Progress in Gel Polymer Electrolytes for Sodium‐Ion Batteries

Sodium-ion battery is a potential application system for large-scale energy storage due to the advantage of higher nature abundance and lower production cost sodium-based materials. However, there exist inevitably safety problems such as flammability use same type organic liquid electrolyte with lithium-ion battery. Gel polymer electrolytes are being considered an effective solution replace conventional building safer sodium-ion batteries. In this review paper, authors present comprehensive overview research progress in electrochemical physical properties gel electrolyte-based sodium The based on different hosts namely poly(ethylene oxide), poly(acrylonitrile), poly(methyl methacrylate), poly(vinylidene fluoride), fluoride-hexafluoro propylene), other new networks summarized. ionic conductivity, ion transference number, window, thermal stability, mechanical property, interfacial issue electrodes electrolytes, corresponding influence factors described detail. Furthermore, transport pathway conduction mechanism analyzed discussed. addition, advanced systems including flame-retardant composite copolymerization, single-ion conducting etc. more superior functional performance classified Finally, prospects, development opportunities, remaining challenges, possible solutions