SEI formation and growth is one of the foundational degradation mechanism for Li-ion cells. It is a complex process, but there exist some fairly simple models that can be a starting point. See, e.g.
M. Safari, M. Morcrette, A. Teyssot, and C. Delacourt. Multimodal Physics-Based Aging Model for Life Prediction of Li-Ion Batteries. Journal of The Electrochemical Society, 156(3):A145, 2009. doi:10.1149/1.3043429.
SEI formation and growth is one of the foundational degradation mechanism for Li-ion cells. It is a complex process, but there exist some fairly simple models that can be a starting point. See, e.g.
M. Safari, M. Morcrette, A. Teyssot, and C. Delacourt. Multimodal Physics-Based Aging Model for Life Prediction of Li-Ion Batteries. Journal of The Electrochemical Society, 156(3):A145, 2009. doi:10.1149/1.3043429.