欢迎访问《电化学(中英文)》期刊官方网站,今天是

电化学(中英文) ›› 2015, Vol. 21 ›› Issue (4): 387-392.  doi: 10.13208/j.electrochem.150430

• 研究论文 • 上一篇    下一篇

二氟草酸硼酸钠作为电解液添加剂对石墨负极性能的影响

姚洋洋1,3,刘冬冬1,王莉2,何向明2,3,李建军2,3,张鼎1*   

  1. 1. 太原理工大学化学化工学院,山西 太原 030024;2. 清华大学核能与新能源技术研究院,北京 100084;3. 江苏华东锂电技术研究院,江苏 张家港 215600
  • 收稿日期:2015-04-30 修回日期:2015-05-29 出版日期:2015-08-28 发布日期:2015-08-28
  • 通讯作者: 张鼎 E-mail:zhangding@tyut.edu.cn
  • 基金资助:

    太原理工大学校青年基金(No. 2013Z045)资助

Sodium Difluoro(oxalato)borate as An Electrolyte Additive to Improve the Electrochemical Performance of Graphite Anode

YAO Yang-yang1,3, LIU Dong-dong1, WANG Li2, HE Xiang-ming2,3, LI Jian-jun2,3, ZHANG Ding1*   

  1. 1. College of chemistry and chemical engineering of Taiyuan University of Technology, Taiyuan 030024, Shanxi, China; 2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China; 3. Jiangsu Huadong Institute of Li-ion Battery, Zhangjiagang 215600, Jiangsu, China
  • Received:2015-04-30 Revised:2015-05-29 Published:2015-08-28 Online:2015-08-28
  • Contact: ZHANG Ding E-mail:zhangding@tyut.edu.cn

摘要: 锂离子电池日益广泛的应用对其性能提出越来越高的要求,而在电解液中加入适当的添加剂能够显著提升电极材料的电化学性能. 本文首次在1 mol·L-1 LiPF6/EC + DMC + EMC(体积比1:1:1)的电解液中添加一定量的二氟草酸硼酸钠(NaDFOB),并通过循环伏安(CV)、电化学阻抗图谱(EIS)和扫描电子显微镜(SEM)等分析考察了其对石墨负极材料性能的具体影响. 结果显示,添加NaDFOB的电解液显著提高了石墨材料在常温下的可逆充放电容量和循环性能,同时明显改善了石墨材料的高温循环性能. 其机理在于NaDFOB的阴阳离子同时参与了石墨表面固体电解质界面膜(SEI)的形成,形成高稳定性的电解液/电极界面.

关键词: 锂离子电池, 电解液添加剂, 石墨, 固体电解质界面膜, 二氟草酸硼酸钠

Abstract: The fast development in applications of Li-ion batteries (LiBs) in daily life urges for better electrochemical performance of LiBs, which can be promoted by adding appropriate electrolyte additives. This work studied the effect of NaDFOB as the additive on a common electrolyte formula (1 mol·L-1 LiPF6 in EC+DMC+EMC, 1:1:1 by volume). Analysis methods such as CV, EIS and SEM were adopted to study electrochemical performance of experimental battery and interface profiles. It was revealed that the reversible charge-discharge capacity and cycling performance of graphite anode had been dramatically improved. In addition, the cycling performance of graphite anode at moderate temperature was obviously improved by the adoption of NaDFOB. Both anion and cation in NaDFOB participated the formation of SEI film on the graphite anode surface and thus generated a highly stable electrolyte/electrode interface.

Key words: Li-ion battery, electrolyte additive, graphite, SEI film, sodium difluoro (oxalato)borate

中图分类号: