醋酸纤维素改性的P(VDF-HFP)-PEO基聚合物电解质的制备及性能研究  

Preparation and Properties of Cellulose Acetate Modified P(VDF-HFP)-PEO Based Polymer Electrolyte

作　　者：张锦标 薛照明[1] ZHANG Jin-biao;XUE Zhao-ming(School of Chemistry and Chemical Engineering,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学化学化工学院,安徽合肥230601

出　　处：《塑料工业》2020年第4期114-118,共5页China Plastics Industry

摘　　要：通过相转化法制备了一种由醋酸纤维素(CA)改性的P(VDF-HFP)-PEO聚合物隔膜,并将隔膜浸入锂盐溶液中得到凝胶态电解质(GPE)。通过扫描电子显微镜(SEM)、示差扫描量热分析仪(DSC)、热重分析仪(TGA)、交流阻抗仪、电化学工作站对隔膜及GPE的相关性能进行了表征测试。结果表明,CA改性后的聚合物隔膜相比改性前具有更好的孔结构、更优异的热学性能和吸液效果。这些特点赋予了GPE更高的离子电导率(室温下2.68×10^-3 S/cm),同时电化学窗口也达到4.25 V(vs.Li+/Li)。使用所制备的GPE组装电池进行测试,表现出了较好的放电容量和循环稳定性能。A polymer membrane of cellulose acetate(CA)modified P(VDF-HFP)-PEO was prepared by phase inversion.The polymer membrane were immersed into Lithium salt solution to form gel polymer electrolyte(GPE).Performance of polymer membrane and GPE were investigated through scanning electron microscopy(SEM),differential scanning calorimetry(DSC),thermogravimetric analysis(TGA),alternating current(AC)impedance meter and electrochemical workstation.The results show that the polymer membrane modified by CA has better pore structure,better thermal performance and liquid absorption effect comparing with the pure P(VDF HFP)-PEO,which endows the corresponding GPE with more excellent ionic conductivity(2.68×10^-3 S/cm at room temperature),and higher electrochemical stability potential[4.25 V(vs.Li+/Li)].The prepared battery for the GPE also presents excellent initial discharge capacity and cycling performances in battery performance test.

关 键 词：锂离子电池 凝胶态聚合物电解质 醋酸纤维素 

分 类 号：TQ152[化学工程—电化学工业]