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

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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 Li1.2Ni0.15Fe0.1Mn0.55O2. 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 Li1.2Ni0.15Fe0.1Mn0.55O2 cycled at high potential was significantly improved and the voltage fade was largely suppressed.

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Acknowledgement

This work was financially supported by the project of International Science & Technology Cooperation of China (No. 2019YFE0100200).

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Authors and Affiliations

  1. Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China

    Wei Liu, Jinxing Li, Hanying Xu, Jie Li & Xinping Qiu

  2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jinxing Li

Authors
  1. Wei Liu
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  2. Jinxing Li
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  3. Hanying Xu
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  4. Jie Li
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  5. Xinping Qiu
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Correspondence to Xinping Qiu.

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The authors have no competing interests to declare that are relevant to the content of this article.

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Liu, W., Li, J., Xu, H. et al. Stabilized cobalt-free lithium-rich cathode materials with an artificial lithium fluoride coating. Int J Miner Metall Mater 29, 917–924 (2022). https://doi.org/10.1007/s12613-022-2483-7

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  • DOI: https://doi.org/10.1007/s12613-022-2483-7

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