Ionic Liquid Electrolyte with Weak Solvating Molecule Regulation for Stable Li Deposition in High-Performance Li-O 2 Batteries.

Li-O 2 batteries with bis(trifluoromethanesulfonyl)imide-based ionic liquid (TFSI-IL) electrolyte are promising because TFSI-IL can stabilize O 2 - to lower charge overpotential. However, slow Li + transport in TFSI-IL electrolyte causes inferior Li deposition. Here we optimize weak solvating molecule (anisole) to generate anisole-doped ionic aggregate in TFSI-IL electrolyte. Such unique solvation environment can realize not only high Li + transport parameters but also anion-derived solid electrolyte interface (SEI). Thus, fast Li + transport is achieved in electrolyte bulk and SEI simultaneously, leading to robust Li deposition with high rate capability (3 mA cm -2 ) and long cycle life (2000 h at 0.2 mA cm -2 ). Moreover, Li-O 2 batteries show good cycling stability (a small overpotential increase of 0.16 V after 120 cycles) and high rate capability (1 A g -1 ). This work provides an effective electrolyte design principle to realize stable Li deposition and high-performance Li-O 2 batteries.