1
|
Wang LB, Hu HS, Lin W, Xu QH, Gong JD, Chai WK, Shen CQ. Electrochemically Inert Li 2MnO 3: The Key to Improving the Cycling Stability of Li-Rich Manganese Oxide Used in Lithium-Ion Batteries. MATERIALS (BASEL, SWITZERLAND) 2021; 14:4751. [PMID: 34443273 PMCID: PMC8401014 DOI: 10.3390/ma14164751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 08/19/2021] [Accepted: 08/21/2021] [Indexed: 11/16/2022]
Abstract
Lithium-rich manganese oxide is a promising candidate for the next-generation cathode material of lithium-ion batteries because of its low cost and high specific capacity. Herein, a series of xLi2MnO3·(1 - x)LiMnO2 nanocomposites were designed via an ingenious one-step dynamic hydrothermal route. A high concentration of alkaline solution, intense hydrothermal conditions, and stirring were used to obtain nanoparticles with a large surface area and uniform dispersity. The experimental results demonstrate that 0.072Li2MnO3·0.928LiMnO2 nanoparticles exhibit a desirable electrochemical performance and deliver a high capacity of 196.4 mAh g-1 at 0.1 C. This capacity was maintained at 190.5 mAh g-1 with a retention rate of 97.0% by the 50th cycle, which demonstrates the excellent cycling stability. Furthermore, XRD characterization of the cycled electrode indicates that the Li2MnO3 phase of the composite is inert, even under a high potential (4.8 V), which is in contrast with most previous reports of lithium-rich materials. The inertness of Li2MnO3 is attributed to its high crystallinity and few structural defects, which make it difficult to activate. Hence, the final products demonstrate a favorable electrochemical performance with appropriate proportions of two phases in the composite, as high contents of inert Li2MnO3 lower the capacity, while a sufficient structural stability cannot be achieved with low contents. The findings indicate that controlling the composition through a dynamic hydrothermal route is an effective strategy for developing a Mn-based cathode material for lithium-ion batteries.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Chao-Qi Shen
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; (L.-B.W.); (H.-S.H.); (W.L.); (Q.-H.X.); (J.-D.G.); (W.-K.C.)
| |
Collapse
|
2
|
Xiang J, Zhang P, Lv S, Ma Y, Zhao Q, Sui Y, Ye Y, Qin C. Spinel LiMn 2O 4 nanoparticles fabricated by the flexible soft template/Pichini method as cathode materials for aqueous lithium-ion capacitors with high energy and power density. RSC Adv 2021; 11:14891-14898. [PMID: 35424028 PMCID: PMC8698631 DOI: 10.1039/d0ra07823a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Accepted: 04/14/2021] [Indexed: 02/06/2023] Open
Abstract
Spinel LiMn2O4 (LMO) with a three-dimensional structure has become one of the cathode materials that has gained the most interest due to its safety, low price and abundant resources. However, the lithium ion transmission is limited by large particle size and particle agglomeration of LMO. Thus, reducing the particle size and agglomeration of LMO can effectively improve its lithium ion transmission. Here, we synthesized a LMO cathode material with a nanoscale crystal size using the flexible expanded graphite (EG) soft template and Pichini method. EG-controlled particle size and particle agglomeration of LMO is conducive to charge transfer and diffusion of lithium ions between LMO and the electrolyte, meanwhile, there are more redox sites on the nanosized LMO particles, which makes the redox reaction of LMO more thorough during the charge and discharge process, resulting in high capacitance performance. In order to obtain the considerably required lithium-ion capacitors (LICs) with high energy density and power density, we assembled aqueous LMO//activated carbon (AC) LICs with 5 M LiNO3 as the aqueous electrolytes, which are environmentally friendly, safe, low cost and have higher electrical conductivity than organic electrolytes. The optimal LIC has an energy density of 32.63 W h kg-1 at a power density of 500 W kg-1 and an energy density of 8.06 W h kg-1 at a power density of 10 000 W kg-1, which is higher than most of the LMO-based LICs in previous reports. After 2000 cycles, the specific capacitance retention rate was 75.9% at a current density of 3 A g-1. Therefore, our aqueous LMO//AC LICs synthesized by the soft template/Pichini method have wide prospects and are suitable for low-cost, high-safety and high-power applications.
