聊城大学学报（自然科学版）2025，Vol.38Issue(5)：707-714,755,9.DOI:10.19728/j.issn1672-6634.2025040014
二氟草酸硼酸锂和三(三甲基硅基)硼酸酯协同作用在高电压电解液中的应用
Application of synergistic action of lithium difluoroxalate and trimethylsilyl borate in high voltage electrolyte
摘要
Abstract
In conventional electrolytes,due to the high value of the highest occupied molecular orbital of the main solvent cyclic carbonate,cyclic carbonate is constantly oxidized and decomposed when the char-ging voltage reaches 4.3 V or even higher,and the instability of the electrolyte at high voltages leads to a sudden decrease in the battery capacity.Therefore,the development of high-voltage resistant electrolyte is urgent.In this work,lithium difluoro-oxalate borate(LiODFB)was used to replace part of lithium hexafluorophosphate(LiPF6),and the anode film-forming additive tris(trimethylsilyl)borate(TMSB)was added at the same time,to inhibit the decomposition of the solvent through the synergistic effect of LiODFB and TMSB,and to form a cathode electrolyte interface film containing B—O,Si—O and an ap-propriate amount of LiF,to stabilize the structure of the cathode material,and to improve the stability of the electrolyte in the oxidation of 4.6 V.Based on the above,the designed electrolyte formulation:0.5 mol/L LiPF6+0.5 mol/L LiODFB+FEC∶EMC(1∶3)+TMSB(weight percent 5％)was used.Ap-plied to Li/LiNi0.8Mn0.1Co0.1O2 full cell,the electrolyte-matched cell also has a discharge specific capacity of 131.4 mA·h·g-1 and a capacity retention of 70.3％after cycling 500 cycles at a current density of 1 C at 4.6 V.关键词
锂离子电池/电解液/高电压Key words
lithium-ion batteries/electrolyte/high voltage分类
化学化工引用本文复制引用
张朝阳,张迎,段俊峰,万豪杰,董磊,曾嵘,刘建文..二氟草酸硼酸锂和三(三甲基硅基)硼酸酯协同作用在高电压电解液中的应用[J].聊城大学学报（自然科学版）,2025,38(5):707-714,755,9.基金项目
国家自然科学基金项目(21978073,U190321) （21978073,U190321）
湖北省重点研发计划项目(2023BAB148) （2023BAB148）
武汉都市圈协同创新项目(2024070904020440)资助 （2024070904020440）
