Realizing a high voltage lithium metal battery in ether-based electrolyte by regulating the cathode electrolyte interphase

Abstract

A combination of lithium bis(fluorosulfonyl)imide (LiFSI) and LiNO₃ is designed to improve the oxidation resistance of cyclic ether (tetrahydrofuran) electrolyte at conventional concentration (1M LiFSI). The addition of NO₃⁻ results in the formation of a uniform N- and F-rich cathode electrolyte interphase, which enables 90% capacity retention of Li||LiNi_0.80Co_0.10Mn_0.10O₂ batteries over 80 cycles coupled with a thin lithium metal anode (50 μm) and a high-capacity cathode (∼3 mA h cm⁻²).