Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (24): 2815-2821. Previous Articles     Next Articles

Special Topic

功能添加剂对锂离子电池的防过充电化学行为研究

曾彪,刘素琴,黄可龙,王海燕,黄建函,刘建生   

  1. 湖南长沙 中南大学
  • 投稿日期:2009-02-05 修回日期:2009-05-11 发布日期:2010-02-04
  • 通讯作者: 曾彪 E-mail:zengbiao1221@126.com
  • 基金资助:

    国家自然科学基金(200804058);广东省教育部产学研结合项目基金(NO:2007A090302034)

Electrochemical Behavior of Function Additive for Overcharge Protection of Li-Ion Batteries

  • Received:2009-02-05 Revised:2009-05-11 Published:2010-02-04
  • Contact: Zeng Biao E-mail:zengbiao1221@126.com

The overcharge protection and electrochemical property of lithium ion batteries were studied by
microelectrode voltammetry, potentiodynamic polarization experiments, charge-discharge measurements
and SEM characterization of cell components, when functional additives such as biphenyl (BP) and
3-chloroanisole (3CA) were co-used in the electrolyte. The experimental results reveal that the polymerization
potential of electrolyte with mixed additives was moved forward from 4.7 to 4.6 V, as the content of
3-chloroanisole increased. When overcharged, 3-chloroanisole molecules were oxidized in the form of redox
shuttle reaction at the positive electrode, but biphenyl molecules were polymerized forming a compact film
on the surface of electrode. This film formed can effectively prevent the insertion and extraction of Li+. In
this way, the safety performance of lithium ion batteries can be improved by the co-use of the two additives
with different overcharge protection mechanisms.

Key words: lithium ion battery, electrolyte additive, overcharge protection, biphenyl, 3-chloroanisole