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Roohi H, Salehi R. Exploring the electrochemical windows of Triazolium-based [PhMTZ][X1–7] ionic liquids (ILs) at MP2/Aug-cc-pVDZ level of theory by using thermochemical cycle in IL media. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Yuuki T, Konosu Y, Ashizawa M, Iwahashi T, Ouchi Y, Tominaga Y, Ooyabu R, Matsumoto H, Matsumoto H. Ionic Liquid-Based Electrolytes Containing Surface-Functionalized Inorganic Nanofibers for Quasisolid Lithium Batteries. ACS OMEGA 2017; 2:835-841. [PMID: 31457475 PMCID: PMC6641074 DOI: 10.1021/acsomega.6b00480] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 02/23/2017] [Indexed: 05/21/2023]
Abstract
In the present study, surface amino-functionalized silica nanofibers (f-SiO2NFs, average diameter = 400 and 1000 nm) are used as one-dimensional (1-D) fillers of ionic liquid (IL)-based quasisolid electrolytes. On adding f-SiO2NFs to an IL (1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide, EMITFSA) containing lithium bis(trifluoromethanesulfonyl)-amide (LiTFSA), the well-dispersed 1-D nanofillers easily form a three-dimensional network structure in the IL, function as physical cross-linkers, and increase the viscosity of the composites, consequently providing a quasisolid state at a 3.5 wt % fraction of the NFs. Rheological measurements demonstrate that the prepared composites exhibit "gel-like" characteristics at 40-150 °C. All prepared composites show high ionic conductivities, on the order of 10-3 S cm-1, around room temperature. To investigate the additive effect of f-SiO2NFs in the composites, the lithium transference numbers are also evaluated. It is found that thinner NFs enhance the transference numbers of the composites. In addition, quasisolid lithium-ion cells containing the prepared composites demonstrate relatively high rate characteristics and good cycling performance at high temperature (125 °C).
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Affiliation(s)
- Takahiro Yuuki
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yuichi Konosu
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Minoru Ashizawa
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Takashi Iwahashi
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yukio Ouchi
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yoichi Tominaga
- Graduate
School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Rie Ooyabu
- Department
of Energy and Environment, Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science
and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Hajime Matsumoto
- Department
of Energy and Environment, Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science
and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Hidetoshi Matsumoto
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
- E-mail:
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Murakami Y, Himuro Y, Ito T, Morita R, Niimi K, Kiyoyanagi N. Transparent and Nonflammable Ionogel Photon Upconverters and Their Solute Transport Properties. J Phys Chem B 2016; 120:748-55. [PMID: 26752701 DOI: 10.1021/acs.jpcb.5b09880] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Photon upconversion based on triplet-triplet annihilation (TTA-UC) is a technology to convert presently wasted sub-bandgap photons to usable higher-energy photons. In this paper, ionogel TTA-UC samples are first developed by gelatinizing ionic liquids containing triplet-sensitizing and light-emitting molecules using an ionic gelator, resulting in transparent and nonflammable ionogel photon upconverters. The photophysical properties of the ionogel samples are then investigated, and the results suggest that the effect of gelation on the diffusion of the solutes is negligibly small. To further examine this suggestion and acquire fundamental insight into the solute transport properties of the samples, the diffusion of charge-neutral solute species over much longer distances than microscopic interpolymer distances is measured by electrochemical potential-step chronoamperometry. The results reveal that the diffusion of solute species is not affected by gelation within the tested gelator concentration range, supporting our interpretation of the initial results of the photophysical investigations. Overall, our results show that the advantage of nonfluidity can be imparted to ionic-liquid-based photon upconverters without sacrificing molecular diffusion, optical transparency, and nonflammability.
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Affiliation(s)
- Yoichi Murakami
- Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology , 2-12-1-I1-15 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yuki Himuro
- Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology , 2-12-1-I1-15 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Toshiyuki Ito
- Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology , 2-12-1-I1-15 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Ryoutarou Morita
- Nippon Kayaku Co., Ltd. , 3-31-12 Shimo, Kita-ku, Tokyo 115-8588, Japan
| | - Kazuki Niimi
- Nippon Kayaku Co., Ltd. , 3-31-12 Shimo, Kita-ku, Tokyo 115-8588, Japan
| | - Noriko Kiyoyanagi
- Nippon Kayaku Co., Ltd. , 3-31-12 Shimo, Kita-ku, Tokyo 115-8588, Japan
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