Ultralong-Life Lithium Metal Anodes Enabled by Decorating Robust Hybrid Interphases on 3D Layered Frameworks

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 artificial interphase on a 3D layered graphene/lithium metal framework, in which the interphase is constructed by in-situ reaction between its surface lithium and titanium fluoride contained electrolytes. The as-obtained interphase can maintain its structure integrality and avoid continuous consumption of the fresh Li and electrolytes after undergoing cyclic activation. As a consequence, the Li symmetric cells achieve high-efficiency Li deposition and stable cycling over 3600 h. When paired with LiFePO 4  cathodes, the coin cells exhibit long lifespan (>400 cycles) with almost 90.9% retention of the initial capacity.

Keywords: Lithium metal battery, TiF4 additive, Artificial SEI, 3D framework