含硼锂盐添加剂改善己二腈与石墨相容性的研究  

Study on Improving the Compatibility of Adiponitrile and Graphite with Boron-containing Lithium Salt Additives

作　　者：张晶晶 冯荷清 孙金龙 王鹏[1,2,3] 宋林虎 东红 李世友 赵冬妮[1,2,3] ZHANG Jing-jing;FENG He-qing;SUN Jin-long;WANG Peng;SONG Lin-hu;DONG Hong;LI Shi-you;ZHAO Dong-ni(School of Petrochemical Technology,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province,Lanzhou,Gansu 730050,China;Gansu Engineering Laboratory of Electrolyte Material for Lithium-ion Battery,Lanzhou,Gansu 730050,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]甘肃省低碳能源化工重点实验室,甘肃兰州730050 [3]甘肃省锂离子电池电解液材料工程实验室,甘肃兰州730050

出　　处：《浙江化工》2022年第1期5-9,共5页Zhejiang Chemical Industry

基　　金：国家自然科学基金(21766017);甘肃省自然科学基金(20JR5RA469)。

摘　　要：腈类溶剂作为锂离子电池高电压电解液体系常用溶剂之一,因其特殊的结构和较高的还原电位,不能在石墨负极表面形成较好的表面钝化膜,从而造成腈类溶剂很难在高电压全电池体系中得以应用。为了解决上述问题,本文使用含硼锂盐双草酸硼酸锂(LiBOB)和二氟草酸硼酸锂(LiDFOB)作为电解液添加剂,通过优化电极/电解液界面膜,解决因己二腈与石墨相容性差而导致电池容量衰减的问题。Nitrile solvent is one of the commonly used solvents in high-voltage electrolyte system of lithiumion battery. Due to its special structure and high reduction potential, it cannot form a good surface passivation film on the surface of graphite negative electrode. As a result, it is difficult for nitrile solvent to be applied in high-voltage full battery system. In order to solve the above problems, boron-containing lithium salts, lithium bis(oxalate) borate(LiBOB) and lithium difluoro(oxalate) borate(LiDFOB) were used as electrolyte additives in this paper. The problem of battery capacity attenuation caused by poor compatibility between adiponitrile and graphite was solved by optimizing the electrode/electrolyte interface film.

关 键 词：锂离子电池 石墨 己二腈 含硼添加剂 固态电解液界面(SEI)膜 相容性 

分 类 号：TM912[电气工程—电力电子与电力传动]