A LiPF6-LiFSI Blended-Salt Electrolyte System for Improved Electrochemical Performance of Anode-Free Batteries

ANODE-free Li-metal batteries (AFLMBs) operating with Li of cathode material have attracted enormous attention due to their exceptional energy density originating from anode-free structure in the confined cell volume. However, uncontrolled dendritic growth lithium on a copper current collector can limit its practical application as it causes fatal issues for stable cycling such dead formation, unstable solid electrolyte interphase, exhaustion, and internal short-circuit. To overcome this limitation, here, we report novel dual-salt comprising 0.2 M LiPF6 + 3.8 bis(fluorosulfonyl) imide carbonate/ester co-solvent 5 wt% fluoroethylene carbonate, 2 vinylene LiNO3 additives. Because facilitates uniform/dense deposition form robust/ionic conductive LiF-based SEI layer deposited Li, Li/Li symmetrical exhibits improved performance low polarization over 200 h operation. Furthermore, LiFePO4/Cu cells carbonate shows significantly enhanced stability compared counterparts consisting different salt ratios. This study an importance design guiding uniform forming AFLMBs.