Flexible Metal–Air Batteries

Various inspirational concept and prototype flexible devices such as smart clothes, Samsung bracelet, Apple watch, and LG organic light-emitting diode (LED) TV panel have been proposed and represent promising application directions for future lifestyles. Repeated mechanical deformations are quite common for the flexible battery during practical use, which is most likely to lead to leakage of the conventional liquid electrolyte. According to the solvent property, the flexible polymer electrolytes of metal-air batteries can be divided into two kinds, that is aqueous electrolytes and organic electrolytes. For most applications of flexible metal anodes, pure metal foils and wires are widely used. The Li array anode showed a good flexibility and can bear various deformations such as bending, twisting, and stretching. The conventional cathode is usually prepared from carbon black powder by coating the slurry containing carbon black, additives, and binder onto a metallic current collector.