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Flexible Rechargeable Zinc-Air Battery with Excellent Low-Temperature Adaptability.

Flexible zinc-air battery (ZAB) is a promising battery candidate for emerging flexible electronic devices, but the catalysis-based working principle and unique semi-opened structure pose a severe challenge to its overall performance at cold temperature. Herein, we report the first flexible rechargeable ZAB with excellent low-temperature adaptability, based on the innovation of an efficient electrocatalyst to offset the electrochemical performance shrinkage caused by decreased temperature and a highly conductive hydrogel with a polarized terminal group to render the anti-freezing property. The fabricated ZABs show excellent electrochemical performances that outperform those of many aqueous ZABs at room temperature. It also delivers a high capacity of 691 mAh g-1 and an energy density of 798 Wh kg-1 at -20 °C  (92.7% and 87.2 % retention of the room temperature counterparts, respectively), together with excellent flexibility and reverting capability, thereby epitomizing state-of-the-art performance for flexible ZABs at low temperature.