EC基电解液添加剂对锂离子电池性能的影响  

Effect of EC-based electrolyte additive on the performance of Li-ion battery

作　　者：姜文博 王宥宏[1,2] 张俊婷 王倩倩[1] JIANG Wen-bo;WANG You-hong;ZHANG Jun-ting;WANG Qian-qian(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi 030024,China;Shanxi Wotehaimer New Materials Technology Co.,Ltd.,Taiyuan,Shanxi 030108,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]山西沃特海默新材料科技股份有限公司,山西太原030108

出　　处：《电池》2022年第2期144-147,共4页Battery Bimonthly

摘　　要：以碳包覆Si合金粉末与人造石墨混合作为负极材料,制备CR2032型扣式电池,探讨氟代碳酸乙烯酯(FEC)、碳酸亚乙烯酯(VC)和氯代碳酸乙烯酯(CEC)等3种电解液添加剂对Si-C负极材料半电池性能的影响。适当的添加剂会先于碳酸酯类溶剂在负极材料表面形成薄而稳定的固体电解质相界面(SEI)膜,抑制碳酸酯类溶剂在充放电过程中的分解,使Si合金粉末的碳包覆壳保持稳定,同时解决Si-C负极材料的体积膨胀问题。当FEC、VC和CEC的添加量(体积分数)分别为3%、1%和3%时,电池的放电比容量、首次库仑效率和循环稳定性均得到改善。以100 mA/g电流在0.01~3.00 V充放电,Si-C负极材料的首次放电比容量达452.60 mAh/g,首次库仑效率达91.90%;第循环150次的容量保持率为86.50%。CR2032 type button cell was prepared by mixing carbon coated Si alloy powder with artificial graphite as anode material.The effects of three electrolyte additives including fluoro vinyl carbonate(FEC),vinylene carbonate(VC) and chloro-ethylene carbonate(CEC)on the performance of the half-cell made by Si-C anode were discussed.The appropriate additive could form a thin and stable solid electrolyte interphase(SEI)film on the surface of the anode material before carbonic ester solvent, which inhibited the decomposition of the carbonate solvent in the process of charge-discharge, stabilized the structure of Si alloy power coated by C,solving the volume expansion of Si-C anode materials.When the addition(volume fraction)of FEC,VC and CEC was 3%,1% and 3%,respectively, the specific discharge capacity, initial Coulombic efficiency and cycle stability of the battery were improved.When charged-discharged in 0.01-3.00 V at the current of 100 mA/g, the initial specific discharge capacity of Si-C anode material was 452.60 mAh/g, the initial Coulombic efficiency was 91.90%,the capacity retention rate was 86.50% at the 150 th cycle.

关 键 词：锂离子电池 电解液 添加剂 电化学性能 碳酸乙烯酯(FEC) 碳酸亚乙烯酯(VC) 氯代碳酸乙烯酯(CEC) 

分 类 号：TM912.9[电气工程—电力电子与电力传动]