All-fluorinated electrolyte for non-flammable batteries with ultra-high specific capacity at 4.7 V

作     者：Zhe Wang Zhuo Li Jialong Fu Sheng Zheng Rui Yu Xiaoyan Zhou Guanjie He Xin Guo Zhe Wang;Zhuo Li;Jialong Fu;Sheng Zheng;Rui Yu;Xiaoyan Zhou;Guanjie He;Xin Guo

作者机构：State Key Laboratory of Material Processing and Die&Mould TechnologyLaboratory of Solid State IonicsSchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Electrochemical Innovation LabDepartment of Chemical EngineeringUniversity College London20 Gordon StreetLondon WC1E 7JEUK 

出 版 物：《Green Energy & Environment》 (绿色能源与环境（英文版）)

年 卷 期：2024年第9卷第10期

页      面：1601-1609页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：the National Natural Science Foundation of China and the Israeli Science Foundation for funding this research within the framework of the joint NSFC-ISF grant#51961145302 supported by China Postdoctoral Science Foundation funded project(Grant#2020M682403) 

主　　题：Fluorinated electrolyte Li metal batteries Solid electrolyte interphase Cathode electrolyte interphase Coulombic efficiency 

摘      要：Li metal batteries(LMBs)with LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(NMC811)cathodes could release a specific energy of500 Wh kg^(-1) by increasing the charge ***,high-nickel cathodes working at high voltages accelerate degradations in bulk and at interfaces,thus significantly degrading the cycling lifespan and decreasing the specific ***,we rationally design an all-fluorinated electrolyte with addictive tri(2,2,2-trifluoroethyl)borate(TFEB),based on 3,3,3-fluoroethylmethylcarbonate(FEMC)and fluoroethylene carbonate(FEC),which enables stable cycling of high nickel cathode(LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2),NMC811)under a cut-off voltage of 4.7 V in Li metal *** electrolyte not only shows the fire-extinguishing properties,but also inhibits the transition metal dissolution,the gas production,side reactions on the cathode ***,the NMC811||Li cell demonstrates excellent performance by using limited Li and high-loading cathode,delivering a specific capacity220 mA h g^(-1),an average Coulombic efficiency99.6%and capacity retention99.7%over 100 cycles.