Flexible High-Energy Polymer-Electrolyte-Based Rechargeable Zinc-Air Batteries

A thin‐film, flexible, and rechargeable zinc–air battery having high energy density is reported particularly for emerging portable and wearable electronic applications. This freeform battery design is the first demonstrated by sandwiching a porous‐gelled polymer electrolyte with a freestanding zinc film and a bifunctional catalytic electrode film. The flexibility of both the electrode films and polymer electrolyte membrane gives great freedom in tailoring the battery geometry and performance.