Comprehensive understanding of Li/Ni intermixing in layered transition metal oxides. (December 2021)

• Record Type: Journal Article
• Authors: Wei, Han-xin; Tang, Lin-bo; Huang, Ying-de; Wang, Zhen-yu; Luo, Yu-hong; He, Zhen-jiang; Yan, Cheng; Mao, Jing; Dai, Ke-hua; Zheng, Jun-chao
• Is Part Of: Materials today. Volume 51(2021)
• Page Start: 365
• Page End: 392
• Publication Date: 2021-12
• Subjects: Lithium ion batteries -- Cathode materials -- Li/Ni intermixing -- Ni-rich layered cathodes; Materials science -- Periodicals; Metallurgy -- Periodicals; Metal-work -- Periodicals; Biomedical and Dental Materials -- Periodicals; Manufactured Materials -- Periodicals; Metals -- Periodicals; 620.11
• DOI: 10.1016/j.mattod.2021.09.013
• Languages: English
• ISSNs: 1369-7021

Abstract

Graphical abstract: Abstract: With the development of high energy density battery technology, layered transition metal oxide cathode materials, particularly Ni-rich layered cathodes of Li-ion batteries are urgently required due to its high energy density. However, Li/Ni intermixing inevitably occurs in Ni-rich cathode materials and affects the materials in terms of structure and performance. This review comprehensively summarizes the causes of Li/Ni intermixing and analyzes its inevitability due to ionic radius, Ni migration, magnetic interactions, and thermal stability. In addition, the effect of Li/Ni intermixing on materials is summarized, particularly its benefits, which have not yet been comprehensively examined. Finally, the methods for regulating Li/Ni intermixing that corresponds to its causes are presented in detail. This review can help researchers fully understand Li/Ni intermixing and propose solutions for the current shortcomings of Li/Ni intermixing research and directions for future studies.