Li-Cu合金作为锂电池负极材料的电化学性能  

Electrochemical Properties of Lithium-Rich Li-Cu Alloy Anode Prepared by Electrodeposition for Lithium Batteries

作　　者：燕波[1] 崔莹[1] 安茂忠[1] 杨培霞[1] 张锦秋[1] 赵彦彪[1] Bo Yan;Ying Cui;Maozhong An;Peixia Yang;Jinqiu Zhang;Yanbiao Zhao(State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering andTechnology, Harbin Institute of Technology, Harbin)

机构地区：[1]哈尔滨工业大学国家水资源与环境重点实验室,哈尔滨工业大学化工学院,哈尔滨

出　　处：《材料化学前沿》2014年第2期5-12,共8页Advances in Material Chemistry

基　　金：国家自然科学基金(项目编号:51074057)

摘　　要：从含有LiTFSI和Cu(p-oTs)2的1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐和N-甲基吡咯烷酮混合体系中电沉积出了Li-Cu合金。循环伏安测试表明,当Li从Li-Cu合金上溶解后,留下的Cu骨架仍然可以保持稳定。Li-Cu/LiFePO4电池的充放电测试表明当以0.2C的倍率充放电20个循环以后,电池的比容量可稳定保持在138.96 mAh/g。电化学阻抗谱和塔菲尔曲线测试表明在经过四个充放电循环后或者在电解液中浸泡三天以后,在Li-Cu合金表面形成了稳定的SEI膜。Li-Cu alloy was electrodeposited from [EMIm][TFSI] with N-methyl-2-pyrrolidone (NMP) containing mixtures of LiTFSI and Cu(p-oTs)2. The cyclic voltammetry for Li-Cu alloy indicated that the Cu frame could maintain stable when Li dissolved from the Li-Cu alloy. The charge-discharge performances of Li-Cu/LiFePO4 cells showed good stability with the specific capacity of 138.96 mAh/g after 20 cycles at 0.2C. The EIS and Tafel curves proved that stable SEI layers were formed after the fourth charge-discharge cycle or being immersed in the electrolyte for 3 days.

关 键 词：Li-Cu合金 Li-Cu/LiFePO4电池 SEI膜 

分 类 号：O6[理学—化学]