Strong Lewis Acid-base and Weak Hydrogen Bond Synergistically Enhancing Ionic Conductivity of Poly (ethylene oxide)@SiO2 Electrolytes for High Rate-capability Li-metal Battery

The solid-state composite polymer electrolytes (CPEs) usually suffered from the intrinsic low ionic conductivity and solid-solid interface, badly inhibiting its widely commercial application in all solid-state Li-metal batteries (ASSLMBs) energy storage. Herein, a synergetic strategy of strong Lewis acid-base and weak hydrogen bond was employed for self-assembly in-situ construction of three-dimensional (3D) network structured poly (ethylene oxide) (PEO) and SiO2 CPEs (PEO@SiO2). Ascribing to this synergistically rigid-flexible coupling dynamic strategy, a harmonious incorporation of monodispersed SiO2 nanoparticles into the PEO could remarkably reduce crystallinity of PEO, significantly enhancing the ionic conductivity (~1.1×10−4 S cm−1 at 30 °C) and dramatically facilitating solid electrolyte interface stabilization (electrochemical stability window > 5 V at 90 °C). Moreover, the PEO@SiO2 based ASSLMBs possess the excellent rate-capability over a wide temperature range (~105 mAh g−1 under 2 C at 90 °C),...