Collapse
Affiliation(s)
- Junyu Xiang
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, College of Heilongjiang Province Harbin 150080 PR China
- School of Chemistry and Materials Science, Heilongjiang University Harbin 150080 China
| | - Pengxue Zhang
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, College of Heilongjiang Province Harbin 150080 PR China
- School of Chemistry and Materials Science, Heilongjiang University Harbin 150080 China
| | - Shixian Lv
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, College of Heilongjiang Province Harbin 150080 PR China
- School of Chemistry and Materials Science, Heilongjiang University Harbin 150080 China
| | - Yongjun Ma
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, College of Heilongjiang Province Harbin 150080 PR China
- School of Chemistry and Materials Science, Heilongjiang University Harbin 150080 China
| | - Qi Zhao
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, College of Heilongjiang Province Harbin 150080 PR China
- School of Chemistry and Materials Science, Heilongjiang University Harbin 150080 China
| | - Yan Sui
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, College of Heilongjiang Province Harbin 150080 PR China
- School of Chemistry and Materials Science, Heilongjiang University Harbin 150080 China
| | - Yuncheng Ye
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, College of Heilongjiang Province Harbin 150080 PR China
- School of Chemistry and Materials Science, Heilongjiang University Harbin 150080 China
| | - Chuanli Qin
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, College of Heilongjiang Province Harbin 150080 PR China
- School of Chemistry and Materials Science, Heilongjiang University Harbin 150080 China
| |
Collapse
|
3
|
Dinh TT, Huynh TTK, Le LTM, Truong TTT, Nguyen OH, Tran KTT, Tran MV, Tran PH, Kaveevivitchai W, Le PML. Deep Eutectic Solvent Based on Lithium Bis[(trifluoromethyl)sulfonyl] Imide (LiTFSI) and 2,2,2-Trifluoroacetamide (TFA) as a Promising Electrolyte for a High Voltage Lithium-Ion Battery with a LiMn 2O 4 Cathode. ACS OMEGA 2020; 5:23843-23853. [PMID: 32984704 PMCID: PMC7513330 DOI: 10.1021/acsomega.0c03099] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Accepted: 08/24/2020] [Indexed: 06/11/2023]
Abstract
To design safe and electrochemically stable electrolytes for lithium-ion batteries, this study describes the synthesis and the utilization of new deep eutectic solvents (DESs) based on the mixture of 2,2,2-trifluoroacetamide (TFA) with a lithium salt (LiTFSI, lithium bis[(trifluoromethane)sulfonyl]imide). These prepared DESs were characterized in terms of thermal properties, ionic conductivity, viscosity, and electrochemical properties. Based on the appearance of the product and DSC measurements, it appears that this system is liquid at room temperature for LiTFSI mole fraction ranging from 0.25 to 0.5. At χLiTFSI = 0.25, DESs exhibited favorable electrolyte properties, such as thermal stability (up to 148 °C), relatively low viscosity (42.2 mPa.s at 30 °C), high ionic conductivity (1.5 mS.cm-1 at 30 °C), and quite large electrochemical stability window up to 4.9-5.3 V. With these interesting properties, selected DES was diluted with slight amount of ethylene carbonate (EC). Different amounts of EC (x = 0-30 %wt) were used to form hybrid electrolytes for battery testing with high voltage LiMn2O4 cathode and Li anode. The addition of the EC solvent into DES expectedly aims at enhancing the battery cycling performance at room temperature due to reducing the viscosity. Preliminary results tests clearly show that LiTFSI-based DES can be successfully introduced as an electrolyte in the lithium-ion batteries cell with a LiMn2O4 cathode material. Among all of the studied electrolytes, DES (LiTFSI: TFA = 4:1 + 10 %wt EC) is the most promising. The EC-based system exhibited a good specific capacity of 102 mAh.g-1 at C/10 with the theoretical capacity of 148 mAh.g-1 and a good cycling behavior maintaining at 84% after 50 cycles.
Collapse
Affiliation(s)
- Thai T.
