P(MMA-VAc-LiAA)聚合物电解质的制备及表征

Preparation and characterization of electrolytes based on P(MMA-VAC-LIAA)

以甲基丙烯酸甲酯(MMA)、醋酸乙烯酯(VAc)和丙烯酸锂(LiAA)为单体,采用种子乳液聚合法制备了(P(MMA-VAc-LiAA)三元共聚物。利用红外光谱(FTIR),核磁共振(1HNMR),差示扫描量热(DSC)/热重分析(TG),X射线衍射(XRD),扫描电镜(SEM)等方法对聚合物的结构进行了表征。将P(MMA-VAc-LiAA)与LiClO4共混,采用流延法制备了聚合物电解质膜,用交流阻抗方法测试了电解质膜的电导率,结果表明,该聚合物电解质室温离子电导率可以达到10-3S/cm。而且离子电导率随着温度的升高而迅速增加,电导率-温度曲线符合Arrhenius方程。机械性能测试结果表明,在P(MMA-VAc)的基础上,引入第三单体LiAA可以改善膜的收缩性与力学性能。

The ternary copolymer polymethyl methacrylate-vinyl acetate-lithiumacrylate P （MMA-VAc-LiAA） was synthesized by seeded radical emulsion polymerization, with methyl methacrylate （MMA）, vinyl acetate （VAc） and lithiumacrylate （LiAA） as monomers. The performances of the polymer were characterized by FT- IR, XRD, DSC/TG, and SEM. The polymer electrolytes was prepared by blending P（MMA-VAc-LiAA）and LiClO4 with solution casting technique. The ionic conductivity of the electrolyte membrane was tested by AC impedance, which demonstrated that the ionic conductivity of polymer electrolytes was as high as 10^-5S/era at room temperature. And the ionic conductivity increased with increasing temperature, the conductivity-temperature plots were found to follow an Arrhenius nature. The introduction of the third monomer LiAA to P（MMAVAc） improved the contraction and mechanical properties of membrane, whieh meeted the existing requirements of lithium-ion battery.