A Cross-Linked Poly(Ethylene Oxide)-Based Electrolyte for All-Solid-State Lithium Metal Batteries With Long Cycling Stability

A cross-linked poly(ethylene oxide) (PEO)-based electrolyte with polyaryl polymethylene isocyanate (PAPI) as the cross-linking agent is synthesized by a facile one-pot reaction. The PEO chains are PAPI through reaction between hydroxyl groups (−OH) and (−N=C=O). effects of on electrochemical performance PEO-based stability electrolyte/electrode interface investigated. PEO–PAPI has an ionic conductivity 9.3 × 10 –5 −1.3 –4 S cm −1 at 60°C. exhibits enhanced mechanical properties compared to pristine shows good compatibility lithium (Li) metal anode. An all-solid-state Li battery (ASSLMB) optimized LiFePO 4 cathode (1.62 mg −2 in mass loading) discharge capacity 112.8 mAh g after 700 cycles current density 88 μA Even high loading 8.4 , ASSLMB cycle performance. experimental data show that promising candidate for solid electrolytes used ASSLMBs.