聚偏氟乙烯基交联凝胶聚合物电解质的制备及性能  

Preparation and Performance of Poly(vinylidene fluoride)-Based Crosslinked Gel Polymer Electrolytes

作　　者：肖琴[1] 陈云妮 李青音 任世杰[1] Qin Xiao;Yunni Chen;Qingyin Li;Shijie Ren(College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学高分子科学与工程学院高分子材料工程国家重点实验室(四川大学),四川成都610065

出　　处：《高分子材料科学与工程》2020年第8期1-10,共10页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51973128);四川省科技厅重点研发项目(2019YJ0128);高分子材料工程国家重点实验室固定人员自主课题探索项目(sklpme2018-2-05)。

摘　　要：以聚偏氟乙烯(PVDF)为基体,三嵌段共聚物聚苯乙烯-聚环氧乙烷-苯乙烯(PS_(25)-PEO-PS_(25))为添加剂,通过相转化法和傅-克烷基化反应制备了超交联PVDF/PS_(25)-PEO-PS_(25)共混多孔聚合物膜(CPMs),CPMs浸泡电解液活化后得到交联凝胶聚合物电解质(CGPEs)。系统研究了PS_(25)-PEO-PS_(25)的添加量对CPMs结晶性和热稳定性以及对CGPEs电化学性能的影响。X射线衍射分析和差示扫描量热法测试结果表明,PS_(25)-PEO-PS_(25)的添加明显降低了CPMs结晶性和熔点;扫描电子显微镜测试显示,经300℃热处理后的CPMs仍保留有大量孔结构;离子电导率和充放电性能测试结果表明,当PS_(25)-PEO-PS_(25)添加量为30%时,CGPE-30%室温下的离子电导率达到最高为2.11 mS/cm,并且在0.1 C下循环50次后,容量几乎没有出现衰减,展现出优异的循环性能。With poly(vinylidene fluoride)(PVDF)as matrix and polystyrene-b-poly(ethylene oxide)-b-polystyrene(PS25-PEO-PS25)triblock copolymers as additive,hyper-crosslinked porous polymer membranes(CPMs)were prepared by the combination of phase inversion and Friedel-Craft reaction.The CPMs were then activated by absorbing liquid electrolyte to obtain crosslinked gel polymer electrolytes(CGPEs).Then the effects of PS25-PEO-PS25 amounts on the crystallinity and thermostability of the CPMs and electrochemical performance of the CGPEs were studied.The results of X-ray diffraction and differential scanning calorimetry show that the addition of PS25-PEO-PS25 can reduce the crystallinity of CPMs effectively.And it is proved that there are still a lot of pore structures in CPMs after heat treatment at 300℃by scanning electron microscope.Furthermore,the results of ion conductivity and charge-discharge performance test show that when the addition amount of PS25-PEO-PS25 reaches 30%,GPE-30%has the highest ionic conductivity of 2.11 mS/cm at room temperature,and the capacity of GPE-30%keeps well after 50 cycles at 0.1 C,indicating its excellent cycle performance.

关 键 词：聚偏氟乙烯 聚苯乙烯-聚环氧乙烷-苯乙烯 相转化法 傅-克烷基化反应 凝胶聚合物电解质 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]