The composite polymer electrolyte was prepared by blending self-synthesized lithium salt Li-NO2BTFSI,MIL-101(Cr) filler loaded with ionic liquid (Li-IL),and polyethylene oxide (PEO) through solution casting method.The experimental results demonstrated that the separator exhibited an ionic conductivity of 2.95×10-5S/cm at 30℃ and an electrochemical stability window of 5.31V.The battery assembled with lithium iron phosphate demonstrated excellent electrochemical performance,with an initial discharge specific capacity of 166.2mAh/g at 60℃ and 0.2C.After 100 stable cycles,the discharge specific capacity remained at 159.2mAh/g,achieving a capacity retention rate of 96%.The assembled lithium symmetric battery,subjected to charge-discharge cycles at 0.1mA/cm2,could operate stably for 950h.These improvements were attributed to the addition of Li-IL@MIL-101(Cr),which reduced the crystallinity of PEO,promoted lithium ion transport,and significantly enhanced interface stability.
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基金资助
国家自然科学基金(22062004);贵州师范大学学术新苗基金项目(黔师新苗[2021]A08号)
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