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Preparation and electrochemical performance of Li-rich layered cathode material, Li[Ni0.2Li0.2Mn0.6]O2, for lithium-ion batteries

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Abstract

The Li-rich layered cathode material, Li[Ni0.2Li0.2Mn0.6]O2, was synthesized via a “mixed oxalate” method, and its structural and electrochemical properties were compared with the same material synthesized by the sol–gel method. X-ray diffraction (XRD) shows that the synthesized powders have a layered O3–LiCoO2-type structure with the R-3m symmetry. X-ray photoelectron spectroscopy (XPS) indicates that in the above material, Ni and Mn exist in the oxidation states of +2 and +4, respectively. The layered material exhibits an excellent electrochemical performance. Its discharge capacity increases gradually from the initial value of 228 mA hg−1 to a stable capacity of over 260 mA hg−1 after the 10th cycle. It delivers a larger capacity of 258 mA hg−1 at the 30th cycle. The dQ/dV curves suggest that the increasing capacity results from the redox-reaction of Mn4+/Mn3+.

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Acknowledgments

We acknowledge the financial supports from the National Basic Research Program (2009CB220100) and BIT Basic Research Fund (No. 20070542004). We also would like to thank Dr. Guangyao Liu of Institute of Physics, Chinese Academy of Sciences, for his contribution to the Rietveld refinement of the XRD pattern.

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Authors and Affiliations

  1. School of Chemical Engineering and Environment, Beijing Institute of Technology, 100081, Beijing, China

    Feng Wu, Huaquan Lu, Yuefeng Su, Ning Li, Liying Bao & Shi Chen

  2. National Development Center of High Technology Green Materials, 100081, Beijing, China

    Feng Wu, Huaquan Lu, Yuefeng Su, Ning Li, Liying Bao & Shi Chen

Authors
  1. Feng Wu
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  2. Huaquan Lu
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  3. Yuefeng Su
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  4. Ning Li
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  5. Liying Bao
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  6. Shi Chen
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Correspondence to Yuefeng Su.

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Wu, F., Lu, H., Su, Y. et al. Preparation and electrochemical performance of Li-rich layered cathode material, Li[Ni0.2Li0.2Mn0.6]O2, for lithium-ion batteries. J Appl Electrochem 40, 783–789 (2010). https://doi.org/10.1007/s10800-009-0057-2

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