The Interaction in Electrolyte Additives Accelerates Ion Transport to Achieve High‐Energy Non‐Aqueous Lithium Metal Batteries

Abstract Electrolyte engineering is a feasible strategy to realize high energy density lithium metal batteries. However, stabilizing both lithium metal anodes and nickel‐rich layered cathodes is extremely challenging. To break through this bottleneck, a dual‐additives electrolyte containing fluoroethylene carbonate (10 vol.%) and 1‐methoxy‐2‐propylamine (1 vol.%) in conventional LiPF6‐containing carbonate‐based electrolyte is reported. The two additives can polymerize and thus generate dense and uniform LiF and Li3N‐containing interphases on both electrodes’ surfaces. Such robust ionic conductive interphases not only prevent lithium dendrite formation in lithium metal anode but also suppress stress‐corrosion cracking and phase transformation in nickel‐rich layered cathode. The advanced electrolyte enables Li||LiNi0.8Co0.1Mn0.1O2 stably cycle for 80 cycles at 60 mA g−1 with a specific discharge capacity retention of 91.2% under harsh conditions.