University Chemistry ›› 2024, Vol. 39 ›› Issue (12): 369-377.doi: 10.12461/PKU.DXHX202404054

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Molecular Orbital Theory Description and Computational Study of Ion-Coupled Electron Transfer in Olivine-Type Materials

Yu Gao1, Xiaoxiao Wang2, Yingying Li1, Shengli Chen2   

  1. 1 School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang 236037, Anhui Province, China;
    2 College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
  • Received:2024-04-10 Accepted:2024-05-08 Published:2024-06-06
  • Contact: Yu Gao E-mail:gaoyu@fynu.edu.cn

Abstract: The electronic coupling matrix elements play a crucial role in the ion-coupled electron transfer processes in olivine-type phosphate cathode materials. By combining Density Functional Theory (DFT) calculations with molecular orbital theory, this study reveals a positive correlation between the magnitude of the electronic coupling matrix elements and the electron density distribution near the Fermi level of the transition metal centers in olivine-type cathode materials. Furthermore, the study establishes a quantitative relationship between the electronic structure of the metal centers and the Li+ diffusion coefficients. These findings provide new theoretical insights for the development of high-performance lithium-ion battery cathode materials by optimizing the electronic coupling in host materials.

Key words: Molecular orbital theory, Electronic coupling matrix elements, Ion-coupled electron transfer, DFT calculation