Small, Год журнала: 2025, Номер unknown

Опубликована: Апрель 26, 2025

Abstract Electrochemical energy storage through conversion reactions in crystalline electrode materials primarily depends on the size of guest ions. In this study, a combination synchrotron−based transmission X−ray microscopy and absorption near edge spectroscopy is utilized to reveal dynamic physicochemical changes micro−regions spherical NiS 2 active particles during potassiation/depotassiation process. The findings show that, as degree potassiation increases, visible cracks voids form within bulk material, with significant differences chemical valence states metal elements between inner outer regions. Furthermore, induce formation new cracks, which propagate extensively into bulk, serving root cause particle failure. Based these observations, it also demonstrated that failure phenomenon can be mitigated dimensional engineering strategies, paving way for development high−capacity highly stable potassium−ion batteries.

Язык: Английский