Mechanism of Doping with High‐Valence Elements for Developing Ni‐Rich Cathode Materials

Abstract Introducing additional elements into Ni‐rich cathodes is an essential strategy for addressing the instability of the cathode material. Conventionally, this doping strategy considers only the incorporation of additional elements into the bulk structure of the cathode in terms of fortifying the crystal structure. However, high‐valence elements such as Nb 5+ , Ta 5+ , and Mo 6+ are likely to be insoluble in the crystal structure, resulting in accumulation along the interparticle boundaries. Herein, a new mechanism for doping high‐valence elements into Ni‐rich cathodes and their effects on the morphology and crystal structure are investigated by calcining LiNiO 2 (LNO) and X‐doped LNO cathodes (X = Al,…