Ultralong-life lithium metal batteries enabled by decorating robust hybrid interphases on 3D layered framworks

Abstract

Stable solid-electrolyte interphase (SEI) is crucial for advanced development of lithium metal batteries. However, the continuous collapse and reconstruction of SEI will deplete fresh Li and electrolytes upon cycling, leading to irreversible capacity loss. Herein, we addressed this issue by pre-formation of artificial robust hybrid interphase on a 3D layered graphene/lithium metal framework, in which is constructed by LiF associated with Li2TiF6 generated by the in-situ reaction between the surfacial lithium and titanium fluoride contained electrolytes. The as-obtained interphase can maintain the structure integrality and avoid continuous consumption of the fresh Li and electrolytes. As a consequence, the Li symmetric cells achieve high-efficiency Li deposition and stable cycling over 3600 h. When paired with LiFePO4 cathodes, the coin cells exhibit long lifespan (>800 cycles) with almost 88.3% retention of the initial capacity.