Technical Data: Evaluation of Element Distribution and Chemical State of SEI Film on Secondary Battery Anode

Composite approach to the cross-sectional structure and surface shape of the negative electrode, as well as elemental mapping images of the active material cross-section!

One of the causes of capacity degradation at the negative electrode of lithium-ion secondary batteries is the formation of a film called SEI (Solid Electrolyte Interphase), which is created by interfacial reactions between the active material and the electrolyte, resulting in various lithium salt compounds complexing on the surface of the active material. To improve battery performance, control over the composition, thickness, and chemical bonding state of the SEI film is required. This document presents examples of evaluations of the SEI film formed on the surface of carbon-based negative electrode active materials for automotive batteries using SEM, TEM, TEM-EELS, TOF-SIMS, and XPS. *For more details, please refer to the PDF document or feel free to contact us.*

Secondary Cells/BatteriesContract measurement