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Electrochemical modeling shows increasing apparent lithium diffusion at higher currents in graphite electrodes, suggesting lithium transport does not limit electric vehicle fast charging.
In this study, we assert that the apparent lithium diffusion coefficient in graphite active particles in the negative electrodes of lithium-ion cells increases appreciably with the intercalation rate. This assertion is based on an electrochemical model analysis of a wide range of electrochemical micro-reference electrode full cell studies on a coated natural graphite and other literature results. While the mechanism for this increase is a subject of further investigation, the results of our study suggest that the lithium transport in the graphite does not limit the maximum attainable charging rate in typical lithium-ion cells for electric vehicles.
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Dees et al. (2020) studied this question.
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