Sulfolane-Graphite Incompatibility and Its Mitigation in Li-ion Batteries  

作　　者：Qinfeng Zheng Guanjie Li Xiongwen Zheng Lidan Xing Kang Xu Weishan Li 

机构地区：[1]Engineering Research Center of MTEES(Ministry of Education),Research Center of BMET(Guangdong Province),Engineering Lab.of OFMHEB(Guangdong Province),Key Lab.of ETESPG(GHEI),and Innovative Platform for ITBMD(Guangzhou Municipality),School of Chemistry and Environment,South China Normal University,Guangzhou 510006,China [2]Battery Science Branch,Sensor and Electron Devices Directorate,U.S.Army Research Laboratory,Adelphi,MD 20783,USA

出　　处：《Energy & Environmental Materials》2022年第3期906-911,共6页能源与环境材料（英文）

基　　金：supported by the National Natural Science Foundation of China(21972049);the Guangdong Program for Distinguished Young Scholar(2017B030306013);the Science and Technology Planning Project of Guangdong Province(2017B090901020)。

摘　　要：The non-flammability and high oxidation stability of sulfolane(SL)make it an excellent electrolyte candidate for lithium-ion batteries(LIBs).However,its incompatibility with graphitic anode prevents the realization of these advantages.To understand how this incompatibility arises on molecular level so that it can be suppressed,we combined theoretical calculation and experimental characterization and reveal that the primary Li^(+) solvation sheath in SL is depleted of fluorine source.Upon reduction,SL in such fluorine-poor solvation sheath generates insoluble dimer with poor electronic insulation,hence leading to slow but sustained parasitic reactions.When fluorine content in Li^(+)-SL solvation sheath is increased via salt concentration,a high stability LiF-rich interphase on graphite can be formed.This new understanding of the failure mechanism of graphite in SL-based electrolyte is of great significance in unlocking many possible electrolyte solvent candidates for the high-voltage cathode materials for next-generation LIBs.

关 键 词：graphite anode interphasial incompatibility mechanism lithium-ion batteries SULFOLANE 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工]