A polytriphenylamine-modified separator with reversible overcharge protection for 3.6 V-class lithium-ion battery

作者：Li S L; Ai X P^*; Yang H X; Cao Y L

来源：Journal of Power Sources, 2009, 189(1): 771-774.

DOI：10.1016/j.jpowsour.2008.08.006

• Lithium-ion battery
• Overcharge protection
• Potential-switchable separator
• Electroactive polymer
• Polytriphenylamine

A polytriphenylamine (PTPAn)-modified separator was prepared simply by impregnating triphenylamine monomers into a commercial Celgard separator and in situ polymerizing the monomers into electroactive phase by oxidant ozone. This type of electroactive separator can transform from an insulating state to a conductive state at overcharged voltage of similar to 3.7 V (vs. Li( )/Li) and act as a self-actuating potential-switchable separator for overcharge protection of LiFePO(4)/C Li-ion batteries. The experimental results demonstrated that this electroactive separator can reversibly control the cell';s voltage at the safe value less than 4.15 V at high rate overcharge of 2C current without obvious negative impact on the normal charge-discharge performances of the commercial LiFePO(4)/C batteries even at prolonged overcharge cycling, showing a potential application in 3.6 V-class lithium-ion batteries.

• 出版日期2009-4-1
• 单位武汉大学