Open Conference Systems, International Conference on Electrochemical Energy and Technology

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Modeling the SEI formation on graphite electrodes in LiFePO4 batteries
Dongjiang Li, Dmitry Danilov, Yong Yang, Peter Notten

Last modified: 2014-10-15

Abstract


An advanced model is proposed, describing the capacity losses of C6/LiFePO4 batteries under storage and cycling conditions. These capacity losses are attributed to the growth of a Solid Electrolyte Interface (SEI) at the surface of graphite particles in the negative electrode. The model assumes the existence of an inner and outer SEI layer. The rate determining step is considered to be electron tunneling through the inner SEI layer. The inner SEI layer grows much slower than the outer SEI layer. Another contribution to the degradation process is the exfoliation of SEI near the edges of graphite particles during discharging and the formation of new SEI induced by the volumetric changes during the subsequent charging. The model has been validated by storage and cycling experiments. The simulation results show that the capacity losses are dependent on the State-of-Charge (SoC), the storage time and cycle number. The simulations are in good agreement with experimental results.

Keywords


Li-ion battery modeling, Solid Electrolyte Interface, Electron tunneling, Capacity loss

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