biostudies-literatureUnknown15(56)Lee MHWith the growing demand for high energy density and fast-charging/high-rate performance, understanding the thermodynamic and kinetic behavior of graphite/silicon composite anodes has become increasingly important. In this study, graphite/Si alloy composite electrodes containing 0-50 wt% silicon alloy were investigated using a three-electrode pouch cell combined with <i>in situ</i> dilation. Through this analysis, the changes in porosity after the formation cycles were determined, while the lithium-ion diffusion coefficient (<i>D</i> _Li⁺ ) was calculated based on the Weppner-Huggins equation. In addition, the resistance components were quantitatively evaluated by pulse polarization and electrochemical impedance spectroscopy (EIS). This study elucidates the effect of poRSC advances47790-47802https://www.ebi.ac.uk/biostudies/studies/S-EPMC12679607biostudies-literatureThe impact of volume expansion on thermodynamic and kinetic properties of graphite/Si alloy composite anodes.PMC12679607Mukhan OLee MHKim SSBakenov ZTatykayev BMpupuni CTfalseThe impact of volume expansion on thermodynamic and kinetic properties of graphite/Si alloy composite anodes.With the growing demand for high energy density and fast-charging/high-rate performance, understanding the thermodynamic and kinetic behavior of graphite/silicon composite anodes has become increasingly important. In this study, graphite/Si alloy composite electrodes containing 0-50 wt% silicon alloy were investigated using a three-electrode pouch cell combined with <i>in situ</i> dilation. Through this analysis, the changes in porosity after the formation cycles were determined, while the lithium-ion diffusion coefficient (<i>D</i> _Li⁺ ) was calculated based on the Weppner-Huggins equation. In addition, the resistance components were quantitatively evaluated by pulse polarization and electrochemical impedance spectroscopy (EIS). This study elucidates the effect of po2025-01-01T00:00:00Z2025 Dec2026-06-05T23:24:42.76Z2026-05-23T03:13:08.448ZS-EPMC126796074135710610.1039/d5ra07317k