[Analysis Case] Local Area Evaluation of Positive Electrode Active Material in Secondary Batteries (C0614)

Composition, crystal structure, and chemical state evaluation near the surface of living materials are possible!

Our company conducts local area evaluation of positive electrode active materials for secondary batteries (C0614). It is known that in lithium-ion secondary batteries, the crystal structure of the active material surface and the valence of metal elements change due to ion extraction and insertion during charge and discharge, as well as degradation. In a case where TEM was used for local area evaluation to assess composition, crystal structure, and chemical state, it was found through EDX that AlOx is coated on the outermost layer. Additionally, electron diffraction and EELS revealed that the crystal structure and valence differ between the surface and the interior of the active material. [Measurement and Processing Methods] ■ [(S)TEM] Scanning Transmission Electron Microscopy ■ [TEM-EDX] Energy Dispersive X-ray Spectroscopy (TEM) ■ [TEM-EELS] Electron Energy Loss Spectroscopy *For more details, please download the PDF or feel free to contact us.

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