| As a type of novel rechargeable battery, gel polymer lithium-ion battery (GPLB) has some excellent performances comparing to liquid lithium-ion battery, such as high energy density and long cycle life. Furthermore, GPLB contains no free liquid electrolyte and thus has more safety and processing performances than liquid lithium-ion battery. Gel polymer electrolyte (GPE) is crucial in a GPLB system, and its research has attracted more and more attention all over the world.In our studies, two types of novel series of gel polymer electrolytes with different compositions were prepared via ultraviolet initiated polymerization. Such GPEs with good mechanical property, electrochemistry property and thermal property were desirably applied in lithium-ion battery.Firstly,gel polymer electrolyte films consisting of PEGDMA/AMPS copolymers and Li+ electrolytes with different weight ratio were prepared. FTIR and SEM were used to investigate their microstructure. Also, the electrochemical characteristics and thermal properties were investigated by LSV, TGA and DSC. The highest conductivity could reach 1.14×10-3 S/cm at room temperature.Secondly,gel polymer electrolyte films with different weight ratio containing PEGDMA/AMPS/TFEMA copolymer and liquid electrolytes were prepared. Compared with the first series of GPE based on PEGDMA/AMPS copolymer,this kind of GPE has better mechanical and thermal properties, and higher conductivity. The optimum weight ratio of PEGDMA/AMPS/TFEM in this study was 60/35/5,with conductivity up to 1.76×10-3S/cm and electrochemical stability up to 5.0V. The good comprehensive performances indicated that this novel type of gel polymer electrolytes could be used as electrolyte materials for rechargeable lithium ion batteries.
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