New method for calculating charge density in electrochemical systems

Abstract

A new model for calculating the influence of charge density on electrolyte mass transport has been developed. This model is derived from Poisson's equation for charge density and is implemented as an algebraic charge density correction. Use of this method greatly improves the computational efficiency of electrolyte mass transport modelling by avoiding the solution of Poisson's equation. The new correction was used in the simulation of a moving boundary experiment. The predicted moving boundary velocity matched experimental results. Furthermore, the performance of this model was compared with the operator splitting algorithm of Evitts and Watson. Use of the new charge density model resulted in improved computational efficiency, numerical stability and accuracy.