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A concentrated dual-salts LiFSI-LiNO 3 /DOL electrolyte was prepared by using LiNO 3 as the inhibitor. The LiF-Li 2 O-oligomers composite SEI layers can efficiently accommodate the rapid plating/stripping of Li metal. A high average Coulombic efficiency of 99.14% was achieved under a large current density of 8.0 mA cm−2. [Display omitted] Developing a high-rate Li metal anode with superior reversibility is a prerequisite for fast-charging Li metal batteries. However, the build-up of large concentration gradients under high current density leads to inhomogeneous Li deposition and unstable passivation layers of Li metal, resulting in lower Coulombic efficiency. Here we report a concentrated dual-salts LiFSI-LiNO 3 /DOL electrolyte to improve the high-rate performance of Li metal anode. Sufficient Li salts help passivate the fresh Li deposition quickly. Further, DOL contributes to the formation of flexible organic layers that can accommodate the rapid volume change of Li metal upon cycling. Li metal in the electrolyte remains stable over 240 cycles with the average Coulombic efficiency of 99.14% under a high current density of 8.0 mA cm−2. [ABSTRACT FROM AUTHOR]

Li-O 2 battery is the leading next-generation battery system, which is known for its extremely high theoretic specific energy. However, the Li metal used in Li-O 2 batteries suffers from low Li utilization and safety hazards. In this work, as an alternative to Li anode, Li 21 Si 5 powders, which are synthesized by an easy mechanical process, are incorporated into a Li-ion oxygen battery. The electrochemical property of the prepared battery and its cycling stability are investigated. Without electrochemical prelithiation, the pursuit of Li-Si alloy anodes in this study provides an easy and scalable strategy for preparing Li-ion oxygen batteries. [ABSTRACT FROM AUTHOR]