PPC/LAGP固态复合电解质制备与性能  

Preparation and Properties of PPC/LAGP Solid Composite Electrolytes

作　　者：张恒源 刘建叶[1] 祁丽亚 刘玮琳 张师军[1] Zhang Hengyuan;Liu Jianye;Qi Liya;Liu Weilin;Zhang Shijun(Sinopec Beijing Research Institute of Chemical Industry,Beijing 100013,China)

机构地区：[1]中国石油化工股份有限公司北京化工研究院,北京100013

出　　处：《工程塑料应用》2020年第4期31-36,共6页Engineering Plastics Application

摘　　要：将NASICON型无机快离子导体Li1.5Al0.5Ge1.5(PO4)3(LAGP)引入以过滤纤维薄膜为支撑的聚碳酸丙烯酯(PPC)基固态电解质体系中,通过溶液浇铸法制备了一系列不同LAGP含量的PPC/LAGP固态复合电解质,通过力学、热学和电化学方法以及表面形态对其进行了分析和表征。结果表明,以LAGP为锂离子快速传输通道可以显著提高PPC/LAGP固态复合电解质的离子电导率。当LAGP含量为20份时,所制备的PPC/LAGP固态复合电解质的电导率在室温和80℃时分别可达2.07×10–4 S/cm和2.6×10–3 S/cm,锂离子迁移数提升至0.719,同时,拉伸强度显著增加,得到的固态复合电解质综合性能优异。使用等效电路模拟阻抗谱图的曲线,拟合曲线很好地与实验数据重合。Poly(propylene carbonate)(PPC)/Li1.5Al0.5Ge1.5(PO4)3(LAGP)solid composite electrolytes based on PPC with a filter fiber membrane as the frame were prepared in presence of NASICON-type inorganic fast ion conductor LAGP by solution cast technique.The obtained SCPE was analyzed and characterized by mechanical,thermal and electrochemical methods and surface morphology.The results indicate that the ionic conductivity of PPC/LAGP solid composite electrolyte can be significantly improved by the lithium ion fast transfer channels in LAGP.When the content of LAGP is 20 phr,the ionic conductivities of the PPC/LAGP solid composite electrolyte are as high as 2.07×10–4 S/cm and 2.6×10–3 S/cm at room temperature and 80℃,respectively,the lithium ion transference number is increased to 0.719.At the same time,the tensile strength is significantly increased,and the obtained solid composite electrolyte has excellent comprehensive properties.The equivalent circuit is used to simulate the curve of the impedance spectrum,and the fitted curve coincides well with the experimental data.

关 键 词：固态复合电解质 Li1.5Al0.5Ge1.5(PO4)3 聚碳酸丙烯酯 离子电导率 

分 类 号：TM911[电气工程—电力电子与电力传动]