Nano-silica-decorated Poly(m-Phenylene Isophthalamide)Separator with Enhanced Mechanical and Electrolyte Wetting Properties for Lithium-Ion Batteries  

作　　者：Jianjie Wang Biao Yuan Fusheng Pan Lina Qiao Jun Guo Cuijia Duan Wei Wu Zan Chen anlei Su 

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [2]CenerTech Tianjin Chemical Research and Design Institute Co.,Ltd,Tianjin 300131,China [3]Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300072,China

出　　处：《Transactions of Tianjin University》2020年第4期256-264,共9页天津大学学报（英文版）

基　　金：supported by National Science and Technology Major Project(No.2016ZX02025-004-006);Science and Technology Project of China National Off shore Oil Corporation(No.CNOOC-KJ 135 ZDXM 35 TJY 009-2017).

摘　　要：Heat-resistant poly(m-phenylene isophthalamide)(PMIA)has attracted considerable attention as a novel separator for application in lithium-ion batteries(LIBs);however,its mechanical strength and electrolyte wettability are not ideal.Herein,a nano-silica-decorated poly(m-phenylene isophthalamide)(PMIA@SiO2)separator was fabricated with SiO2 nanoparticles uniformly attached to the pores and pore walls of the PMIA separator.The as-prepared PMIA@SiO2 separator has good mechanical strength(a 16%improvement compared with pristine PMIA)and wettability toward the electrolyte(the contact angle decreases from 34.0°to 23.1°).The PMIA@SiO2 separator also had a high ionic conductivity(0.75 mS/cm)and low interfacial electric resistance(75Ω).The assembled LiCoO2/PMIA@Si O2-liquid electrolyte/Li cell displays good cycle performance with a capacity retention of 88.1%after 50 cycles.Furthermore,the cycling performance and rate capacity rarely changed after high-temperature treatment.Therefore,the nano-silica-decorated PMIA separator is a potential candidate for application in LIBs with high safety.

关 键 词：Li-ion batteries PMIA@SiO2 Separator Mechanical strength Electrolyte wetting 

分 类 号：TM912[电气工程—电力电子与电力传动]