Improving electrochemical performance of Ni-rich layered oxide cathodes via one-step dual modification strategy

• Published in: Transactions of Nonferrous Metals Society of China 2022-11, Vol.32 (11), p.3663-3678
• Main Authors: CAO, Yuan-lin, YANG, Xiu-kang, WANG, Lu, XIAO, Ling, FU, Ni, ZOU, Li, MA, Wen-bo, LIU, Zhe-ting, WANG, Xiao-qin, LIU, Li, SHU, Hong-bo, WANG, Xian-you
• Format: Article
• Language: English
• Subjects: dual modification; electrochemical performance; Ni-rich cathodes; niobium; one-step strategy; structural stability
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(22)66047-3

A one-step overall strategy from surface to bulk was proposed to simultaneously synthesize the Nb-doped and LiNbO3-coated LiNi0.83Co0.12Mn0.05O2 cathode materials. The incorporation of LiNbO3 coating can regulate the interface and facilitate the diffusion of Li-ions. Simultaneously, the stronger Nb—O bond can effectively suppress Li+/Ni2+ cation mixing and strengthen the stability of crystal structure, which helps to mitigate the anisotropic variations of lattice parameters during Li+ de/intercalation. The results showed that the dual-modified materials exhibited good structural stability and distinguished electrochemical performance. The optimal NCM-Nb2 sample showed an excellent capacity retention of 90.78% after 100 cycles at 1C rate between 2.7 and 4.3 V, while only 67.90% for the pristine one. Meanwhile, it displayed a superior rate capability of 149.1 mA·h/g at the 10C rate. These results highlight the feasibility of one-step dual modification strategy to synchronously improve the electrochemical performance of Ni-rich layered oxide cathodes.