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Cathode Solid Electrolyte Interphase Generation in Lithium-Ion Batteries with Electrolyte Additives

The development of the next generation of lithium ion batteries for EV, HEV or PHEV requires the development of improved electrolytes. It is well known that the reduction potential of the anode in lithium ion batteries is high enough to reduce common electrolytes in lithium ion batteries. During the first few charge cycles, a solid electrolyte interface (SEI) is generated on the surface of the anode which protects the electrolyte from further reduction. The structure and stability of the anode SEI are very important to the performance of the batteries. Modification of the anode SEI has been conducted by the incorporation of film forming additives, including vinylene carbonate (VC), in lithium-ion battery electrolytes. The additives are preferentially reduced on the surface of the anode to form more stable anode SEIs.