新型PMMA基聚合物电解质的研制

Research on Novel PMMA-based Gel Electrolyte for Lithium Ion Battery

制备了聚甲基丙烯酸甲酯(PMMA)基聚合物电解质,通过加入交联剂使其形成网状结构,提高了聚合物电解质的机械性能.对MMA以及交联剂的含量作了优化,并测试了聚合物电解质的温度特性.测试结果表明,MMA、EGD(二甲基丙烯酸乙二醇酯)和电解液(LiBF4/EC-DMC)含量分别为25%、2%、73%(质量分数)时,所制备的聚合物电解质具有较高的电导率,室温条件下可以达到2×10-3S·cm-1,电化学窗口为4.8V.用其作为电解质组装的聚合物锂离子电池具有较好的充放电性能.

Novel PMMA based electrolyte cross linked by ethylene glycol dimethacrylate(EGD) for lithium ion battery is prepared. As the network structure, the mechanical property of the gelled electrolyte is improved. The content of methyl methacrylate(MMA) and EGD are optimized, and the temperature dependence of conductivity is investigated. The conductivity reaches 2×10-3 S·cm-1 in the polymer electrolyte containing 25%MMA, 2% EGD and 73% LiBF4 (mass fraction) in ethylene carbonate(EC)/dimethyl carbonate(DMC) at room temperature, and the electrochemical stability window is about 4.80 V versus lithium. The polymer lithium ion battery with gelled PMMA based electrolyte exhibits good electrochemical property.