全固态锂离子电池用金属有机框架及交联型电解质的研究

发布时间：2018-05-09 18:30

  本文选题：全固态锂离子电池 + 固体电解质　； 参考：《中南大学》2014年硕士论文

【摘要】：摘要：传统锂离子电池由于使用易挥发、易燃的电解液,存在严重的安全隐患。使用固体电解质的锂离子电池在改善安全性能的同时还能实现外形多样化加工。本文合成了一种金属有机框架MOF-5多孔材料,作为聚氧乙烯(PEO)基固体电解质的填料。另外,制备了一种类PEO交联型固体电解质。基于这两种电解质,组装了全固态锂离子电池。主要结果如下： 1.X射线衍射和扫描电镜结果表明,使用滴加溶剂热法和直接溶剂热法分别合成了微米级多孔MOF-5材料。激光粒度分析结果表明,使用滴加溶剂热法制备的MOF-5粒度分布明显窄于直接溶剂热法。基于MOF-5为填料的PEO固体电解质LiFePO4/Li电池在80℃及1C倍率下,首次放电比容量为110mAhg-1,循环120圈后,放电比容量为98.5mAhg-1。 2.通过Y-缩水甘油醚氧丙基三甲氧基硅烷中的甲氧基和聚乙二醇(分子量600)中的羟基反应形成了交联型固体聚合物。将该聚合物与双(三氟甲基磺酰)亚胺锂经过物理共混,然后热压成半透明状固体电解质薄膜。当氧乙烯单元(EO)：Li=20：1时,该电解质在25℃的电导率为3.15×10-5S cm-1,分解温度为300℃。使用该电解质组装的LiFePO/Li电池在80-140℃之间具有良好的倍率循环性能。在120℃时,电池1C循环的初始放电比容量和100圈后放电比容量分别为157mAhg-1和92.8mAh g-1.
[Abstract]:Abstract: because of the volatile and flammable electrolyte, the traditional lithium ion battery has serious safety problems. Lithium ion batteries using solid electrolytes can improve safety performance and can be processed in a variety of shapes at the same time. In this paper, a metal-organic framework MOF-5 porous material was synthesized as a filler for polyoxyethylene oxide (PEO-based)-based solid electrolytes. In addition, a kind of PEO crosslinked solid electrolyte was prepared. Based on these two electrolytes, all solid state lithium ion batteries were assembled. The main results are as follows: 1. The results of X-ray diffraction and scanning electron microscopy show that micrometer porous MOF-5 materials have been synthesized by drop addition solvothermal method and direct solvothermal method, respectively. The results of laser particle size analysis show that the particle size distribution of MOF-5 prepared by drop addition solvothermal method is obviously narrower than that of direct solvothermal method. The first discharge specific capacity of PEO solid electrolyte LiFePO4/Li battery based on MOF-5 was 110 mAhg-1 at 80 鈩，

本文编号：1866950