摘要
锂离子电池与商业碳酸酯电解液的兼容性差,在长循环过程中易产生锂枝晶,导致容量快速衰减,特别是在高温或低温条件下,伴随着不稳定的电解液/锂界面,导致副反应增多,电池快速失效。以1.2mol/L二氟草酸硼酸锂(LiDFOB)/四氟硼酸锂(LiBF_(4))/碳酸乙烯酯(EC)/碳酸二乙酯(DEC)+质量分数12%的氟代碳酸乙烯酯(FEC)作为电解液,在钴酸锂(LiCoO_(2))/40μm-Li电池体系中能耐受4.53V(vs.Li/Li^(+))的高电压,并且在-15~60℃温区范围内表现出优异的循环性能。常温循环300圈后,容量保持率大于93%;-15℃和60℃条件下循环150圈,容量保持率均大于91%。
Li-ion batteries are not compatible with commercial carbonate electrolytes,and Li dendrites are easily generated during cycling,resulting in rapid degradation of the capacity.Especially,the unstable electrolyte/Li interface at high temperature or low temperature,increases side reactions and leads to rapid failure.1.2mol/L Li difluorooxalate borate(LiDFOB)/Li tetrafluoroborate(LiBF_(4))/ethylene carbonate(EC)/diethyl carbonate(DEC)+12wt.%fluoroethylene carbonate(FEC)was used as the electrolyte,which was able to withstand a high voltage of 4.53V(vs.Li/Li^(+))in the LiCoO_(2)/40μm-Li cell.And it shown an excellent cycle performance in-15~60℃.At room temperature,the capacity retention was>93%after 300cycles.At-15℃and 60℃,the capacity retention were both>91%after 150cycles.
作者
黄杜斌
王培民
邬金龙
Huang Dubin;Wang Peimin;Wu Jinlong(Zhejiang Gold Feather New Energy Technology Co.,Ltd.,Huzhou 313300;Beijing Gold Feather New Energy Technology Co.,Ltd.,Beijing 100015;Geely University of China,Beijing 102202)
出处
《化工新型材料》
CAS
CSCD
北大核心
2021年第S01期203-209,共7页
New Chemical Materials
关键词
锂离子电池
钴酸锂
四氟硼酸锂
高电压
Li-ion battery
lithium cobalt oxide
lithium tetrafluoroborate
high voltage
作者简介
黄杜斌(1988-),男,博士研究生,从事新型锂电池材料研究工作,E-mail:huangdubin@gfenergy.com。
