Dual‐Salt Electrolyte Additive Enables High Moisture Tolerance and Favorable Electric Double Layer for Lithium Metal Battery

Abstract The carbonate electrolyte chemistry is a primary determinant for the development of high‐voltage lithium metal batteries (LMBs). Unfortunately, their implementation is greatly plagued by sluggish electrode interfacial dynamics and insufficient electrolyte thermodynamic stability. Herein, lithium trifluoroacetate‐lithium nitrate (LiTFA−LiNO 3 ) dual‐salt additive‐reinforced carbonate electrolyte (LTFAN) is proposed for stabilizing high‐voltage LMBs. We reveal that 1) the in situ generated inorganic‐rich electrode‐electrolyte interphase (EEI) enables rapid interfacial dynamics, 2) TFA − preferentially interacts with moisture over PF 6 − to strengthen the moisture tolerance of designed electrolyte, and…

• NN
  National Natural Science Foundation of China

  Award: 22379166
• NS
  Natural Science Foundation for Distinguished Young Scholars of Hunan Province

  Award: 2022JJ10089