Abstract
Herein, polymer electrolytes (PEs) were designed and fabricated through lithium salt-induced in situ living radical copolymerization of poly(ethylene glycol) methacrylate (PEGMA) and various (meth)acrylates monomers (methyl methacrylate (MMA), n-butyl acrylate (BA), n-butyl methacrylate (BMA), or styrene) with 18-crown-6-ether (18CE6) as both the solvent of copolymerization and the plasticizer of PEs. The lithium salt plays a dual role of activator for alkyl halides (R–X, X = Br or I) initiators, and lithium-ion source. The polymer electrolyte in situ formed in the Li/LiFePO₄ cell with a cellulose membrane showed excellent compatibility with electrode materials. The Li/P(PEGMA-co-MMA)-based PE/LiFePO₄ cell possessed an initial discharge capacity of 166.5 mAh g–¹ at 0.2C and maintained a capacity of 155.3 mAh g–¹ at 0.2C after 290 cycles. The lithium salt-induced in situ polymerization offers a new strategy toward polymer electrolytes for high-performance lithium-ion batteries.
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