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Core-Shell Model for Cathode Degredation, Part 1 - A. Ghosh

A continuum-scale shrinking core degradation model for Ni-rich positive electrode materials (NMC811) that undergo a structural reorganisation involving oxygen loss and the formation of a disordered (spinel or rock-salt structure) passivation layer (PL) is presented for the first time. The model considers [O] released from the bulk-PL interface and reaction kinetics of the same control reaction rate. Li-entrapment and growing of the PL engender capacity fade. Two limiting cases – ‘diffusion dominated’ and ‘reaction dominated’, manifest with the variation in the relative rates of [O]-diffusion and [O]-release and the thickness of the PL. To submit your questions for our Q&A please tweet us at @batterymodel, email us at [email protected], contact us on Slack (link provided in presentation e-mail) or simply leave a comment in the field below.