A Composite Solid-state Polymer Electrolyte for Solid-state Sodium Batteries [基于复合固体聚合物电解质的固态钠电池]

作者：Zhang Q.; Su X.; Lu Y.^*; Hu Y.

来源：Journal of the Chinese Ceramic Society, 2020, 48(7): 939-946.

DOI：10.14062/j.issn.0454-5648.20200066

• Composite polymer electrolyte
• Poly(ethylene oxide)
• Sodium batteries
• Sodium bis(trifluoromethanesulfonyl)imide
• Solid-state polymer electrolyte

An organic-inorganic composite polymer electrolyte (CPE) was constructed via introducing an active filler of Na-β''-Al2O3 into a solid-state polymer electrolyte (SPE) composed of poly(ethylene oxide) (PEO) and sodium bis(trifluoromethanesulfonyl)-imide (NaTFSI). The phase composition, ionic conductivity, Na+ transference number, and electrochemical stability were investigated. The electrochemical properties of SPE and CPE in NaNa3V2(PO4)3@C solid-state sodium batteries were obtained. The results show that the CPE has a greater Na+ transference number of 0.71 than SPE (i.e., 0.19) and a higher Na+ conductivity of 8.19×10-4S/cm than SPE (i.e., 1.65×10-4 S/cm) at 80℃. The CPE exhibits a superior cycling stability with capacity retentions of 93.9% after 100 cycles at 0.5C and 74.0% after 500 cycles at 2.0C in NaCPENa3V2(PO4)3@C solid-state batteries.

• 单位
  中国科学院大学