Mater 2016; 28:6751-7. [PMID: 27229372 DOI: 10.1002/adma.201600798] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 04/29/2016] [Indexed: 05/24/2023]
Abstract
Anisotropically grown (b-axis short) single-nano TiO2 (B), uniformly hyper-dispersed on the surface of multiwalled carbon nanotubes (MWCNT), was successfully synthesized via an in situ ultracentrifugation (UC) process coupled with a follow-up hydrothermal treatment. The uc-TiO2 (B)/MWCNT composite materials enable ultrafast Li(+) intercalation especially along the b-axis, resulting in a capacity of 235 mA h g(-1) per TiO2 (B) even at 300C (1C = 335 mA g(-1) ).
Collapse
Affiliation(s)
- Katsuhiko Naoi
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
- Division of Art and Innovative Technologies, K & W Inc., 1-3-16-901 Higashi, Kunitachi, Tokyo, 186-0002, Japan
- Advanced Capacitor Research Center, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
| | - Takayuki Kurita
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
| | - Masayuki Abe
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
| | - Takumi Furuhashi
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
| | - Yuta Abe
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
| | - Keita Okazaki
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
| | - Junichi Miyamoto
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
- Advanced Capacitor Research Center, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
| | - Etsuro Iwama
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
| | - Shintaro Aoyagi
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
| | - Wako Naoi
- Division of Art and Innovative Technologies, K & W Inc., 1-3-16-901 Higashi, Kunitachi, Tokyo, 186-0002, Japan
| | - Patrice Simon
- Global Innovation Research Organization, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8558, Japan
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, Toulouse, 31062, Cedex 9, France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), FR CNRS, 3459, France
| |
Collapse
|
7
|
Kidokoro T, Tanaka H, Naoi K, Ueno K, Yanaoka T, Kashiwabara K, Miyashita M. Sex-specific associations of moderate and vigorous physical activity with physical fitness in adolescents. Eur J Sport Sci 2016; 16:1159-66. [PMID: 27232730 DOI: 10.1080/17461391.2016.1183050] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The present study examined the sex-specific associations of moderate and vigorous physical activity (VPA) with physical fitness in 300 Japanese adolescents aged 12-14 years. Participants were asked to wear an accelerometer to evaluate physical activity (PA) levels of various intensities (i.e. moderate PA (MPA), 3-5.9 metabolic equivalents (METs); VPA, ≥6 METs; moderate to vigorous PA (MVPA), ≥3 METs). Eight fitness items were assessed (grip strength, bent-leg sit-up, sit-and-reach, side step, 50 m sprint, standing long jump, handball throw, and distance running) as part of the Japanese standardised fitness test. A fitness composite score was calculated using Japanese fitness norms, and participants were categorised according to their score from category A (most fit) to category E (least fit), with participants in categories D and E defined as having low fitness. It was found that for boys, accumulating more than 80.7 min/day of MVPA may reduce the probability of low fitness (odds ratio (ORs) [95% confidence interval (CI)] = 0.17 [0.06-0.47], p = .001). For girls, accumulating only 8.4 min of VPA could reduce the likelihood of exhibiting low fitness (ORs [95% CI] = 0.23 [0.05-0.89], p = .032). These results reveal that there are sex-specific differences in the relationship between PA and physical fitness in adolescents, suggesting that sex-specific PA recommendation may be needed to improve physical fitness in adolescents.
