摘要
聚合物电解质的分子结构设计可实现更高的离子电导率和更好的电化学性能。通过原位紫外光聚合,制备具有电解质/电极一体式结构的甲基丙烯酸三氟乙酯(TFEMA)改性碳酸乙烯亚乙酯(VEC)的氟化碳酸酯基准固态电解质(QSE),室温离子电导率为1.24 mS/cm,具有2.0~4.5 V的电化学窗口,与锂负极的兼容性良好。在2.5~4.0 V对Li|LiFePO_(4)电池进行测试:室温下,0.5 C最大放比容量为166.0 mAh/g,第100次循环的容量保持率为86.3%;60℃下,1.0 C首次放电比容量为153.8 mAh/g,第100次循环的容量保持率为86.2%。
The design of molecular structure for polymer electrolytes enables higher ionic conductivity and superior electrochemical performance.The fluorinated carbonate-based quasi-solid electrolyte(QSE)of trifluoroethyl methacrylate(TFEMA)modified vinyl ethylene carbonate(VEC)with an integrated electrolyte-electrode structure is prepared by in-situ ultraviolet(UV)photopolymerization.Fluorinated QSE-A exhibits room temperature ionic conductivity of 1.24 mS/cm with a electrochemical window of 2.0-4.5 V,leading to a good compatible with lithium anode.The Li|LiFePO_(4) battery is tested in 2.5-4.0 V.At room temperature,the maximum specific discharge capacity at 0.5 C is 166.0 mAh/g,the capacity retention rate after 100 cycles is 86.3%.At 60℃,the initial specific discharge capacity at 1.0 C is 153.8 mAh/g,the capacity retention rate after 100 cycles is 86.2%.
作者
陈泽华
杜丽
CHEN Zehua;DU Li(School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510641,Guangdong,China)
出处
《电池》
北大核心
2025年第3期451-455,共5页
Battery Bimonthly
关键词
锂离子电池
固态电池
电解质
酯基电解质
固态聚合物电解质
原位紫外光聚合
电化学性能
Li-ion battery
solid-state battery
electrolyte
carbonate-based electrolyte
solid polymer electrolyte
in situ ultraviolet photopolymerization
electrochemical performance
