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以聚乙二醇(PEG)、有机硅氧烷(OFX)、异佛尔酮ニ异氰酸酯(IPDI)为主要原料,制备了一系列水性聚氨酯,并与双(三氟甲基磺酰)亚胺锂(LiTFSI)复合,得到一系列全固态聚合物薄膜。通过拉伸性能测试、红外光谱、热重分析和电导率测试等研究了其结构与性能的关系。将制备的聚合物电解质膜用于全固态锂离子电池的组装,测试了电池的性能。结果表明:适量引人有机硅氧烷可改善聚合物电解质膜的力学性能和电化学性能;当PEG与有机硅氧烷质量比为3:1时聚合物电解质膜的综合性能最佳,80℃时电导率为6.24×10~(-4)S/cm;以磷酸铁锂为正极制备的全固态锂离子电池在0.2C电流80℃时放出131 mA·h/g的比容量。
A series of water-borne polyurethanes were prepared by using polyethylene glycol (PEG), organosiloxane (OFX) and isophorone diisocyanate (IPDI) as the main raw materials, and reacted with bis (trifluoromethylsulfonyl) imide Lithium (LiTFSI) composite, a series of all-solid polymer films. The relationship between structure and properties was studied by tensile testing, infrared spectroscopy, thermogravimetry and conductivity testing. The prepared polymer electrolyte membrane was used in the assembly of all-solid-state lithium-ion battery, and the performance of the battery was tested. The results showed that proper amount of organosiloxane could improve the mechanical and electrochemical properties of the polymer electrolyte membrane. When the mass ratio of PEG to organosiloxane was 3: 1, the polymer electrolyte membrane exhibited the best performance at 80 ℃ When the current density is 6.24 × 10 ~ (-4) S / cm. All-solid-state lithium ion battery prepared with lithium iron phosphate as the positive electrode emits a specific capacity of 131 mA · h / g at a current of 80 ℃.