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||LiNi0.80Co0.10Mn0.10O2 batteries over 80 cycles coupled with a thin lithium metal anode (50 μm) and a highcapacity cathode (~3 mA h cm-2).