Fiber‐Reinforced Ultrathin Solid Polymer Electrolyte for Solid‐State Lithium‐Metal Batteries

Abstract Reducing the thickness of solid polymer electrolytes can help to enhance the energy density for solid‐state batteries. However, ultrathin electrolytes still face difficulties in preparation methods, mechanical properties, and interface instability. Herein, a free‐standing, scalable, and ultrathin solid polymer electrolyte with a thickness of 10 µm is reported. It is achieved through in situ thermal curing after filling a porous electrospun polyacrylonitrile fiber membrane with poly(ethylene glycol) diacrylate‐based electrolyte. Impressively, it contributes to a high ionic conductivity of 8.8 × 10 −4 S cm −1 at room temperature. The membrane can not only provide good mechanical strength but also offer…

• NS
  Natural Science Foundation of Shanghai

  Award: 24ZR1451200
• NN
  National Natural Science Foundation of China

  Awards: 92472119, 52222311