A solid electrolyte interphase is generated on the anode of lithium ion batteries during the first few charging cycles.  The presence and stability of the SEI is critical to the performance of the battery.  Despite thorough investigation of the SEI for over 20 years, the mechanism of formation and function are still relatively poorly understood.  We have investigated the structure of the SEI on graphite and silicon electrodes along with changes which occur to the SEI upon additional cycling.  In addition, we have been using the one electron reducing agent, lithium napthalenide to independently prepare the reduction products which constitute the SEI.  The reduction products and their subsequent decomposition products have been thoroughly investigated via a combination of NMR, XPS, IR-ATR, TGA, and GC-MS.  The investigation of SEI via different methods of generation and evolution provides significant insight into the structure and properties of the anode SEI.

Generation and evolution of materials in the anode Solid Electrolyte Interphase (SEI) of lithium ion batteries

253rd National Meeting (2017)

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