Galvanostatic Fast Charging of Alkali‐Ion Battery Materials at the Single‐Particle Level: A Map‐Driven Diagnosis

• Published in: Chemphyschem Vol. 24; no. 6; pp. e202200665 - n/a
• Main Authors: Gavilán‐Arriazu, E. Maximiliano, Barraco, Daniel E., Ein‐Eli, Yair, Leiva, Ezequiel P. M.
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 14-03-2023
• Subjects: alkali-ion batteries; Dimensionless numbers; fast-charging; galvanostatic simulations; ion intercalations; Mathematical models; Parameters; single-particle; alkali-ion batteries; fast-charging; galvanostatic simulations; single-particle; ion intercalations
• ISSN: 1439-4235; 1439-7641
• DOI: 10.1002/cphc.202200665

In this work, we develop a new tool to provide a diagnostic map for alkali‐ion intercalation materials under galvanostatic conditions. These representations, stated in the form of capacity level diagrams, are built from hundreds of numerical simulations representing different experimental conditions, summarized in two dimensionless parameters: a kinetic parameter denominated Ξ and a finite diffusion parameter l. To lay the theoretical and methodological foundations, a general model is used here. This model can be adapted to the thermodynamic and kinetic framework of specific systems. We provide two representative examples.
A model to rapidly estimate the specific capacity of single particles of alkali‐ion materials under galvanostatic charging/discharging conditions is presented for different C‐rates and particle sizes. The capacity is assessed in terms of two scaled parameters of the material, representing kinetic and diffusional restrictions.