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LiMO2@Li2MnO3 positive-electrode material for high energy density lithium ion batteries

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Abstract

Li[Ni1/3Co1/3Mn1/3]O2 (NCM 111) is a promising alternative to LiCoO2, as it is less expensive, more structurally stable, and has better safety characteristics. However, its capacity of 155 mAh g−1 is quite low, and cycling at potentials above 4.5 V leads to rapid capacity deterioration. Here, we report a successful synthesis of lithium-rich layered oxides (LLOs) with a core of LiMO2 (R-3m, M = Ni, Co) and a shell of Li2MnO3 (C2/m) (the molar ratio of Ni, Co to Mn is the same as that in NCM 111). The core–shell structure of these LLOs was confirmed by XRD, TEM, and XPS. The Rietveld refinement data showed that these LLOs possess less Li+/Ni2+ cation disorder and stronger M*–O (M* = Mn, Co, Ni) bonds than NCM 111. The core–shell material Li1.15Na0.5(Ni1/3Co1/3)core(Mn1/3)shellO2 can be cycled to a high upper cutoff potential of 4.7 V, delivers a high discharge capacity of 218 mAh g−1 at 20 mA g−1, and retains 90 % of its discharge capacity at 100 mA g−1 after 90 cycles; thus, the use of this material in lithium ion batteries could substantially increase their energy density.

Average voltage vs. number of cycles for the core–shell and pristine materials at 20 mA g−1 for 10 cycles followed by 90 cycles at 100 mA g−1

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China

    Mohammed Adnan Mezaal, Limin Qu, Guanghua Li, Wei Liu, Xiaoyuan Zhao, Ke Zhang, Rui Zhang & Lixu Lei

  2. Department of Chemistry, College of Science, University of Karbala, Karbala, 56001, Iraq

    Mohammed Adnan Mezaal

  3. Shenzhen Optimumnano Energy Co., Ltd., Shenzhen, 518118, China

    Guanghua Li

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  1. Mohammed Adnan Mezaal
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  2. Limin Qu
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  3. Guanghua Li
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  4. Wei Liu
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  5. Xiaoyuan Zhao
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  6. Ke Zhang
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  8. Lixu Lei
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Correspondence to Lixu Lei.

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Mezaal, M.A., Qu, L., Li, G. et al. LiMO2@Li2MnO3 positive-electrode material for high energy density lithium ion batteries. J Solid State Electrochem 21, 145–152 (2017). https://doi.org/10.1007/s10008-016-3345-x

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  • DOI: https://doi.org/10.1007/s10008-016-3345-x

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