Metal Organic Framework\n(MOF-808) Incorporated Composite\nPolymer Electrolyte for Stable All-Solid-State Lithium Batteries

All-solid-state lithium-ion batteries (ASSBs) are emerging\nas promising\ncandidates for power applications in electric vehicles and various\nenergy storage systems, garnering significant research interest. However,\nenhancing the Li<sup>+</sup> conductivity and stability of polymer\nelectrolyte has been a persistent challenge in the field. This work\ndemonstrates a novel approach to fabricating a composite polymer electrolyte\n(CPE) with uniformly dispersed porous MOF-808 particles in a poly(ethylene\noxide) (PEO) matrix mixed with LiTFSI salt. The resulted CPE exhibits\na 20-fold increase in ion conductivity (9.7 × 10<sup>–4</sup> S cm<sup>–1</sup> at 60 °C) and an expanded electrochemical\nwindow up to 4.8 V. The assembled ASSBs with LiFePO<sub>4</sub> cathodes\nand Li metal anodes under 50 MPa pressure show good specific capacity\n(140.3 mAh g<sup>–1</sup>) and excellent cycling stability\n(93.5% capacity retention). This CPE has also demonstrated excellent\ncompatibility with the high-voltage cathode material NCM811, exhibiting\nsuperior electrochemical stability. Results of this work highlight\nthe use of MOF materials in CPE, advancing the development of next-generation\nsolid-state batteries.