A. Dinh
- Applied
Physical Chemistry Laboratory (APCLAB), University of Science, Ho Chi
Minh City 700000, Viet
Nam
- Viet
Nam National University−Ho Chi Minh (VNU HCM), Ho Chi Minh City 70000, Viet Nam
| | - Tuyen T. K. Huynh
- Applied
Physical Chemistry Laboratory (APCLAB), University of Science, Ho Chi
Minh City 700000, Viet
Nam
- Viet
Nam National University−Ho Chi Minh (VNU HCM), Ho Chi Minh City 70000, Viet Nam
| | - Linh T. M. Le
- Applied
Physical Chemistry Laboratory (APCLAB), University of Science, Ho Chi
Minh City 700000, Viet
Nam
- Viet
Nam National University−Ho Chi Minh (VNU HCM), Ho Chi Minh City 70000, Viet Nam
| | - Tuyen T. T. Truong
- Department
of Physical Chemistry, Faculty of Chemistry, University of Science, Ho Chi
Minh City 721337, Viet
Nam
- Viet
Nam National University−Ho Chi Minh (VNU HCM), Ho Chi Minh City 70000, Viet Nam
| | - Oanh H. Nguyen
- Department
of Physical Chemistry, Faculty of Chemistry, University of Science, Ho Chi
Minh City 721337, Viet
Nam
- Viet
Nam National University−Ho Chi Minh (VNU HCM), Ho Chi Minh City 70000, Viet Nam
| | - Kieu T. T. Tran
- Department
of Physical Chemistry, Faculty of Chemistry, University of Science, Ho Chi
Minh City 721337, Viet
Nam
- Viet
Nam National University−Ho Chi Minh (VNU HCM), Ho Chi Minh City 70000, Viet Nam
| | - Man V. Tran
- Applied
Physical Chemistry Laboratory (APCLAB), University of Science, Ho Chi
Minh City 700000, Viet
Nam
- Department
of Physical Chemistry, Faculty of Chemistry, University of Science, Ho Chi
Minh City 721337, Viet
Nam
- Viet
Nam National University−Ho Chi Minh (VNU HCM), Ho Chi Minh City 70000, Viet Nam
| | - Phuong Hoang Tran
- Department
of Organic Chemistry, Faculty of Chemistry, University of Science, Ho Chi
Minh City 721337, Viet
Nam
- Viet
Nam National University−Ho Chi Minh (VNU HCM), Ho Chi Minh City 70000, Viet Nam
| | - Watchareeya Kaveevivitchai
- Department
of Chemical Engineering, National Cheng
Kung University, Tainan City 701, Taiwan
- Hierarchical
Green-Energy Materials Research Center, National Cheng Kung University, Tainan City 701, Taiwan
| | - Phung M. L. Le
- Applied
Physical Chemistry Laboratory (APCLAB), University of Science, Ho Chi
Minh City 700000, Viet
Nam
- Department
of Physical Chemistry, Faculty of Chemistry, University of Science, Ho Chi
Minh City 721337, Viet
Nam
- Viet
Nam National University−Ho Chi Minh (VNU HCM), Ho Chi Minh City 70000, Viet Nam
| |
Collapse
|
5
|
Shen C, Xu H, Liu L, Hu H, Chen S, Su L, Wang L. Facile One-Step Dynamic Hydrothermal Synthesis of Spinel LiMn 2O 4/Carbon Nanotubes Composite as Cathode Material for Lithium-Ion Batteries. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E4123. [PMID: 31835409 PMCID: PMC6947239 DOI: 10.3390/ma12244123] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/19/2019] [Accepted: 11/28/2019] [Indexed: 11/25/2022]
Abstract
Nano-sized spinel LiMn2O4/carbon nanotubes (LMO/CNTs) composite is facilely synthesized via a one-step dynamic hydrothermal approach. The characterizations and electrochemical measurements reveal that LiMn2O4 particles with narrow size distribution are well dispersed with CNTs in the composite. The LMO/CNTs nanocomposite with 5 wt % CNTs displays a high specific discharge capacity of 114 mAh g-1 at 1C rate, and the retention rate after 180 cycles at room temperature reaches 94.5% in the potential window of 3.3 to 4.3 V vs. Li/Li+. Furthermore, the electrochemical performance of the composite with 5 wt % CNTs at elevated temperature (55 °C) is also impressive, 90% discharging capacity could be maintained after 100 cycles at 1C. Such excellent electrochemical performance of the final product is attributed to the content of CNTs added in the hydrothermal process and small particle size inherited from pretreated MnO2 precursor.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Lianbang Wang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; (C.S.); (H.X.); (L.L.); (H.H.); (S.C.); (L.S.)
| |
Collapse
|
6
|
Yuan M, Li Y, Chen Q, Chen C, Liu X, Zeng W, Wang R, Xiao S. Surfactant-assisted hydrothermal synthesis of V2O5 coated LiNi1/3Co1/3Mn1/3O2 with ideal electrochemical performance. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134822] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|