Liu Xiaoli, Zhan Yu, Zhao Chenying, Su Yuefeng, Ge Zhen, Luo Yunjun
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
Polymers (Basel). 2020 Jul 8;12(7):1513. doi: 10.3390/polym12071513.
Ionic liquid has relatively high conductivity at room temperature and good electrochemical stability. Ionic liquid polymer electrolytes have some advantages of both ionic liquid and polymer. In this work, 1-alkyl-3-(2',3'-dihydroxypropyl)imidazolium chloride (IL-Cl) was incorporated into waterborne polyurethane chain to composite all-solid-state polymer electrolyte matrices. The structure, thermal stability, mechanical property and ionic conductivity of the matrices were investigated by Fourier transform infrared spectroscopy (FTIR), thermogravimetric Analysis (TGA), tensile measurement and electrochemical impedance spectroscopy (EIS). The results demonstrated that when the content of IL-Cl was 14 wt%, the mechanical property of film was optimized, with a maximum tensile strength of 36 MPa and elongation at break of 1030%. In addition, as for the film with IL-Cl content of 16 wt%, its oxygen index value increased to 25.2% and ionic conductivity reached a maximum of 1.2 × 10 S·cm at room temperature, showing high flame retardancy and ionic conductivity.
离子液体在室温下具有较高的电导率和良好的电化学稳定性。离子液体聚合物电解质兼具离子液体和聚合物的一些优点。在本工作中，将1-烷基-3-(2',3'-二羟丙基)咪唑鎓氯化物（IL-Cl）引入水性聚氨酯链中，以复合全固态聚合物电解质基体。通过傅里叶变换红外光谱（FTIR）、热重分析（TGA）、拉伸测试和电化学阻抗谱（EIS）对基体的结构、热稳定性、力学性能和离子电导率进行了研究。结果表明，当IL-Cl含量为14 wt%时，薄膜的力学性能得到优化，最大拉伸强度为36 MPa，断裂伸长率为1030%。此外，对于IL-Cl含量为16 wt%的薄膜，其氧指数值提高到25.2%，室温下离子电导率达到最大值1.2×10 S·cm，表现出高阻燃性和离子电导率。
