Apparent Increasing Lithium Diffusion Coefficient with Applied Current in Graphite. Issue 12 (28th August 2020)

• Record Type: Journal Article
• Authors: Dees, Dennis W.; Rodrigues, Marco-Tulio F.; Kalaga, Kaushik; Trask, Stephen E.; Shkrob, Ilya A.; Abraham, Daniel P.; Jansen, Andrew N.
• Is Part Of: Journal of the Electrochemical Society. Volume 167:Issue 12(2020)
• Publication Date: 2020-08-28
• Subjects: lithium-ion battery -- graphite electrode active material -- lithium diffusion rate; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/abaf9f
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : 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.