Collapse
Affiliation(s)
- T Kidokoro
- a The United Graduate School of Education, Division of Health and Sport Education , Tokyo Gakugei University , 4-1-1 Nukuikitamachi, Koganei , Tokyo 184-8501 , Japan
| | - H Tanaka
- b Faculty of Education and Human Science , Yokohama National University , 79-1 Tokiwadai, Hotogaya, Yokohama , Kanagawa 240-8501 , Japan
| | - K Naoi
- c Koganei Junior High School , Tokyo Gakugei University , 4-1-1 Nukuikitamachi, Koganei , Tokyo 184-8501 , Japan
| | - K Ueno
- c Koganei Junior High School , Tokyo Gakugei University , 4-1-1 Nukuikitamachi, Koganei , Tokyo 184-8501 , Japan
| | - T Yanaoka
- d Department of Health and Sports Sciences , Tokyo Gakugei University , 4-1-1 Nukuikitamachi, Koganei , Tokyo 184-8501 , Japan
| | - K Kashiwabara
- d Department of Health and Sports Sciences , Tokyo Gakugei University , 4-1-1 Nukuikitamachi, Koganei , Tokyo 184-8501 , Japan
| | - M Miyashita
- d Department of Health and Sports Sciences , Tokyo Gakugei University , 4-1-1 Nukuikitamachi, Koganei , Tokyo 184-8501 , Japan
| |
Collapse
|
8
|
Iwama E, Kawabata N, Nishio N, Kisu K, Miyamoto J, Naoi W, Rozier P, Simon P, Naoi K. Enhanced Electrochemical Performance of Ultracentrifugation-Derived nc-Li3VO4/MWCNT Composites for Hybrid Supercapacitors. ACS Nano 2016; 10:5398-404. [PMID: 27158830 DOI: 10.1021/acsnano.6b01617] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Nanocrystalline Li3VO4 dispersed within multiwalled carbon nanotubes (MWCNTs) was prepared using an ultracentrifugation (uc) process and electrochemically characterized in Li-containing electrolyte. When charged and discharged down to 0.1 V vs Li, the material reached 330 mAh g(-1) (per composite) at an average voltage of about 1.0 V vs Li, with more than 50% capacity retention at a high current density of 20 A g(-1). This current corresponds to a nearly 500C rate (7.2 s) for a porous carbon electrode normally used in electric double-layer capacitor devices (1C = 40 mA g(-1) per activated carbon). The irreversible structure transformation during the first lithiation, assimilated as an activation process, was elucidated by careful investigation of in operando X-ray diffraction and X-ray absorption fine structure measurements. The activation process switches the reaction mechanism from a slow "two-phase" to a fast "solid-solution" in a limited voltage range (2.5-0.76 V vs Li), still keeping the capacity as high as 115 mAh g(-1) (per composite). The uc-Li3VO4 composite operated in this potential range after the activation process allows fast Li(+) intercalation/deintercalation with a small voltage hysteresis, leading to higher energy efficiency. It offers a promising alternative to replace high-rate Li4Ti5O12 electrodes in hybrid supercapacitor applications.
Collapse
Affiliation(s)
| | | | | | | | | | - Wako Naoi
- Division of Art and Innovative Technologies, K&W Inc. , 1-3-16-901 Higashi, Kunitachi, Tokyo 186-0002, Japan
| | - Patrick Rozier
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS , 118 route de Narbonne, 31062 Toulouse cedex 9, France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), FR CNRS 3459, France
| | - Patrice Simon
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS , 118 route de Narbonne, 31062 Toulouse cedex 9, France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), FR CNRS 3459, France
| | - Katsuhiko Naoi
- Division of Art and Innovative Technologies, K&W Inc. , 1-3-16-901 Higashi, Kunitachi, Tokyo 186-0002, Japan
| |
Collapse
|
9
|
Yonekura D, Iwama E, Ota N, Muramatsu M, Saito M, Orikasa Y, Naoi W, Naoi K. Progress of the conversion reaction of Mn3O4 particles as a function of the depth of discharge. Phys Chem Chem Phys 2015; 16:6027-32. [PMID: 24554035 DOI: 10.1039/c4cp00334a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A comprehensive investigation of the morphological and interfacial changes of Mn3O4 particles at different lithiation stages was performed in order to improve our understanding of the mechanism of the irreversible conversion reaction of Mn3O4. The micronization of Mn3O4 into a Mn-Li2O nanocomposite microstructure and the formation of a solid electrolyte interphase (SEI) on the Mn3O4 surface were carefully observed and characterized by combining high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and in situ X-ray absorption fine structure (XAFS) measurements. Accumulation of a thin SEI film of 2-5 nm thickness on the surfaces of the Mn3O4 particles due to their catalytic decomposition was observed at a depth of discharge (DOD) of 0%. As the DOD increases from 25% to 75%, the SEI layer composed of Li2CO3 and LiF continues to grow to 20-30 nm, and Li2O nanoparticles are clearly observed. At 100% DOD, the Mn-Li2O particles with diameters of 2-5 nm become totally encapsulated within a huge organic-inorganic coating structure, while the overall starting shape of the particles remains.
