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Effects of polyvinyl alcohol on the electrochemical performance of LiNi0.8Co0.15Al0.05O2 cathode material

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Abstract

In view of the close relationship between the morphology of LiNi0.8Co0.15Al0.05O2 (NCA) and its electrochemical performance, polyvinyl alcohol (PVA) was added to control the NCA morphology. And thus a new NCA cathode material modified by PVA (NCA-PVA) was prepared. The morphology and structure of the obtained samples were characterized by X-ray diffraction, scanning electron microscopy, and laser diffraction. The electrochemical performance was characterized with electrochemical workstation and cell tester by assembling into CR2032 coin-type half-cell. The results show that the obtained NCA-PVA has a better layer structure and smaller cation mixing degree, smaller particle size, and more uniform particle size distribution than the pristine NCA without adding PVA. The electrochemical performance is also improved: the initial discharge capacity increases from 143.36 to 184.84 mAh g−1. And the charge-discharge efficiency increases from 78.25 to 86.42%. The specific discharge capacities of NCA-PVA are all higher than that of the NCA (about 50 mAh g−1) at all testing rates (0.1, 0.2, 0.5, 1.0, 2.0, and 5.0 C).

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Funding

The work was supported by the National Natural Science Foundation of China (50907056, 51602266), Sichuan Key Research and Development Program (2017GZ0109), and Sichuan Science and Technology Support Projects (2016GZ0273, 2016GZ0275).

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Authors and Affiliations

  1. Key Laboratory of Advanced Technologies of Materials (Ministry of Education of China), Superconductivity and New Energy R&D Centre, Southwest Jiaotong University, Chengdu, 610031, China

    Qi Jiang, Yike Gao, Junqi Peng, Huan Li, Qingqing Liu, Li Jiang, Xiaoying Lu & Ailin Hu

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  1. Qi Jiang
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  2. Yike Gao
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  3. Junqi Peng
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  4. Huan Li
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  6. Li Jiang
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  7. Xiaoying Lu
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  8. Ailin Hu
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Correspondence to Qi Jiang.

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Jiang, Q., Gao, Y., Peng, J. et al. Effects of polyvinyl alcohol on the electrochemical performance of LiNi0.8Co0.15Al0.05O2 cathode material. J Solid State Electrochem 22, 3807–3813 (2018). https://doi.org/10.1007/s10008-018-4085-x

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  • DOI: https://doi.org/10.1007/s10008-018-4085-x

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