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

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 -Al 2 O 3 with acidic surface sites, and NaClO 4 exhibited high ionic conductivity (1.46 × 10 -4 S·cm -1 at 70 °C), wide electrochemical stability window (4.5 V vs. Na + /Na), and good mechanical strength. With the introduction of the prepared CPE and Na 3 V 2 (PO 4 ) 3 , the final all-solid-state sodium ion batteries showed good rate and cycle performance, with a high reversible capacity of 85 mAh·g -1 when operated at 0.5 C (1 C = 118 mA·g –1 ) and 94.1% capacity retention rate after 350 cycles at 70 °C. Our work provides a novel solid electrolyte for the development of all-solid-state sodium ion batteries.