Evaluation of Electrochemical Interface Area and Lithium Diffusion Coefficient for a Composite Graphite Anode

A structural model to calculate the electrochemical interface area for a composite graphite electrode is described. A new equation using the model predicted area to calculated chemical diffusion coefficient eliminates the effects from fabrication such as active mass and geometric area The chemical diffusion coefficient values calculated for graphite electrodes of different thicknesses and porosities using the new equation are almost the same as expected. The values of in the graphite vary between and over the course of the lithium deintercalation in the graphite samples. © 2004 The Electrochemical Society. All rights reserved.