Interface at the Negative Electrode: The Solid Electrolyte Interface-SEI

During Li-ion battery charge reaction, graphite anode is reduced by electrons while Li ions intercalate between its layers. The electrons reduce the components of electrolyte forming a solid electrolyte interface (SEI): a layer composed by reduction product as buffer between graphite electrode and liquid electrolyte. The chapter describes the side products of decomposition deposit over graphite anode during cycling.