Anion-Immobilized and Fiber-Reinforced Hybrid Polymer Electrolyte for Advanced Lithium-Metal Batteries

3D-skeleton-reinforced hybrid polymer electrolytes (HPEs) are conducive to improving the electrochemical performance and mechanical strength, but their preparation methods are usually tedious and inappropriate for practical application. The simplification of the preparation process and the further optimization of 3D skeletons are urgent to develop high-performance solid-state batteries. In this work, glass fiber (GF) decorated with ZIF-67 (GF@ZIF-67) was originally selected as 3D skeleton to construct an anion-immobilized and fiber-reinforced polyethylene oxide (PEO)-based HPE (GF@ZIF@PEO). The presence of GF@ZIF-67 3D skeleton can enhance the mechanical strength, whereas Lewis-acidic metal sites of ZIF-67 can immobilize free anions of the polymer matrix, accelerating ion migration and facilitating long-term cycling stability. Consequently, the assembled LiFePO4/Li solid-state batteries delivered a reversible capacity of 132 mAh g(-1)with the capacity retention of 92 % at 1 C after 200 cycles. Our universal approach paves the way for advanced solid-state electrolytes.