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

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...

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Bibliographic Details
Published in:Journal of power sources 2009-04, Vol.189 (1), p.771-774
Main Authors: Li, S.L., Ai, X.P., Yang, H.X., Cao, Y.L.
Format: Article
Language:English
Subjects:
Applied sciences
Batteries
Direct energy conversion and energy accumulation
Electric batteries
Electric potential
Electrical engineering. Electrical power engineering
Electrical power engineering
Electroactive polymer
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Lithium-ion batteries
Lithium-ion battery
Monomers
Overcharge protection
Polytriphenylamine
Potential-switchable separator
Separators
Vanadium
Voltage
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Summary: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 ∼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 2 C 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.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2008.08.006