Designing High Donor Number Anion Additive for Stable Lithium Metal Batteries

The electrolytes in energy-dense lithium metal batteries (LMBs) face the challenge of being compatible with both the lithium anode and the high voltage cathodes. Adjusting the solvation structures of the electrolytes by regulating the interaction between ions and solvents is an effective strategy to improve the stability of LMBs. Herein, lithium trifluoroacetate (LiTFA) endowed with high donor number is introduced into ether-based electrolytes as an additive to regulate the solvation structure and further stabilize the interphase as well as accelerate the interfacial kinetic of LMBs. Due to the strong interaction between TFA