机构地区: 青岛科技大学高分子科学与工程学院,山东青岛266042
出 处: 《青岛科技大学学报(自然科学版)》 2017年第4期59-65,共7页
摘 要: 通过添加不同质量分数Al_2O_3纳米粒子制备硅甲氧基封端的聚环氧丙烷为基体的复合凝胶聚合物电解质(纳米Al_2O_3/LiBOB/PC/BSPPO)。采用拉伸测试、差热和热重分析、交流阻抗、线性伏安扫描及极化电流-时间曲线等方法对其进行了力学性能和热性能等物理性能测试以及离子电导率、电化学窗口和离子迁移数等电化学性能测试。研究结果表明:当Al_2O_3纳米粒子质量分数为15%时,该凝胶聚合物电解质室温电导率最佳,达到1.1×10-3 S·cm-1,同时表现出较高的拉伸强度,良好的热稳定性,电化学窗口为4.8 V,离子迁移数为0.61。应用于磷酸铁锂半电池中表现出良好的循环稳定性和倍率性能,说明该复合凝胶聚合物电解质具有潜在的应用和研究价值。 Composite gel polymer electrolyte (nano-Al2O3/LiBOB/PC/BSPPO) with bis [ 3- (methyldimethoxysilyl) propyl]-terminatedpolypropylene glycol as matrix was prepared by adding different mass fraction Al2O3 nanoparticles. The composite electrolyte was characterized by tensile test, DSC, TG, AC impedance, linear scan voltammeter and polarization current-time curve methods. The results showed that as-prepared nano-Al2O3/BSPPO composite gel polymer electrolyte possessed high tensile strength and good thermal stability. In addition, it delivered high ion conductivity of 1.1 × 10^-3S · cm-1 at room temperature, wide electrochemical window of 4.8 V as well as high ion transference number of O. 61, when the mass fraction of nano-Al2O3 was 15 %. When it coupled with LFP cathode, the battery exhibited good cyclic stability and rate capability, validating itsr potential value for research and practical application.