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LaF3 surface-modified LiCr0.05Mn1.95O4 cathode material with improved high-temperature performances for lithium-ion batteries

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Abstract

The LaF3 surface-modified LiCr0.05Mn1.95O4 samples were synthesized by co-precipitation method and characterized by high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and energy-dispersive X-ray detector (EDX). HAADF-STEM and EDX observations showed that LaF3 deposited on the surface of LiCr0.05Mn1.95O4 particles. When tested as the cathode materials for lithium-ion battery, the LaF3-modified LiCr0.05Mn1.95O4 exhibited significantly improved cyclic and rate performances at high temperature (55 °C). Electrochemical impedance spectrum analyses demonstrated that the surface of LiCr0.05Mn1.95O4 modified by LaF3 was much more stable during the electrochemical process and could greatly facilitate the charge–transfer reaction, which may be attributed to the protection of active material by LaF3 from the HF attack.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China

    Huaibing Sun, Ding Zhu, Yungui Chen, Chenghao Xu, Lihong Huang & Hong Yang

Authors
  1. Huaibing Sun
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  2. Ding Zhu
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  3. Yungui Chen
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  4. Chenghao Xu
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  5. Lihong Huang
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  6. Hong Yang
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Corresponding author

Correspondence to Yungui Chen.

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Sun, H., Zhu, D., Chen, Y. et al. LaF3 surface-modified LiCr0.05Mn1.95O4 cathode material with improved high-temperature performances for lithium-ion batteries. J Solid State Electrochem 16, 2979–2982 (2012). https://doi.org/10.1007/s10008-012-1728-1

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  • DOI: https://doi.org/10.1007/s10008-012-1728-1

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