Open AccessSolid Gel Electrolytes with Highly Concentrated Liquid Electrolyte in Polymer Networks and Their Physical and Electrochemical Properties and Application to Sodium Secondary Batteries
Author(s) -
Yuji Yokomaku,
Koji Hiraoka,
Kohei Inaba,
Shiro Seki
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac64c8
Subject(s) - electrolyte , sulfolane , electrochemistry , electrode , polymer , materials science , inorganic chemistry , ionic conductivity , polyacrylonitrile , chemical engineering , chemistry , organic chemistry , composite material , solvent , engineering
Gel polymer electrolytes consisting of sulfolane (SL)-NaN(SO 2 CF 3 ) 2 liquid electrolyte and a polyether-based host polymer were prepared, and their physicochemical and electrochemical properties were investigated. The prepared gel electrolytes generally exhibited high thermal stability regardless of the NaN(SO 2 CF 3 ) 2 concentrations. The glass transition temperature decreased with the NaN(SO 2 CF 3 ) 2 concentration owing to the strong interaction between SL and Na + . The ionic conductivities of all gel polymer electrolytes were higher than 10 −4 S cm −1 at 303.15 K as a result of the plasticizer effect of SL. Although a relatively large interfacial resistance of the electrolyte/Na metal electrode was observed owing to the high reactivity of the SL-NaN(SO 2 CF 3 ) 2 electrolyte, the fabricated [Na metal negative electrode∣gel polymer electrolyte∣sulfur-modified polyacrylonitrile positive electrode] cell, i.e., the Na-S battery, achieved reversible charge-discharge operation at 333 K and demonstrated its potential to serve as an electric power storage system capable of low-temperature operation.