LAUSR

Due to the strong energy advantage of lithium anodes, the development of lithium-metal batteries has become an inevitable trend. However, plagued by the instability of SEI films, lithium metal anodes face challenges such as lithium dendrites and volume expansion. Studies have proven that modulating the composition and structure of SEI films by using electrolyte additives is a convenient and valid method. Currently, it is widely accepted that fluoride is remarkable as an additive but based on the high cost of fluoride production and the unfriendly environment, the development of fluoride-free additives is of great significance. In this work, a bifunctional additive N, O-bis(trimethylsilyl)acetamide (BSA) was proposed, which can build up a SEI layer rich in SiOx and Li3N on the surface of lithium anode to control the deposition behavior of lithium and clean the electrolyte from HF to protect the electrode. The experimental results presented that BSA suppressed the generation of lithium dendrites and controlled the volume expansion of lithium anodes. Meanwhile, compared with the commonly used carbonate electrolyte, the battery containing BSA has the best overall performance. Methodologically, the results can be extended to other additives containing Si-O functional groups to replace the same type of fluorine-containing additives.