At the same time, a side reaction occurs between the lithium salt and the electrolyte, and a solid electrolyte interface (SEI) film is formed on the negative electrode side of the lithium battery. This layer of film can prevent further side reactions from occurring, thereby reducing the loss of active lithium in the lithium battery.
The quality of SEI has a great influence on the cycle life, initial capacity loss, and rate performance of lithium batteries.