Collapse
Affiliation(s)
- Daisuke Yonekura
- Department of Applied Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan.
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Abstract
To meet growing demands for electric automotive and regenerative energy storage applications, researchers all over the world have sought to increase the energy density of electrochemical capacitors. Hybridizing battery-capacitor electrodes can overcome the energy density limitation of the conventional electrochemical capacitors because they employ both the system of a battery-like (redox) and a capacitor-like (double-layer) electrode, producing a larger working voltage and capacitance. However, to balance such asymmetric systems, the rates for the redox portion must be substantially increased to the levels of double-layer process, which presents a significant challenge. An in situ material processing technology called "ultracentrifuging (UC) treatment" has been used to prepare a novel ultrafast Li4Ti5O12 (LTO) nanocrystal electrode for capacitive energy storage. This Account describes an extremely high-performance supercapacitor that utilizes highly optimized "nano-nano-LTO/carbon composites" prepared via the UC treatment. The UC-treated LTO nanocrystals are grown as either nanosheets or nanoparticles, and both have hyperlinks to two types of nanocarbons: carbon nanofibers and supergrowth (single-walled) carbon nanotubes. The spinel structured LTO has been prepared with two types of hyperdispersed carbons. The UC treatment at 75 000G stoichiometrically accelerates the in situ sol-gel reaction (hydrolysis followed by polycondensation) and further forms, anchors, and grafts the nanoscale LTO precursors onto the carbon matrices. The mechanochemical sol-gel reaction is followed by a short heat-treatment process in vacuo. This immediate treatment with heat is very important for achieving optimal crystallization, inhibiting oxidative decomposition of carbon matrices, and suppressing agglomeration. Such nanocrystal composites can store and deliver energy at the highest rate attained to this date. The charge-discharge profiles indicate a very high sustained capacity of 80 mAh g(-1) at an extremely high rate of 1200 C. Using this ultrafast material, we assembled a hybrid device called a "nanohybrid capacitor" that consists of a Faradaic Li-intercalating LTO electrode and a non-Faradaic AC electrode employing an anion (typically BF4(-)) adsorption-desorption process. The "nanohybrid capacitor" cell has demonstrated remarkable energy, power, and cycleability performance as an electrochemical capacitor electrode. It also exhibits the same ion adsorption-desorption process rates as those of standard activated carbon electrodes in electrochemical capacitors. The new-generation "nanohybrid capacitor" technology produced more than triple the energy density of a conventional electrochemical capacitor. Moreover, the synthetic simplicity of the high-performance nanostructures makes it possible to scale them up for large-volume material production and further applications in many other electrochemical energy storage devices.
