A novel PMA/PEG-based composite polymer electrolyte for all-solid-state sodium ion batteries

摘要

In recent years,development of all-solid-state batteries has become a promising approach to improve the safety of batteries.Herein,we report the preparation of a new composite polymer electrolyte (CPE)for use in all-solid-state sodium ion batteries.The CPE comprising of poly(methacrylate)(PMA),poly(ethylene glycol)(PEG),α-Al2O3 with acidic surface sites,and NaClO4 exhibited high ionic conductivity (1.46×10^-4 S·cm^-1 at 70℃),wide electrochemical stability window (4.5V vs.Na+/Na),and good mechanical strength.With the introduction of the prepared CPE and Na3V2(PO4)3,the final all-solid-state sodium ion batteries showed good rate and cycle performance,with a high reversible capacity of 85mAh·g^-1 when operated at 0.5C (1C=118mA·g^-1)and 94.1%capacity retention rate after 350cycles at 70℃.Our work provides a novel solid electrolyte for the development of all-solid-state sodium ion batteries.