Stabilized cobalt-free lithium-rich cathode materials with an artificial lithium fluoride coating

Wei Liu; Jinxing Li; Hanying Xu; Jie Li; Xinping Qiu

doi:10.1007/s12613-022-2483-7

Volume 29 Issue 5

Apr. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(5): 917-924

Wei Liu, Jinxing Li, Hanying Xu, Jie Li, and Xinping Qiu, Stabilized cobalt-free lithium-rich cathode materials with an artificial lithium fluoride coating, Int. J. Miner. Metall. Mater., 29(2022), No. 5, pp. 917-924. https://doi.org/10.1007/s12613-022-2483-7

Cite this article as:

Wei Liu, Jinxing Li, Hanying Xu, Jie Li, and Xinping Qiu, Stabilized cobalt-free lithium-rich cathode materials with an artificial lithium fluoride coating, Int. J. Miner. Metall. Mater., 29(2022), No. 5, pp. 917-924. https://doi.org/10.1007/s12613-022-2483-7

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Research Article

Stabilized cobalt-free lithium-rich cathode materials with an artificial lithium fluoride coating

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Corresponding author:
Xinping Qiu E-mail: qiuxp@mail.tsinghua.edu.cn
Received: 19 January 2022; Revised: 24 March 2022; Accepted: 28 March 2022; Available online: 29 March 2022

Abstract

Abstract

Iron-substituted cobalt-free lithium-rich manganese-based materials, with advantages of high specific capacity, high safety, and low cost, have been considered as the potential cathodes for lithium ion batteries. However, challenges, such as poor cycle stability and fast voltage fade during cycling under high potential, hinder these materials from commercialization. Here, we developed a method to directly coat LiF on the particle surface of Li_1.2Ni_0.15Fe_0.1Mn_0.55O₂. A uniform and flat film was successfully formed with a thickness about 3 nm, which can effectively protect the cathode material from irreversible phase transition during the deintercalation of Li⁺. After surface coating with 0.5wt% LiF, the cycling stability of Li_1.2Ni_0.15Fe_0.1Mn_0.55O₂ cycled at high potential was significantly improved and the voltage fade was largely suppressed.
- cobalt-free lithium-rich cathode materials;
- lithium fluoride coating;
- cycle stability;
- dissolution

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