Highly Fluorinated Interphases Enable High-Voltage Li-Metal Batteries

We were able to demonstrate excellent cycling performance of Li-metal anodes in carbonate electrolytes by increasing the Li bis(fluorosulfonyl)imide (LiFSI) concentration to ∼10 M. The high concentration (10 M) of FSI anion enabled interphases of high F content on both Li-metal anode and Ni-rich NMC (nickel-manganese-cobalt) cathode surfaces. Such F-rich interphases effectively suppressed Li dendrite formation, as demonstrated by a high Li...