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Lithium-rich layered nickel–manganese oxides as high-performance cathode materials: the effects of composition and PEG on performance

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Abstract

Lithium-rich layered nickel–manganese oxide (LRL-NMO) as a cathode material for rechargeable lithium-ion batteries was successfully prepared using an oxalic acid co-precipitation method, with polyethylene glycol (PEG1000) as an additive. The effects of the Ni/Mn ratio and of PEG on the phase purity, morphology, and electrochemical performance of LRL-NMO were investigated with X-ray diffraction, scanning electron microscope, electrochemical impedance spectroscopy, and charge/discharge testing. Li[Li0.167Ni0.25Mn0.580]O2 delivered the best electrochemical performance among the various Li[Li1/3−2x/3Ni x Mn2/3−x/3]O2 (0 < x < 0.5) materials. Furthermore, the sample to which an appropriate amount of PEG had been added showed much smaller and more uniform particle size, higher discharge capacity and energy density, better cycling stability, and lower resistance. The material prepared by adding 9 wt% PEG exhibited high discharge capacity and stability; after 100 cycles at 2 C, it still delivered a discharge capacity of 125.6 mAh g−1, which was 50 % higher than that of a sample prepared without PEG.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (NSFC project nos. 21276098, 21476088, 51302091, and U1301245), the Natural Science Foundation of Guangdong Province (project nos. 2014A010105041 and 2015A030312007), and the Educational Commission of Guangdong Province (project no. 2013CXZDA003).

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Authors and Affiliations

  1. The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China

    Meifeng Chen, Wan Ren, Yijia Shao, Ting Shu, Lina Liu & Shijun Liao

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  1. Meifeng Chen
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  2. Wan Ren
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  3. Yijia Shao
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  4. Ting Shu
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  5. Lina Liu
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  6. Shijun Liao
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Correspondence to Shijun Liao.

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Chen, M., Ren, W., Shao, Y. et al. Lithium-rich layered nickel–manganese oxides as high-performance cathode materials: the effects of composition and PEG on performance. Ionics 22, 2067–2073 (2016). https://doi.org/10.1007/s11581-016-1747-5

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  • DOI: https://doi.org/10.1007/s11581-016-1747-5

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