All Solid-State Lithium-Polymer Battery Using a Self-Cross-Linking Polymer Electrolyte

A self-cross-linking polymer electrolyte based on polystyrene-incorporated poly(ethylene oxide) (PEO) containing LiTFSI has been tested in an all solid-state lithium-polymer battery with a solid polymer electrolyte. The polymer electrolyte showed high stability toward metallic lithium. Mechanical properties of the electrolyte film were much improved by incorporating the polystyrene, but ion conductivity was decreased to half of the value obtained in pure PEO electrolyte film. The cell was charged and discharged at a high temperature (80°C), providing about 80% utilization of the positive electrode. The cell showed good cycle life at 80°C, keeping 90% of the initial capacity after 50 cycles.