电解质对锂离子电池正极材料界面特性的影响  

Effects of Eelectrolyte Salt to the SEI Layer of LiCoO_2 Material

作　　者：郑明森[1] 董全峰[1] 朱亚薇[1] 詹亚丁[1] 林祖赓[1] 

机构地区：[1]厦门大学化学化工学院化学系固体表面物理化学国家重点实验室

出　　处：《电化学》2006年第2期223-226,共4页Journal of Electrochemistry

基　　金：973项目(2002CB211800);国家自然科学基金(20373058);厦门市科技计划项目(3502Z20055018)资助

摘　　要：研究L iPF6、L iC lO4和L iBF43种电解质对L iCoO2材料界面特性的影响.结果表明:化成后的L iCoO2表面存在固态电解质膜(SEI膜);在不同成分的电解液中,L iCoO2表面SEI膜的形成电位、形貌特征以及材料的可逆容量、平均放电电压和电化学反应阻抗不同.The character of the solid electrolyte interface （ SEI layer） on the surface of LiCoO2 formed in the electrolytes contained different salt such as LiPF6, LiClO4 and LiBF4 were studied in this paper. The results showed that the SEI film exists in all three electrolytes after the processes of charge and discharge. The morphological character and the formation voltage of the SEI layer of LiCoO2 were different in different electrolytes. The electrochemical performance of the battery such as reversible capacity, average discharge voltage and electrochemical impedance were affected significantly by SEI film formed in different electrolytes.

关 键 词：锂离子电池 电解质 SEI膜 

分 类 号：TM912[电气工程—电力电子与电力传动]