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Title: Ionic conduction mechanisms of polyvinylidenefluoride-hexafluoropropylene type polymer electrolytes with LiN(CF{sub 3}SO{sub 2}){sub 2}

Abstract

The ionic conductivity and self-diffusion coefficient of gel electrolyte composed of the lithium salt of LiN(CF{sub 3}SO{sub 2}){sub 2} dissolved in ethylene carbonate/diethylcarbonate (2/3) and the polyvinylidenefluoride-hexafluoropropylene copolymer have been measured to understand the ionic conduction properties and the ionic condition in the gel electrolytes by changing the mixing ratio of polymer to solution. The conductivity and the self-diffusion coefficient increased with an increase in the solution ratio in the gel electrolytes. The change in the diffusion coefficient is due to the change in steric hindrance and the solution viscosity caused by the interaction between the dissociated ions and/or ion pairs and the surrounding polymer. The conductivity change from 50 to 80 wt % of solution fraction in the gel electrolyte reached to three orders of magnitude. In that range, the diffusion coefficient which is associated with the mobility from the Nernst-Einstein equation changed about one order of magnitude. Therefore, a two-order difference between the conductivity and the diffusion coefficient changes is ascribed to the change in carrier concentration. The effective carrier concentration should be affected by the interaction between the electrolyte solution and the polymer in the gel. It is possible that the polymer chains act on the electrolytemore » solution to influence the dissociation of the salt and solvate the dissociated ions, resulting in the reduction of carrier content.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Ministry of International Trade and Industry, Ikeda, Osaka (JP)
OSTI Identifier:
20080557
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; IONIC CONDUCTIVITY; SELF-DIFFUSION; LITHIUM COMPOUNDS; IMIDES; ORGANIC FLUORINE COMPOUNDS; ORGANIC SULFUR COMPOUNDS; METAL-NONMETAL BATTERIES; ELECTROLYTES

Citation Formats

Saito, Yuria, Capiglia, Claudio, Yamamoto, Hitoshi, and Mustarelli, P. Ionic conduction mechanisms of polyvinylidenefluoride-hexafluoropropylene type polymer electrolytes with LiN(CF{sub 3}SO{sub 2}){sub 2}. United States: N. p., 2000. Web. doi:10.1149/1.1393411.
Saito, Yuria, Capiglia, Claudio, Yamamoto, Hitoshi, & Mustarelli, P. Ionic conduction mechanisms of polyvinylidenefluoride-hexafluoropropylene type polymer electrolytes with LiN(CF{sub 3}SO{sub 2}){sub 2}. United States. doi:10.1149/1.1393411.
Saito, Yuria, Capiglia, Claudio, Yamamoto, Hitoshi, and Mustarelli, P. Mon . "Ionic conduction mechanisms of polyvinylidenefluoride-hexafluoropropylene type polymer electrolytes with LiN(CF{sub 3}SO{sub 2}){sub 2}". United States. doi:10.1149/1.1393411.
@article{osti_20080557,
title = {Ionic conduction mechanisms of polyvinylidenefluoride-hexafluoropropylene type polymer electrolytes with LiN(CF{sub 3}SO{sub 2}){sub 2}},
author = {Saito, Yuria and Capiglia, Claudio and Yamamoto, Hitoshi and Mustarelli, P.},
abstractNote = {The ionic conductivity and self-diffusion coefficient of gel electrolyte composed of the lithium salt of LiN(CF{sub 3}SO{sub 2}){sub 2} dissolved in ethylene carbonate/diethylcarbonate (2/3) and the polyvinylidenefluoride-hexafluoropropylene copolymer have been measured to understand the ionic conduction properties and the ionic condition in the gel electrolytes by changing the mixing ratio of polymer to solution. The conductivity and the self-diffusion coefficient increased with an increase in the solution ratio in the gel electrolytes. The change in the diffusion coefficient is due to the change in steric hindrance and the solution viscosity caused by the interaction between the dissociated ions and/or ion pairs and the surrounding polymer. The conductivity change from 50 to 80 wt % of solution fraction in the gel electrolyte reached to three orders of magnitude. In that range, the diffusion coefficient which is associated with the mobility from the Nernst-Einstein equation changed about one order of magnitude. Therefore, a two-order difference between the conductivity and the diffusion coefficient changes is ascribed to the change in carrier concentration. The effective carrier concentration should be affected by the interaction between the electrolyte solution and the polymer in the gel. It is possible that the polymer chains act on the electrolyte solution to influence the dissociation of the salt and solvate the dissociated ions, resulting in the reduction of carrier content.},
doi = {10.1149/1.1393411},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 5,
volume = 147,
place = {United States},
year = {2000},
month = {5}
}