Collapse
Affiliation(s)
- Katsuhiko Naoi
- Institute of Symbiotic Science & Technology, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan
- Divison of Art and Innovative Technology, K & W Inc, 1-3-16-901 Higashi, Kunitachi, Tokyo 186-0002, Japan
| | - Wako Naoi
- Divison of Art and Innovative Technology, K & W Inc, 1-3-16-901 Higashi, Kunitachi, Tokyo 186-0002, Japan
| | - Shintaro Aoyagi
- Institute of Symbiotic Science & Technology, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan
| | - Jun-ichi Miyamoto
- Institute of Symbiotic Science & Technology, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan
| | - Takeo Kamino
- Institute of Symbiotic Science & Technology, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8558, Japan
- Advanced Microscope Systems Design Department, Hitachi High-Technologies Corp., 882 Ichige, Hitachinaka, Ibaraki 312-8504, Japan
| |
Collapse
|
11
|
Naoi K, Kawase KI, Mori M, Komiyama M. A New Polymer Cathode-Conducting Polymer Interconnected With Sulfur-Sulfur Bonds: Poly(2,2'-Dithiodianiline). ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-496-309] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractPoly(2, 2'-Dithiodianiline)(Poly(DTDA)), a conducting polymer having disulfide bond in it, has been proposed as a new class of high energy storage material. DTDA has one S-S bond interconnected between two moieties of anilines. The structure of the poly(DTDA) was similar to that of polyaniline in addition that the S-S bond is preserved after electropolymerization of DTDA. The poly(DTDA) has some advantages because of its high theoretical energy density, faster kinetics and higher electrical conductivity than other organosulfur cathodes
Collapse
|
12
|
Kashiwazaki N, Seita Y, Naoi K, Takizawa A, Kuramoto T, Serikawa T. 12 GENERATION OF RAT OFFSPRING DERIVED FROM CRYOPRESERVED SPERMATOZOA IN JAPANESE NATIONAL BIORESOURCES. Reprod Fertil Dev 2007. [DOI: 10.1071/rdv19n1ab12] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The purpose of the National BioResource project is to facilitate the availability of genetically and phenotypically standardized rat strains for life sciences. The BioResource is available to scientists worldwide. To bank genetic resources efficiently in the rat, cryopreservation of both sperm and embryos is a very important technology. The objective of the present study was to confirm the ability of banked and transported rat spermatozoa to fertilize oocytes through intrauterine insemination and for the embryos to develop to term, with the ultimate aim of developing a system for banking rat genetic resources. The epidydimal spermatozoa from the KLM rat, whose body size is small because the Prkg2 gene is partially defective, were frozen with egg yolk medium supplemented with 0.7% Equex Stm (Nakatsukasa et al. 2001 Reproduction 122, 463–467) and banked in the Institute of Laboratory Animals, Kyoto University. The cryopreserved sperm in 0.25-mL straws were transported to the laboratory at Azabu University, Kanagawa. Two straws from different males were thawed in a 37�C water bath for 15 s. Thawed semen was diluted with 1.0 mL of mR1ECM (Miyoshi et al. 1997 Biol. Reprod. 56, 180–185) with 0.4% (w/v) bovine serum albumin (BSA, fraction V; Sigma-Aldrich Japan K.K., Tokyo, Japan) at 37�C and then incubated at 37�C in 5% CO2 in humidified air until insemination. The percentage of motile spermatozoa was assessed visibly and determined by direct observation at 37�C under a light microscope at 100�. The thawed semen (50 �L, 3–4 � 105 sperm cells) was then inseminated into the top of both uterine horns of recipient females that were mated with a vasectomized male. The post-thaw motility of frozen spermatozoa was 10%. Seven of 15 inseminated females became pregnant and 13 live pups were born. It is thought that the low number of pups born in spite of the relatively high pregnancy rate was caused by sperm damage during the freezing and thawing procedure. The results of the present study show that rat spermatozoa cryopreserved in the BioResource have the ability to revive genetic resources through intrauterine insemination.
