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Enhanced Cycling Performance of LiNi0.9Co0.08Al0.02O2 via Co-Rich Surface

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Abstract

High-capacity LiNi0.90Co0.08Al0.02O2 with a Co-rich surface has been synthesized by a coprecipitation technique. The results of elemental, morphology, and structure analyses suggest that Co(OH)2 was uniformly coated on the nickel-cobalt-aluminum hydroxide precursor, providing a Co-rich surface layer on the Ni-based cathode material. Electrochemical tests and pH measurements demonstrated that the Co-rich coating increased the Li storage ability of the cathode. The cathode displayed high discharge capacity of ~ 207 mAh g−1 and 194 mAh g−1 at rates of 0.2°C and 1°C, respectively, and high-capacity retention of 90.2% after 100 cycles at rate of 1°C, representing better performance than that of the reference sample. The Co surface enrichment also decreased the pH of the material and restrained the formation of high-resistance Li-based residues during air exposure, illustrating that such a Co-rich surface can improve the storage stability of LiNi0.90Co0.08Al0.02O2.

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Acknowledgements

The authors gratefully acknowledge the National Nature Science Foundation of China (Grant Nos. 51602352, 51772333, 51874358 and 51904135). We thank Natasha Lundin, PhD, from Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Jinlong Huang, Ke Du, Yanbing Cao, Zhongdong Peng & Guorong Hu

  2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Jianguo Duan

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  1. Jinlong Huang
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  2. Jianguo Duan
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  3. Ke Du
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Correspondence to Jianguo Duan or Guorong Hu.

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Huang, J., Duan, J., Du, K. et al. Enhanced Cycling Performance of LiNi0.9Co0.08Al0.02O2 via Co-Rich Surface. JOM 72, 738–744 (2020). https://doi.org/10.1007/s11837-019-03734-y

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  • DOI: https://doi.org/10.1007/s11837-019-03734-y

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