2025/01/18 by Tobias Hölderle, Dominik Petz, Vladislav Kochetov +7 · 1 voice · 1 citation
Engineering · #Advanced Battery Materials and Technologies #Advanced Battery Technologies Research #Advancements in Battery Materials
paper · doi:10.1016/j.ensm.2025.104042
openalex publication_date 2025/01/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/15
• Charging of silicon containing anode delays graphite lithiation. • The amount of silicon content quantified by differential capacity/voltage plots. • X-Ray (Diffraction) CT reveal electrode degradation and lithium homogeneities over multiple scales. This study investigates the impact of silicon content in the graphite anode of cylinder-type Li-ion batteries using operando neutron powder diffraction techniques. A batch of four different Li-ion cells is analyzed, with a focus on the structural response of active cell components during electrochemical cycling. The results indicate that high silicon content in the graphite anode causes a delay in the initial lithiation of graphite, shifting it towards higher voltages independent of the cell's internal resistance. Differential voltage, incremental capacity analyses and quantitative energy-dispersive X-ray spectroscopy, corroborate these structural changes. Additionally, X-ray diffraction computed tomography using a µm-sized synchrotron beam revealed local structural degradation and lithiation inhomogeneity in the high silicon content cells during cycling.