Collapse
|
13
|
Ogihara N, Igarashi Y, Kamakura A, Naoi K, Kusachi Y, Utsugi K. Disordered carbon negative electrode for electrochemical capacitors and high-rate batteries. Electrochim Acta 2006. [DOI: 10.1016/j.electacta.2006.01.082] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
14
|
Jang JH, Machida K, Kim Y, Naoi K. Electrophoretic deposition (EPD) of hydrous ruthenium oxides with PTFE and their supercapacitor performances. Electrochim Acta 2006. [DOI: 10.1016/j.electacta.2006.01.075] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
15
|
|
16
|
Furutani I, Watanabe Y, Prieto R, Masukawa M, Suzuki K, Naoi K, Thitamadee S, Shikanai T, Hashimoto T. The SPIRAL genes are required for directional control of cell elongation in Aarabidopsis thaliana. Development 2000; 127:4443-53. [PMID: 11003843 DOI: 10.1242/dev.127.20.4443] [Citation(s) in RCA: 154] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Cells at the elongation zone expand longitudinally to form the straight central axis of plant stems, hypocotyls and roots, and transverse cortical microtubule arrays are generally recognized to be important for the anisotropic growth. Recessive mutations in either of two Arabidopsis thaliana SPIRAL loci, SPR1 or SPR2, reduce anisotropic growth of endodermal and cortical cells in roots and etiolated hypocotyls, and induce right-handed helical growth in epidermal cell files of these organs. spr2 mutants additionally show right-handed twisting in petioles and petals. The spr1spr2 double mutant's phenotype is synergistic, suggesting that SPR1 and SPR2 act on a similar process but in separate pathways in controlling cell elongation. Interestingly, addition of a low dose of either of the microtubule-interacting drugs propyzamide or taxol in the agar medium was found to reduce anisotropic expansion of endodermal and cortical cells at the root elongation zone of wild-type seedlings, resulting in left-handed helical growth. In both spiral mutants, exogenous application of these drugs reverted the direction of the epidermal helix, in a dose-dependent manner, from right-handed to left-handed; propyzamide at 1 microM and taxol at 0.2-0.3 microM effectively suppressed the cell elongation defects of spiral seedlings. The spr1 phenotype is more pronounced at low temperatures and is nearly suppressed at high temperatures. Cortical microtubules in elongating epidermal cells of spr1 roots were arranged in left-handed helical arrays, whereas the highly isotropic cortical cells of etiolated spr1 hypocotyls showed microtubule arrays with irregular orientations. We propose that a microtubule-dependent process and SPR1/SPR2 act antagonistically to control directional cell elongation by preventing elongating cells from potential twisting. Our model may have implicit bearing on the circumnutation mechanism.
Collapse
Affiliation(s)
- I Furutani
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Takayama, Ikoma 630-0101, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Naoi K, Takeda M, Kanno H, Sakakura M, Shimada A. Simultaneous electrochemical formation of Al2O3/polypyrrole layers (I): effect of electrolyte anion in formation process. Electrochim Acta 2000. [DOI: 10.1016/s0013-4686(00)00423-0] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
18
|
|
19
|
|
20
|
Oana Y, Irie H, Uchino A, Utsugi Y, Naoi K, Miura S, Matsuda H. Clinico-electroencephalographical study on temporal lobe epilepsy. Jpn J Psychiatry Neurol 1991; 45:482-4. [PMID: 1762254 DOI: 10.1111/j.1440-1819.1991.tb02527.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Y Oana
- Department of Neuropsychiatry, Tokyo Medical College, Japan
| | | | | | | | | | | | | |
Collapse
|
21
|
Naoi K, Hirabayashi T, Tsubota I, Osaka T. Application of Pyrrole/N-Methylpyrrole Composite Polymer to Cathode Active Material of Lithium Secondary Battery. BCSJ 1987. [DOI: 10.1246/bcsj.60.1213] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
22
|
Naoi K, Ishijima A, Osaka T. An improvement of battery performance of lithium batteries assembled with a polypyrrole cathode formed electrochemically with the aid of a nitrile rubber insulating film. ACTA ACUST UNITED AC 1987. [DOI: 10.1016/0022-0728(87)85074-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
23
|
Osaka T, Naoi K, Ogano S, Nakamura S. Dependence of Film Thickness on Electrochemical Kinetics of Polypyrrole and on Lithium/Polypyrrole Battery. CHEM LETT 1986. [DOI: 10.1246/cl.1986.1687] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
24
|
Osaka T, Naoi K, Hirabayashi T, Nakamura S. Electrocatalytic Oxygen Reduction at (Tetrasulfonatophthalocyaninato)cobalt Incorporated Polypyrrole Film Electrode. BCSJ 1986. [DOI: 10.1246/bcsj.59.2717] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
25
|
Osaka T, Naoi K. Application of On-line Impedance Measurement Using Fast Fourier Transform to Electrochemical Systems. BCSJ 1982. [DOI: 10.1246/bcsj.55.36] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|