P(MMA-VAc-LiAA)聚合物电解质的制备及表征

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LiClO_4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~(-3)S/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.

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

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 FTIR, XRD, DSC/TG, and SEM.The polymer electrolytes was prepared by blending P(MMA-VAc-LiAA)and LiClO_4 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~(-3)S/cm 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(MMA-VAc) improved the contraction and mechanical properties of membrane, which meeted the existing requirements of lithium-ion battery.