Journal of Electrochemical Science and Technology

  • 제13권4호
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  • Pages.438-452
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  • 2022
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  • 2093-8551(pISSN)
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  • 2288-9221(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
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Rate Capability of LiFePO4 Cathodes and the Shape Engineering of Their Anisotropic Crystallites

  • Alexander, Bobyl (Division of Solid State Physics, Ioffe Institute) ;
  • Sang-Сheol, Nam (Resarch Institute of Industrial Science and Technology RIST, POSCO Global R&D center) ;
  • Jung-Hoon, Song (Resarch Institute of Industrial Science and Technology RIST, POSCO Global R&D center) ;
  • Alexander, Ivanishchev (Resarch Institute of Industrial Science and Technology RIST, POSCO Global R&D center) ;
  • Arseni, Ushakov (Institute of Chemistry, Saratov State University)
  • 투고 : 2022.03.29
  • 심사 : 2022.06.13
  • 발행 : 2022.11.30
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초록

For cuboid and ellipsoid crystallites of LiFePO4 powders, by X-ray diffraction (XRD) and microscopic (TEM) studies, it is possible to determine the anisotropic parameters of the crystallite size distribution functions. These parameters were used to describe the cathode rate capability within the model of averaging the diffusion coefficient D over the length of the crystallite columns along the [010] direction. A LiFePO4 powder was chosen for testing the developed model, consisting of big cuboid and small ellipsoid crystallites (close to them). When analyzing the parts of big and small rate capabilities, the fitting values D = 2.1 and 0.3 nm2/s were obtained for cuboids and ellipsoids, respectively. When analyzing the results of cyclic voltammetry using the Randles-Sevcik equation and the total area of projections of electrode crystallites on their (010) plane, slightly different values were obtained, D = 0.9 ± 0.15 and 0.5 ± 0.15 nm2/s, respectively. We believe that these inconsistencies can be considered quite acceptable, since both methods of determining D have obvious sources of error. However, the developed method has a clearly lower systematic error due to the ability to actually take into account the shape and statistics of crystallites, and it is also useful for improving the accuracy of the Randles-Sevcik equation. It has also been demonstrated that the shape engineering of crystallites, among other tasks, can increase the cathode capacity by 15% by increasing their size correlation coefficients.

키워드

과제정보

XRD studies were performed in Resource Center of St. Petersburg State University. SEM studies were partly performed in Collective Use Center "Materials Science and Diagnostics in Advanced Technologies", TEM in the Omsk Center for Collective Use. Half of the work done at the Ioffe Institute. AV Ushakov and AV Ivanishchev participate in RSF 21-73-10091 and RFBR 20-03-00381 grants, respectively.

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