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Accurate estimation of Li/Ni mixing degree of lithium nickel oxide cathode materials |
Penghao Chen(陈鹏浩)1,2,3, Lei Xu(徐磊)1,3,†, Xiqian Yu(禹习谦)1,2,3,‡, and Hong Li(李泓)1,2,3 |
1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; 3 Beijing Frontier Research Center on Clean Energy, Huairou Division, Institute of Physics, Chinese Academy of Sciences, Beijing 101400, China |
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Abstract Li/Ni mixing negatively influences the discharge capacity of lithium nickel oxide and high-nickel ternary cathode materials. However, accurately measuring the Li/Ni mixing degree is difficult due to the preferred orientation of lab-based XRD measurements using Bragg-Brentano geometry. Here, we find that employing spherical harmonics in Rietveld refinement to eliminate the preferred orientation can significantly decrease the measurement error of the Li/Ni mixing ratio. The Li/Ni mixing ratio obtained from Rietveld refinement with spherical harmonics shows a strong correlation with discharge capacity, which means the electrochemical capacity of lithium nickel oxide and high-nickel ternary cathode can be estimated by the Li/Ni mixing degree. Our findings provide a simple and accurate method to estimate the Li/Ni mixing degree, which is valuable to the structural analysis and screening of the synthesis conditions of lithium nickel oxide and high-nickel ternary cathode materials.
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Received: 31 December 2023
Revised: 15 February 2024
Accepted manuscript online: 05 March 2024
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PACS:
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82.47.Aa
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(Lithium-ion batteries)
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82.45.Fk
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(Electrodes)
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Fund: Project supported by the Natural Science Foundation of Beijing (Grant No. Z200013), the Beijing Municipal Science & Technology (Grant No. Z191100004719001), and the National Natural Science Foundation of China (Grant Nos. 52325207 and 22005333). |
Corresponding Authors:
Lei Xu, Xiqian Yu
E-mail: leixu@iphy.ac.cn;xyu@iphy.ac.cn
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Cite this article:
Penghao Chen(陈鹏浩), Lei Xu(徐磊), Xiqian Yu(禹习谦), and Hong Li(李泓) Accurate estimation of Li/Ni mixing degree of lithium nickel oxide cathode materials 2024 Chin. Phys. B 33 058202
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