Competitive Coordination and Dual Interphase Regulation of MOF‐Modified Solid‐State Polymer Electrolytes for High‐Performance Sodium Metal Batteries

Abstract Solid‐state polymer electrolytes (SPEs) have emerged as prominent candidates for solid‐state sodium metal batteries (SMBs) due to their enhanced flexibility and reduced interfacial resistance. However, their performance is limited by poor Na + conductivity at room temperature, disordered ion transport properties and unstable interfaces. Herein, a three‐dimensional (3D) interconnected copper metal–organic framework (Cu‐MOF) on polyacrylonitrile (PAN) fibers is introduced into polyethylene oxide (PEO)‐based SPEs to construct a composite electrolyte (PPNM). The open metal sites (OMS) of the Cu‐MOF compete with Na + , effectively coordinating with TFSI − anions and oxygen atoms in PEO, thereby reducing…

• NS
  Natural Science Foundation of Tianjin City

  Award: 22JCZDJC00170, 22JCYBJC00770, 24ZXZSSS00390