State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
Adv Mater. 2018 Jan;30(3). doi: 10.1002/adma.201704378. Epub 2017 Dec 1.
The Li-air battery represents a promising power candidate for future electronics due to its extremely high energy density. However, the use of Li-air batteries is largely limited by their poor cyclability in ambient air. Herein, Li-air batteries with ultralong 610 cycles in ambient air are created by combination of low-density polyethylene film that prevents water erosion and gel electrolyte that contains a redox mediator of LiI. The low-density polyethylene film can restrain the side reactions of the discharge product of Li O to Li CO in ambient air, while the LiI can facilitate the electrochemical decomposition of Li O during charging, which improves the reversibility of the Li-air battery. All the components of the Li-air battery are flexible, which is particularly desirable for portable and wearable electronic devices.
锂空气电池因其极高的能量密度，有望成为未来电子产品的理想电源。然而，由于其在环境空气中的循环稳定性差，锂空气电池的应用受到了很大的限制。本文通过结合低密度聚乙烯膜（可防止水侵蚀）和含有氧化还原介质碘化锂的凝胶电解质，制备了具有超长循环寿命（610 次）的锂空气电池。在环境空气中，低密度聚乙烯膜可以抑制放电产物 LiO 与 LiCO 的副反应，而 LiI 可以促进充电过程中 LiO 的电化学分解，从而提高锂空气电池的可逆性。锂空气电池的所有组件均具有柔韧性，这对于便携式和可穿戴电子设备而言尤为理想。
