Abstract
AbstractThe solid‐electrolyte interface (SEI) layer determines the fast charging capability and cycle life of a lithium‐ion battery. In‐depth investigation of the mosaic SEI layer‘s formation, growth, and stability are of utmost importance to obtain a stable electrochemical performance over cycles. We investigate the stability of the mosaic SEI layer during cycling at a high C‐rate (0.5 C). The composition of the SEI layer is governed by the current density‐dependent formation of inorganic and organic compounds. The inorganic compounds rich outer SEI layer and organic compounds rich inner SEI layer formed after the first lithiation helps in preventing SEI breakdown and growth during cycling. The SEI layer densifies during cycling as a result of the decomposition of the entrapped electrolyte. The composition‐dependent stability of the mosaic SEI layer stability opens up new possibilities for extending the cycle life of lithium‐ion batteries.
Published Version
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