| 摘 要： | 1 Results Gel polymer electrolytes for lithium battery have been widely investigated recently because of their high ion conductivity at room temperature. We synthesized and characterized novel gel electrolytes based on amphiphilic copolymethacrylates containing different lengths of ethylene oxide (EO) chain as ionophilic units and methyl methacrylate (MMA) chain as ionophobic units1]. Their electrochemical properties were also measured.1H NMR and FTIR analysis results elucidated that PEG-b-glycidyl methacrylate (GMA) was synthesized successfully via cationic ring-opening polymerization.The GPC results showed that the PGMA block contained 5-8 monomer units, which enabled the crosslinking of the copolymer with MMA. An amphiphilic polymer gel electrolyte based on PEG-b-GMA-co-MMA was obtained by doping the copolymer with liquid lithium electrolyte (DMC∶DEC∶EC = 1∶1∶1 (W/W) LiPF6 1.0 mol/L). Electrochemistry tests suggested that the new polymer electrolyte exhibited a high ionic conductivity at room temperature, and an Arrenius-like behaviour of the conductivity was observed.
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