Polyethylene-supported poly(acrylonitrile-co-methyl methacrylate)/nano-Al2O3 microporous composite polymer electrolyte for lithium ion battery

Nano-Al2O3 was doped in poly(acrylonitrile-co-methyl methacrylate) (P(AN-co-MMA)), and polyethylene(PE)-supported P(AN-co-MMA)/nano-Al2O3 microporous composite polymer electrolyte (MCPE) was prepared. The performances of the prepared MCPE for lithium ion battery use, including ionic conductivity, electrochemical stability, interfacial compatibility, and cyclic stability, were studied by scanning electron spectroscopy, linear sweep voltammetry, and electrochemical impedance spectroscopy. It is found that the nano-Al2O3 significantly affects the MCPE performances. Compared to the MCPE without any nano-Al2O3, the MCPE with 10 wt.% nano-Al2O3 reaches its best performances. Its ionic conductivity is improved from 2.0 x 10(-3) to 3.2 x 10(-3) S cm(-1), its decomposition potential is enhanced from 5.5 to 5.7 V (vs Li/Li+), and its interfacial resistance on lithium is reduced from 520 to 160 Omega cm(2). Thus, the battery performance is improved.