Capacity Fade Modeling of a Lithium Ion Cell with a Spinel-Based Cathode and an Artificial Graphite Anode

Abstract

To enhance the understanding of capacity fade mechanism in lithium ion batteries consisting of a spinel-based cathode and an artificial graphite, an all-inclusive mathematical model describing the cycling performance of LiMn2O4/graphite lithium ion cell is developed in this work. The proposed model assumes the formation and dissolution of the solid electrolyte interphase (SEI) at the anode, Mn(II) dissolution of LiMn2O4 cathode active material due to Mn(III) disproportionation reaction and its effects on the SEI at the anode as well as the formation of SEI on the cathode. The decrease of Li ion diffusion coefficient in the cathode due to the formation of passive film and active material dissolution is added as a factor that results in capacity fade. Temperature effects on the capacity fade parameters and its kinetic reaction are incorporated in this model via an Arrhenius-type dependence of the rate constants and apparent diffusion coefficient. The developed model is incorporated into the Newman’s Porous Composite Electrode framework (PCE) and implemented in the battery module of COMSOL Multiphysics. The proposed model is used to study the effects of variations in temperature and voltage range of cycling on the capacity fade and changes in volume fraction of cathode active material, resistance in the cell and SEI thickness. References W. A. Appiah, J. Park, L. Van Khue, Y. Lee, J. Choi, M.-H. Ryou and Y. M. Lee, Electrochimica Acta, 187, 422 (2016)S. Ramesh and B. Krishnamurthy, Journal of The Electrochemical Society, 162, A545 (2015)L. Cai, Y. Dai, M. Nicholson, R. E. White, K. Jagannathan and G. Bhatia, Journal of Power Sources, 221, 191 (2013) Acknowledgement This work was supported by the Sebang Global Battery and the Human Resource Training Program for Regional Innovation and Creativity through the Ministry of Education and National Research Foundation of Korea (NRF-2014H1C1A1066977).