Block Copolymer Solid Electrolytes Based on Comb-Like Poly(ethylene glycol)Plasticized Poly(ionic liquid)s for Lithium-Ion Batteries  

作　　者：Runtao Zhao Jixing Yang Bin Wang Zhe Ma Li Pan Yuesheng Li 

机构地区：[1]School of Materials Science and Engineering,Tianjin Key Laboratory of Composite and Functional Materials,Tianjin University,Tianjin,300072 China

出　　处：《Chinese Journal of Chemistry》2023年第19期2493-2501,共9页中国化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52130307).

摘　　要：Electrolytes based on poly(ionic liquid)s(PILs)have attracted great attention in the fields of next-generation solid lithium-ion batteries.However,the low ionic conductivity prevents their practical applications.Herein,we report novel solid electrolytes based on block copolymers composed of PILs and comb-like poly(ethylene glycol)(PEG),which were synthesized via ring-opening metathesis polymerization of 3-(2-(bicyclo[2.2.1]hept-5-en-2-yl)ethyl)-1-butyl-1H-imidazol-3-ium bis((trifluoromethyl)sulfonyl)amide and poly(ethylene glycol monomethyl ether)bicyclo[2.2.1]hept-5-ene-2-carboxylate.Comb-like PEG acts as plasticizers in block copolymers dominated by PILs to promote the mobility of PILs segments.Effects of the copolymer composition and length of the comb-like PEG chain on ionic conductivity were investigated.The optimized electrolyte delivers the highest ionic conductivity of 1.5×10^(–5)S·cm^(–1)at 30℃,and robust electrochemical stability up to 4.6 V.A solid-state Li/LiFePO4 cell using the optimized electrolyte demonstrates good cycle performance at 0.2 C with high capacity retention of 92%after 70 cycles at 50℃.

关 键 词：Solid polymer electrolytes Li-ion batteries Polymerized ionic liquids Poly(ethylene glycol) Block copolymers Electrostatic interactions 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.1[理学—物理化学]