Designing Polymer‐in‐Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid‐State Lithium Batteries

A PVDF-HFP-based polymer-in-salt solid electrolyte (PISSE) with high ionic conductivity at room temperature and a solid-state lithium battery (SSLB) with 3D fully infiltration of PISSE is developed. The integrated device achieves maximized interfacial contact and electrochemical and mechanical stability, presenting high performance close to that with liquid electrolyte.