Presentation Title: Niobium-Enabled High Voltage LiNi_0.5Mn_1.5O₄–Titanium Niobium Oxide Electrochemical System: Multielement Cathode Engineering and High-Power Full-Cell Development

Abstract: 

    Spinel LiNi_0.5Mn_1.5O₄（LNMO）is a promising 5 V-class cathode for high-energy lithium-ion batteries because of its high operating voltage, cobalt-free chemistry, and three-dimensional Li-ion diffusion framework. However, its practical application is still limited by severe electrode–electrolyte side reactions at high potentials, transition-metal dissolution, oxygen loss, and structural distortion, especially during long-term and elevated-temperature cycling. This presentation focuses on the construction of an electrochemical system based on a 5 V LNMO cathode and a titanium–niobium oxide anode. On the cathode side, a Nb-containing multielement microdoping strategy is introduced to regulate the local coordination environment through multicomponent synergy, aiming to improve Li-ion transport kinetics and high-voltage structural stability while maintaining the spinel framework. Structural, spectroscopic, operando, and electrochemical kinetic characterizations are combined to elucidate the effects of the Nb-containing multielement regulation on cycling stability, rate capability, and high-temperature performance. On this basis, the modified LNMO cathode is further coupled with a high-power titanium–niobium oxide anode to construct a full-cell system. Capacity matching, operating-voltage window, electrolyte compatibility, and full-cell electrochemical performance are discussed. Finally, perspectives are provided on the role of niobium in stabilizing high-voltage cathodes, enabling fast lithium storage in high-power anodes, and facilitating synergistic cathode–anode electrochemical system design. 

Biography: 

     Ye Yang，Deputy Director of the Special Power Supply Division, Chengdu Science and Technology Center, China Academy of Engineering Physics (CAEP), Research Professor. His research focuses on the development of high‑safety, high‑rate energy‑storage devices. He has completed the development of multiple high‑safety, high‑power, lightweight energy‑storage battery systems. In recent years, he has published more than 30 relevant papers and been granted nearly 10 invention patents.