Abstract: A star-shaped gel polymer electrolyte was synthesized by blocking diethylene glycol dimethylacrylate into olefine acid ester with polyhydroxy groups. Electrochemical properties of the gel electrolyte and battery were studied with cyclic voltammogram，AC impedance and XRD. Results showed that the block of diethylene glycol dimethylacrylate can improve the properties of gel polymer electrolyte，which exhibits 1.89 mS/cm of ionic conductivity at room temperature with a small dosage. The polymer battery displays excellent rate performance with impedance of 110 Ω and capacity maintenance ratio of 96% after 50 cycles. The block copolymer can reduce the activation energy of ionic conduction by disarranging the polymer structure and expanding the space between branches.

摘要： 将二-乙二醇甲基丙烯酸酯嵌入多羟基醇的烯酸酯中，制备嵌段星形凝胶聚合物电解质，用循环伏安、交流阻抗、X射线衍射等研究电解质和聚合物电池的性质。结果表明，二-乙二醇甲基丙烯酸酯的嵌入可明显改善凝胶的性能，获得的电解质黏性好，室温电导率为1.89 mS/cm，单体用量少；以此制备的聚合物电池界面阻抗为110 W，50次循环后容量保持率达到96%，倍率放电能力优良。二-乙二醇甲基丙烯酸酯的嵌入扩展了聚合物链间的空间，降低了分子的规整性，减小了离子迁移活化能。