Towards Ni-rich layered oxides cathodes with low Li/Ni intermixing by mild molten-salt ion exchange for lithium-ion batteries. (November 2022)

• Record Type: Journal Article
• Authors: Luo, Yu-hong; Pan, Qing-lin; Wei, Han-xin; Huang, Ying-de; Tang, Lin-bo; Wang, Zhen-yu; He, Zhen-jiang; Yan, Cheng; Mao, Jing; Dai, Ke-hua; Zhang, Xia-hui; Zheng, Jun-chao
• Is Part Of: Nano energy. Volume 102(2022)
• Publication Date: 2022-11
• Subjects: Layered transition metal oxides -- Ion exchange -- Heat treatment -- Low-temperature synthesis -- Processing-structure-performance relationships; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.107626
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: In the conventional synthesis of layered transition metal oxides, the high-temperature process not only causes lithium loss due to evaporation, but also facilitate the inevitable cation mixing of Li + and Ni 2+, resulting in severe shifts in their stoichiometric ratios and thus structure instability. Herein, we report a universal ion-exchange method to prepare Ni-rich layered oxide materials LiNi0.85 Co0.06 Mn0.09 O2 (NCM85) with low Li/Ni intermixing at a low reaction temperature of 300 °C, where sodium-based layered oxides (NaNi0.85 Co0.06 Mn0.09 O2 ) were used as precursors for ion exchange with Li + ion in lithium molten salts. By studying the effects of ion-exchange time and additional heat treatment on the structure and performance of the layered oxide materials, we established the processing-structure-performance relationships for Ni-rich NCM85 materials. Moreover, we further demonstrated the universality of this ion-exchange method and processing-structure-performance relationships for other layered oxide materials including LiNi0. 5 Co0.2 Mn0.3 O2 and LiNi0.5 Mn0.5 O2 . We anticipate that such universal method of ion exchange and universal processing-structure-performance relationships can guide the rational design and synthesis of other layered oxide materials for lithium-ion batteries. Graphical Abstract: The Ni-rich layered oxides cathodes with low Li/Ni intermixing obtained by ion exchange at a low reaction temperature, where sodium-based layered oxides were used as precursors for ion exchange with Li + ion in lithium molten salts. ga1 Highlights: The materials prepared by ion exchange solve theproblems of Li/Ni mixing and high temperature sensitivity. The relationship between processing-structure-performance is constructed by studying the ion exchanged materials. The universality of ion exchange and processing-structure-performance relationships for other materialsis demonstrated.