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Alkaline Polymer Membrane-Based Ultrathin, Flexible, and High-Performance Solid-State Zn-Air Battery

机译：碱性聚合物膜超薄，柔性，高性能固态锌空气电池

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摘要

The increasing demand for portable and wearable electronics requires lightweight, thin, and highly flexible power sources, for example, flexible zinc-air batteries (ZABs). The so-far reported flexible ZAB devices mostly remain bulky, with a design consisting of two relatively thick substrates (e.g., carbon cloths and/or metal foams) and a gel electrolyte-coated separator in between. Herein, an ultrathin (approximate to 0.2 mm) solid-state ZAB with high flexibility and performance is introduced by directly forming self-standing active layers on each surface of an alkaline polymer membrane through an ink-casting/hot-pressing approach. A Fe/N-doped 3D carbon with hierarchic pores and an interconnected network structure is used as cathode electrocatalyst, so that the backing gas-diffusion layer (e.g., carbon cloth) can be abandoned. What is further, a microstructure-modulating method to significantly increase the FeN4 active sites for oxygen reduction reaction is developed, thus significantly boosting the performance of the ZAB. The assembled solid-state ZAB manifests remarkable peak power density of 250 mW cm(-3) and high capacity of 150.4 mAh cm(-3) at 8.3 mA cm(-3), as well as excellent flexibility. The new design should provide valuable opportunity to the portable and wearable electronics.
机译：对便携式和可穿戴电子产品的需求不断增长，需要轻便，薄型和高度灵活的电源，例如，灵活的锌空气电池（ZAB）。迄今报道的柔性ZAB装置大部分仍然是笨重的，其设计由两个相对较厚的基底（例如，碳布和/或金属泡沫）和介于两者之间的凝胶电解质涂覆的隔板组成。在此，通过通过注墨/热压方法在碱性聚合物膜的每个表面上直接形成自支撑活性层，从而引入了具有高挠性和性能的超薄（约0.2mm）固态ZAB。具有层状孔和互连网络结构的Fe / N掺杂3D碳被用作阴极电催化剂，因此可以放弃衬里气体扩散层（例如碳布）。此外，开发了显着增加用于氧还原反应的FeN4活性位点的微结构调节方法，从而显着提高了ZAB的性能。组装好的固态ZAB表现出250 mW cm（-3）的峰值功率密度和在8.3 mA cm（-3）时的150.4 mAh cm（-3）的高容量，以及出色的柔韧性。新设计应为便携式和可穿戴电子设备提供宝贵的机会。

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