AgF预处理稳定化锂负极及其在锂氧气电池中的应用

Lithium anode stabilization via AgF pretreatment and its application in a Li-oxygen battery

目前,金属锂负极的稳定性是限制锂氧气电池发展的一大难题。由此,构筑人工固态电解质(SEI)膜保护金属锂因具有效果明显、可自修复、易于实现等优点而受到广泛关注。本工作利用AgF在二甲亚砜溶剂中可溶解,且可以被金属锂还原为不溶物表面膜的特性,通过AgF溶液对金属锂进行预处理,可在锂负极表面原位生成一层基于LiF/Ag的人工SEI膜。该SEI膜能够有效抑制锂枝晶的生长,提高锂负极的循环稳定性,将锂氧气电池的循环寿命延长4倍。

The stability of Li-metal anodes seriously limits the development of Li-oxygen batteries(LOBs). An artificial solid electrolyte interface(SEI) film constructed on Li is effectively protective,self-healing, and easily achievable. In this work, an artificial SEI film based on LiF/Ag was formed in situ on the surface of the Li-metal anode by a facile pretreatment with silver fluoride(AgF) solution.The film significantly suppressed the growth of Li-dendrites, improved the stability of Li-metal anodes,and prolonged the cycle life of the LOB more than fourfold.