【摘要】 通过对类聚环氧乙烷(PEO)交联聚合物进行纳米复合改性,制备了3D交联复合结构凝胶聚合物电解质(CGCPE)。详细表征了该电解质膜的微观形貌、物相组成和分子结构等性质,同时深入考察了其离子电导率、锂离子迁移数等基础电化学性能,并完成磷酸亚铁锂准固态锂离子电池组装测试。结果表明,C-GCPE电解质膜具有显著提高的吸液率、离子电导率以及锂离子迁移数。所组装的准固态锂离子电池在2 C电流密度下最高放电比容量达到132.5mAh/g,且容量保持率高达97.2%(循环700圈)。更多还原

【Abstract】 3D cross-linked gel composite polymer electrolyte(C-GCPE) are prepared through the synthesis of a kind of polyethylene oxide(PEO)-like cross-linked polymer combined with the nanocomposite modification technology. The microstructure, phase composition, molecular structure, and basic electrochemical properties such as ionic conductivity and lithium ion migration number of the electrolyte membranes are characterized or investigated in detail. Meanwhile, quasi-solid lithium ion batteries assembled with lithium iron phosphate are tested comprehensively.The results show that the 3D cross-linked composite structure can significantly improve the absorption efficiency of liquid electrolyte, ionic conductivity and lithium ion migration number of the electrolyte membranes. Furthermore,the maximum discharge specific capacity of the quasi-solid lithium ion batteries can reach 132.5 mAh/g, with the capacity retention rate as high as 97.2%(700 cycles at 2 C).更多还原