Presentation Title：Research and Application Progress of Nb inNCM (Ni≥90%）ternary oxide cathode materials

Abstract: 

Driven by the strong demand for high-energy-density lithium-ion batteries, Ni-rich ternary cathode materials (NCM, nickel content ≥ 90%) have become one of the key materials in the field of power batteries. However, while the Ni-rich content enhances capacity, it also leads to insufficient crystal structural stability, manifested as a tendency for harmful phase transitions during cycling and intensified side reactions with the electrolyte. Additionally, the decline in mechanical integrity can induce microcrack formation, accompanied by phenomena such as cation mixing and oxygen release, which severely limit cycle life and safety. Niobium modification technology is widely regarded as an effective approach to enhance the structural stability and cycling performance of Ni-rich NCM. This report focuses on the optimization of niobium-modified NCM in liquid electrolyte systems through a dual-parameter strategy involving primary particle morphology and cation intermixing degree. Combined with thermodynamic and electrochemical methods, the main inducing factors of cracking behavior in Ni-rich NCM are thoroughly investigated. Furthermore, in solid-state battery systems, the response mechanism of niobium-modified Ni-rich NCM to cell assembly pressure and its impact on electrochemical performance are also discussed.

Bio:

Prof. Xuejie Huang is currently a professor at the Institute of Physics, Chinese Academy of Sciences (CAS). He is also the Deputy Director of the Songshan Lake Materials Laboratory, and Chairman of the Editorial Board forEnergy Storage Science and Technology (CNKI,Scopus). Additionally, he serves as an expert in the overall group of the National Key R&D Program of New Energy Vehicles and thevice president of the China Battery Industrial Association.His primary focus lies in the research of secondary lithium batteries and their related materials, process technologies, and equipments. He has published over 400 academic papers in international scientific journals and holds more than 130 patents.