Ultrathin, Flexible, Solid Polymer Composite Electrolytes for High Performance and Safe Lithium Batteries

Safety issues in lithium-ion batteries have recently raised serious concerns. Replacing flammable liquid electrolytes, solid-state electrolytes (SSEs) are thought to address this issue and provide unmatched energy densities in Li-based batteries. Here, we demonstrated the design of a ultralightweight and fireproof polymer−polymer SSE. Strategies in enhancing ionic conductivity and Li dendrite suppression properties in ultrathin SSEs will be discussed. The whole SSE is made from organic materials, with a thin, tunable thickness (10−25 μm), which endorse the energy density at least comparable to conventional Li-ion batteries.