Local Structure and Magnetism of LiFeSi0.01P0.99O4/C as a Cathode Material on Lithium-Ion Battery


  • Vera Laviara Maghfirohtuzzoimah Institut Teknologi Sepuluh Nopember
  • Sahara Hamas Intifadhah Institut Teknologi Sepuluh Nopember
  • Pelangi Az-zahra Institut Teknologi Sepuluh Nopember
  • Wantana Klysubun Synchotron Light Research Institute
  • Dita Puspita Sari 1. Shibaura Institute of Technology 2. RIKEN Nishina Center
  • Isao Watanabe RIKEN Nishina Center
  • Mochamad Zainuri Institut Teknologi Sepuluh Nopember
  • Fahmi Astuti 1. Institut Teknologi Sepuluh Nopember 2. RIKEN Nishina Center




Cathode material, Lithium-ion battery, Local structure, Oxidation state, X-ray absorption spectroscopy, Magnetism


The oxidation state and local structure of LiFeSi0.01P0.99O4/C composites as a cathode on lithium-ion battery were investigated by Fe K-edge X-ray Absorption Near Edge Spectroscopy (XANES) and Extended X-ray Absorption Fine Structure (EXAFS). The LiFeSi0.01P0.99O4/C sample was prepared by solid-state reaction process. Based on the XANES analysis, the absorption of edge energy (E0) of the sample was 7124.92 eV. In addition, linear combination fitting (LCF) analysis of XANES confirmed the oxidation state of iron mixture of 2+ and 3+ as the effect of silicon doped in LiFePO4. The Fourier Transform (FT) of the Fe K-edge EXAFS fitting analysis showed that the nearest neighbors surrounding atom Fe were the main peak with high intensity that confirmed Fe-O bond; the second and third peak with lower intensity confirmed Fe-P and Fe-Fe bonds, respectively. In addition, the SQUID magnetometer result of LiFeSi0.01P0.99O4/C indicated the antiferromagnetic order temperature of LiFeSi0.01P0.99O4/C at ~51 K with the indication of the presence of impurity and structural distortion.


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