Ultra-long cycle life of lithium metal anode achieved by fluoride silane artificial layer

Abstract

To overcome the major problem of an unstable solid electrolyte interphase (SEI) layer resulting from uncontrollable Li dendritic growth and volume changes of Li metal anodes, a fluoride silane coating is fabricated. This coating features methoxyl functional groups that interact with LiOH on the Li substrate to form evenly distributed Li-O-Si bonds. The cross-linked Si-O-Si bonds, along with the fluorine functional groups and LiF, collaborate to promote a uniform and compact lithium deposition. The coated lithium metal anode exhibits a stable voltage curve for 1800 h at 3 mA cm−2.