Exploring high-voltage fluorinated carbonate electrolytes for LiNi0.5Mn1.5O4 cathode in Li-ion batteries

作     者：Xi Zheng Ying Liao Zhongru Zhang Jianping Zhu Fucheng Ren Huajin He Yuxuan Xiang Yezhen Zheng Y.Yang Xi Zheng;Ying Liao;Zhongru Zhang;Jianping Zhu;Fucheng Ren;Huajin He;Yuxuan Xiang;Yezhen Zheng;Y.Yang

作者机构：State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy Materials(iChEM)and Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina College of EnergyXiamen UniversityXiamen 361102FujianChina 

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

年 卷 期：2020年第29卷第3期

页      面：62-70页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 081704[工学-应用化学] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：financially supported by National Key Research and Development Program of China(Grant no.2018YFB010440) the National Natural Science Foundation of China(Grant nos.21761132030,21621091) 

主　　题：Fluorinated solvent High voltage electrolyte LiNi0.5Mn1.5O4 Interphase film Additive Lithium-ion batteries 

摘      要：Ethyl-(2,2,2-trifluoroethyl)carbonate(ETFEC)is investigated as a solvent component in high-voltage electrolytes for LiNi0.5Mn1.5O4(LNMO).Our results show that the self-discharge behavior and the high temperature cycle performance can be significantly improved by the addition of 10%ETFEC into the normal carbonate electrolytes,e.g.,the capacity retention improved from 65.3%to 77.1%after 200 cycles at 60℃.The main reason can be ascribed to the high stability of ETFEC which prevents large oxidation of the electrolyte on the cathode *** addition,we also explore the feasibility of electrolytes using single fluoriated-solvents with and without *** results show that the cycle performance of LNMO material can be greatly improved in 1 MLiPF6+pure ETFEC-solvent system with 2 wt%ethylene carbonate(EC)or ethylene sulfate(DTD).The capacity retention of the LNMO materials is 93%after 300 cycles,even better than that of carbonate-based *** is shown that the additives are oxidized on the surface of LNMO particles and contribute to the formation of cathode/electrolyte interphase(CEI)*** composite CEI film plays a crucial role in suppressing the serious decomposition of the electrolyte at high voltage.