摘要由于比能量高、绿色环保、循环性好等特点，锂离子电池渐入人们的研究视野。但是传 统锂离子电池使用的是液态电解质，往往存在液体泄漏，导致使用过程中存在安全隐患。凝 胶聚合物电解质具有良好的热稳定性和机械强度，同时电解质能够很好的保持在凝胶中，很 大程度上避免了电解质的泄露，从而提高电池的安全性能。本课题在偏氟乙烯-六氟丙烯共 聚物 P(VDF-co-HFP)和离子液体(1-乙烯基-3-丁基咪唑双三氟磺酸亚氨盐[EBIm][TFSI-])聚 合物凝胶电解质的基础上，通过电子束辐照技术，成功制备得到一系列增强型聚合物凝胶电 解质。并通过 X 射线衍射仪(XRD)、万能试验机、红外光谱仪(FTIR)和电化学工作站等设备 对材料的性能进行测试表征。结果表明，当聚合物和离子液体配比为 1:4，电子束辐照吸收 剂量为 45kGy 时，材料的机械性能和离子导电性能最佳，断裂伸长率达到 167%，断裂强度 为 0。47MPa，离子导电为 0。2mS/cm。88620

毕业论文关键词：锂离子电池； 凝胶聚合物电解质； 离子电导率；机械强度

Abstract Due to the advantages such as high energy density, good environmental protection and good circulation characteristics,lithium-ion battery has been widely used in our daily life。 However, traditional lithium-ion battery exists safety problem while in use because the electrolyte of it is usually liquid organic electrolyte and it could cause liquid leakage, which increases the risk of explosion。 To solve this problem, we can use the gel polymer electrolyte instead of the traditional electrolyte because of its excellent thermal stability and mechanical strength。In addition, the electrolyte will remain in the gel well ,which can avoid the liquid leakage。 In this paper, we use P(VDF-co-HFP)and the ionic liquid [EBIm][TFSI-] to make gel electrolyte membranes and we intend to improve the ionic conductivity and mechanical strength by electron beam co-irradiation grafting method。 To characterize the properties of polymer electrolytes, we have used the method including X-ray diffraction (XRD), tensile test, infrared spectroscopy (FTIR) to characterize the properties of polymer electrolytes。 On the basis of the studies above, we can draw the conclusion that with 45kGy absorbed dose, when the ratio is 1:4, the polymer electrolytes can get the best characteristic: elongation at break is 167%; Tensile strength at break  is 0。47MPa;Ionic conductivity reached 0。2mS/cm。源Q于D优G尔X论V文Y网wwW.yOueRw.com 原文+QQ75201`8766

Keywords: Lithium-ion batteries; Gel Polymer electrolyte; Ionic conductivity; mechanical strength

目 录

摘 要 i

前 言 1

1。锂离子电池(lithium-ion battery) 1

1。1 概述 1

1。2 锂离子电池的工作原理 1

2。电解质 2

2。1 概述 2

2。2 常规电解质 2

2。3 聚合物电解质的性能和分类 2

3。辐照技术及其应用 5

3。1 辐照技术 5

3。2 辐照技术的应用 5

4。课题选择 5

实验部分 7

1。实验原料 7

2。实验设备 7

3。实验过程