Case study of failure analysis of oxide-based all-solid-state batteries
アイテス
We will introduce a case where a series of analyses from failure location identification to cross-sectional observation was conducted on oxide-based all-solid-state batteries that were destroyed by reliability testing. Thermal analysis revealed a tendency for strong heat generation on the side, and X-ray transmission observation showed a white linear contrast anomaly near the boundary where heat generation was observed in the X-ray transmission image. It is suspected that some abnormality is occurring in the white line area. When cross-sectional SEM observation was performed on the area where the anomaly was visible, layer delamination was observed. It is speculated that the positive (negative) electrode layers expanded and contracted repeatedly due to reliability testing, leading to delamination between the current collector and the electrolyte layer.
