Zwitterionic Matrix with Highly Delocalized Anionic Structure as an Efficient Lithium Ion Conductor  

作　　者：Shuaishuai Yan Yang Lu Fengxiang Liu Yingchun Xia Qiao Li Kai Liu 

机构地区：[1]State Key Laboratory of Chemical Engineering,Department of Chemical Engineering,Tsinghua University,Beijing 100084

出　　处：《CCS Chemistry》2023年第7期1612-1622,共11页中国化学会会刊（英文）

基　　金：We gratefully acknowledge support by the National Science Foundation of China(grant no.22071133);the Tsinghua University-China Petrochemical Corporation Joint Institute for Green Chemical Engineering(grant no.421120);Tsinghua-Foshan Innovation Special Fund(TFISF)(grant no.2020THFS0130);Tsinghua University Initiative Scientific Research Program(K.L.).

摘　　要：The leakage and volatilization of liquid electrolytes raise potential safety risks in the development of electrochemical energy storage devices with high energy density.Herein,novel solid-state zwitterionic materials containing sulfonyl imide as a highly delocalized anionic structure were synthesized for highly targeted lithium ion conducting matrices.The influences of the molecular structure characteristics on thermal behavior and electrochemical property were investigated comprehensively.Due to the weak Coulomb interaction between the sulfonyl imide moiety and cationic species,the rationally designed zwitterionic electrolytes showed a high conductivity of 0.44 mS cm^(-1).And the obtained high lithium ion transference number of 0.43 is four times higher than that of the widely employed sulfonate analogues.Additionally,excellent cycling stability of the lithium plating/stripping process and super resistance to electrochemical oxidation(up to 5.5 V)were observed.This molecular engineering strategy for lithium ion conductor advances new possibilities for developing solvent-free and non-migrating electrolyte matrix materials for lithium metal batteries.

关 键 词：ZWITTERION ion conductor energy storage ELECTROLYTE lithium battery 

分 类 号：O62[理学—有机化学]