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

Authors

Li-fen XIAO, Shanghai University,Shanghai 200436,China;
Xin-ping AI, College of chemistry & molecular science, Wuhan University, Wuhan 430072,China);
Yu-liang CAO, College of chemistry & molecular science, Wuhan University, Wuhan 430072,China);
Han-xi YANG, College of chemistry & molecular science, Wuhan University, Wuhan 430072,China);

Corresponding Author

Xin_ping AI

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.

DOI Link

https://doi.org/10.61558/2993-074X.1479

Publication Date

2003-02-28

Online Available Date

2003-02-28

Revised Date

2003-02-28

Received Date

2003-02-28

Recommended Citation

Li-fen XIAO, Xin-ping AI, Yu-liang CAO, Han-xi YANG. Application of Biphenyl Electroploymerization for Overcharge Protection in Li-ion Batteries[J]. Journal of Electrochemistry, 2003 , 9(1): 23-29.
DOI: 10.61558/2993-074X.1479
Available at: https://jelectrochem.xmu.edu.cn/journal/vol9/iss1/5

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