聚偏氟乙烯基聚合物电解质接枝改性研究进展

Research on grafting modification of PVDF based polymer electrolyte

聚偏氟乙烯基聚合物是锂离子电池用聚合物电解质较理想的基质材料,但也存在结晶度高、亲液性差等问题。主要综述了采用γ射线、电子束、紫外等辐射,原子转移自由基聚合及溶液接枝聚合等方法接枝苯乙烯、甲基丙烯酸缩水甘油酯、新戊二醇二丙烯酸酯、聚甲基丙烯酸甲酯、三丙烯乙二醇醚醋酸酯、聚乙二醇甲基丙烯酸酯、2-丙烯酰胺基-2-甲基丙磺酸、聚乙二醇等对聚偏氟乙烯基聚合物电解质的改性研究进展。接枝改性后的聚偏氟乙烯聚合物电解质对电解液的亲和性、离子电导率、电化学稳定性和循环性能都有一定程度的提高。

PVDF based polymers are ideal matrix materials for lithium ion battery electrolyte,but high crystal-linity and poor affinity to liquid electrolyte restrict their further development.In this paper,the grafting modifi-cation of PVDF based polymer electrolytes with styrene,glycidyl methacrylate,dimethyltrimethylene glycol di-acrylate,polymethyl methacrylate,tripropyleneglycol diacrylate,polyethylene glycol methacrylate,2-acrylam-ide-2-methyl propane sulfonic acid and polyethylene glycol by radiation,atom transfer radical polymerization and solution graft polymerization are introduced.In a certain extent,the affinity to liquid electrolyte,ionic con-ductivity,electrochemical stability and cycle performance have been enhanced.