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Solid electrolyte interphase (SEI) is known as an electronic insulating but ionic conducting film formed on the surface of the electrodes in Li-ion batteries (LIB).It is widely accepted that the physical and chemical properties of the SEI film have significant impacts on the electrochemical performances of LIBs.In the past, most of the researchers were focusing on the SEI films formed on anode, because the electrolyte will decompose at the working potential of the anode (<1.2 V versus Li+/Li) while it is stable under the typical working potential of the cathode (<4.2 V versus Li+/Li).