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Significant improvement in the electrochemical properties of a uniformly Ti-doped high-Ni cathode material fabricated using a wet process

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Abstract

To improve the poor structural safety and cycling performance of high-Ni cathode materials, we used a wet synthesis method instead of the conventional solid-phase synthesis method. In this study, uniformly Ti-doped LiNi0.9Co0.05Ti0.05O2 (Ti-NC95) with remarkable structural safety was synthesized using a Ti-containing solution as the doping material. The discharge capacity retention rate of Ti-NC95 was 97.2% after 50 charge–discharge cycles at a rate of 1 °C. Moreover, the cycling performance of Ti-NC95 was superior to that of NC95, as indicated by its large discharge capacity retention of 28.8%. X-ray diffraction analysis demonstrated that the high binding energy of Ti–O (682 kJ/mol) caused an increase in the I(003)/I(104) ratio from 1.16 for NC95 to 1.24 for Ti-NC95, indicating that the degree of cation mixing of Ti-NC95 was lower than that of NC95.

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Acknowledgements

This study was supported by the Ministry of SMEs and Startups, Republic of Korea (S3045542); Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education. (No. 2019R1A6C1010045); the Technology Innovation Program (20003747, Development of high-performance cathode material manufacturing technology through valuable metal upcycling from waste batteries and waste cathode material) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea); and the Korea Agency for Infrastructure Technology; the National Research Foundation of Korea(NRF) funded by the Korea government (MSIT) (No.2021R1F1A1063481)

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  1. Department of Nano-Polymer Science & Engineering, Korea National University of Transportation, 50, Daehak-ro, Daesowon-myeon, Chungju-si, Chungcheongbuk-do, Republic of Korea

    Eui Jeong Park, Seong Hee Lee, Hae In Kim, Hyun Ju Jang, Thi Bich Thuy Tran & Jong Tae Son

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  1. Eui Jeong Park
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Park, E.J., Lee, S.H., Kim, H.I. et al. Significant improvement in the electrochemical properties of a uniformly Ti-doped high-Ni cathode material fabricated using a wet process. J. Korean Phys. Soc. 81, 688–696 (2022). https://doi.org/10.1007/s40042-022-00553-4

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  • DOI: https://doi.org/10.1007/s40042-022-00553-4

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