Capacity Fade Analysis of Silicon Anodes with a Polydopamine-Treated Copper Foil: A Multiphysics-Based Model Approach

Abstract

Treating the surface of current collectors with polydopamine has proven to be a means of resolving the issues related to delamination of silicon composite electrodes (1, 2). This is manifested in the improvement in the electrochemical performance owing to the enhanced adhesion between the silicon composite electrode and current collectors. However, the mechanisms underlying this enhancement is not well understood. In this study, a porous composite-electrode physics-based model is used to analyze the cycle performance of silicon-based anode half-cells with bare and PD-treated copper current collectors via a parameter estimation technique. Based on the estimation of the parameters that change with cycling, the various mechanisms associated with the capacity fade in the bare and PD-treated copper current collector are investigated. A quantitative analysis of the aging mechanism of silicon-based anodes in terms of Li ions loss is performed and discussed for the two cell configurations. The percentage contribution of the various identified mechanisms are estimated for the cells with the bare and PD-treated copper current collector. D. Song, D. Jung, I. Cho, M. H. Ryou and Y. M. Lee, Advanced Materials Interfaces, 3, 1600270 (2016).W. A. Appiah, J. Park, S. Byun, I. Cho, A. Mozer, M.-H. Ryou and Y. M. Lee, Journal of Power Sources (2018). Figure 1. Schematic diagram of electrode design and cycle performance of cells with bare and PD-treated copper current collector. Figure 1