Outstanding performances of graphite||NMC622 pouch cells enabled by a non-inert diluent

作     者：Qinqin Cai Hao Jia Guanjie Li Zhangyating Xie Xintao Zhou Zekai Ma Lidan Xing Weishan Li Qinqin Cai;Hao Jia;Guanjie Li;Zhangyating Xie;Xintao Zhou;Zekai Ma;Lidan Xing;Weishan Li

作者机构：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 ChemistrySouth China Normal UniversityGuangzhou 510006GuangdongChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第81卷第6期

页      面：593-602,I0013页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China (No.21972049) the Guangdong-Hong KongMacao Greater Bay Area Exchange Programs of SCNU (2022) 

主　　题：Lithium-ion batteries Propylene carbonate Localized high-concentration electrolyte Non-Inert diluent Graphite||NMC622 pouch cells 

摘      要：Although high salt concentration electrolyte(HCE)can construct effective Li F-rich interphase film and solve the interphasial instability issue of graphite anode,its high cost,high viscosity and poor wettability with electrode materials limit its large-scale ***,localized high concentration electrolyte(LHCE)is obtained by introducing an electrochemically inert diluent into HCE to avoid the above-mentioned problems while maintaining the high interphasial stability of HCE with graphite *** traditional inert diluents,1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluropropyl ether(TTE)with electrochemical activity is introduced into propylene carbonate(PC)-based HCE to obtain LHCE-2(1 M LiPF_(6),PC:DMC:TTE=1:1:6.1)*** and theoretical simulation results show that TTE participates in the oxidation decomposition and film-forming reaction at the NCM622 cathode surface,conducting a cathode electrolyte interphase(CEI)rich in organic fluorides with excellent electron insulation ability,high structural stability and low interphasial *** to the outstanding interphasial properties induced by LHCE-2,the graphite||NMC622 pouch cell reaches a capacity retention of 80%after 500 cycles at 1 C under room *** at sub-zero temperatures,the capacity released by the cell with LHCE-2 electrolyte is significantly higher than that of HCE and conventional EC-based ***,the LHCE-2 electrolyte inherits the advantages of TTE flame-resistant,thus improving the safety of the battery.