A theoretical approach for estimating a best constant diffusion coefficient to use in an electrode model is presented for the case where experimental data exist on the diffusion coefficient as a function of the state of charge of an intercalation material. This method uses a model of diffusion in a single particle as its basis. From examining the surface concentration vs. average concentration curve for diffusion in a single particle, we can determine a diffusion coefficient that is a function of the dimensionless flux rate of material into the particle. This diffusion coefficient function can then be used in a model of a porous electrode.
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Paxton et al. (1996) studied this question.