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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

钾盐添加剂改善天然石墨负极的嵌脱锂性质

郑洪河1, 王显军2, 李苞1, 常照荣1   

  1. 1. 河南师范大学化学与环境科学学院, 新乡 453007; 2．河南教育学院物理系, 郑州 450014

  • 收稿日期:2005-09-29 修回日期:2006-01-18 出版日期:2006-09-20 网络出版日期:2006-09-20

Potassium Salts as Electrolyte Additives for Enhancing Electrochemical Performances of Natural Graphite Anodes

ZHENG Hong-He1, WANG Xian-Jun2, LI Bao1, CHANG Zhao-Rong1   

  1. 1. College of Chemistry & Environmental Sciences, Henan Normal University, Xinxiang 453007, China; 2. Department of Physics, Henan Institute of Education, Zhengzhou 450014, China

  • Received:2005-09-29 Revised:2006-01-18 Published:2006-09-20 Online:2006-09-20

PDF (PC)

1900

被引次数

9

摘要： 于1mol/L LiClO4/EC+DEC电解液中添加不同的钾盐可以显著降低天然石墨电极首次循环过程中的不可逆容量损失, 提高电极的可逆容量和倍率充放电性能. 交流阻抗和电极表面固体电解质相界面(SEI)膜组分的FTIR分析表明, 添加一定量的钾盐可以降低SEI膜的锂盐含量, 有助于形成Li+迁移性良好的SEI膜.

关键词: 锂离子蓄电池, 天然石墨, 电解液, 添加剂

Abstract: Addition of different potassium salts into 1mol/L LiClO4/EC+DEC electrolyte can reduce the initial irreversible capacity loss at the first cycle and improve the reversible capacity and the rate capability of a natural graphite anode. Electrochemical impedance spectroscopy (EIS) and FTIR studies demonstrated the formation of a more conductive and thinner SEI layer on the graphite surface in the electrolyte containing a certain amount of potassium salt.

Key words: lithium-ion battery, natural graphite, electrolyte, additive

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