Statistical Kinetics of Phase-Transforming Nanoparticles in LiFePO4 Porous Electrodes

Abstract

Using a simple mathematical model, we demonstrate that statistical kinetics of phase-transforming nanoparticles in porous electrodes results in macroscopic non-monotonic transient currents, which could be misinterpreted as the nucleation and growth mechanism by the Kolmogorov-Johnson-Mehl-Avrami (KJMA) theory. Our model decouples the roles of nucleation and surface reaction in the electrochemically driven phase-transformation process by a special activation rate and the mean particle-filling speed of active nanoparticles, which can be extracted from the responses of porous electrodes to identify the dynamics in single composing nanoparticles.

Accepted by Electrochimica Acta

Cited by in corpus (4)

• Theory of Chemical Kinetics and Charge Transfer based on Nonequilibrium Thermodynamics
• Charge Transfer Kinetics at the Solid-Solid Interface in Porous Electrodes
• Operando Electrochemical Kinetics in Particulate Porous Electrodes by Quantifying the Mesoscale Spatiotemporal Heterogeneities
• Interplay between Phase Transformation Instabilities and Spatiotemporal Reaction Heterogeneities in Particulate Intercalation Electrodes