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电化学(中英文) ›› 2003, Vol. 9 ›› Issue (1): 23-29. 

• 研究论文 • 上一篇    下一篇

联苯用作锂离子电池过充安全保护剂的研究

肖利芬,艾新平,曹余良,杨汉西   

  1. 武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院 湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072
  • 收稿日期:2003-02-28 修回日期:2003-02-28 出版日期:2003-02-28 发布日期:2003-02-28

Application of Biphenyl Electroploymerization for Overcharge Protection in Li-ion Batteries

XIAO Li_fen, AI Xin_ping*,CAO Yu_liang, YANG Han_xi   

  1. (College of chemistry & molecular science, Wuhan University, Wuhan 430072,China)
  • Received:2003-02-28 Revised:2003-02-28 Published:2003-02-28 Online:2003-02-28

摘要:  以联苯在高电压下的电聚合反应用于锂离子电池过充保护.实验表明,于电解液中加入的联苯可在4.5~4.75V(相对于Li/Li+)下发生氧化电聚合反应,生成的导电聚合物可使过充的电池自动放电至更安全的充电状态.同时,电聚合产物使电池内阻升高、内压增大,从而提高了与其联用的保护装置的灵敏度.在正常充放电状态下,联苯的加入基本不影响电池的综合电性能.

关键词: 锂离子电池, 电聚合, 过充保护, 联苯

Abstract: The electropolymerization of biphenyl at overcharged positive electrode was investigated for overcharge protection of Li_ion batteries. Biphenyl in electrolyte as an additive can electrochemically polymerize at 4.5~4.75 V(vs. Li/Li+) to form a layer of conductive film on cathode surface. The surface film increases the internal resistance and the gases released during the electropolymerization also increases the internal pressure of the batteries, which therefore enhance the sensitivities of the electrical disconnecting devices. During prolonged overcharge, the growth of the conductive polymer film can create short circuit between the positive and negative electrodes and cause self_discharge of the batteries to a safer state. Furthermore, no severe detrimental effects were observed on the battery performances in normal state of charge_discharge.

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