Abstract: 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.

Key words: Lithium ion battery, Polymer electrolyte, PMMA, Ethylene carbonatedimethyl carbonate(EC-DMC)