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

Journal of Magnetism and Its Applications

Fahmi Astuti¹  Dita Puspita Sari²  Vera Laviara Maghfirohtuzzoimah³  Pelangi Az-zahra³  Mochamad Zainuri³  Sahara Hamas Intifadhah³  Isao Watanabe⁴  Wantana Klysubun⁵ 

[1] 1. Institut Teknologi Sepuluh Nopember2. RIKEN Nishina Center;1. Shibaura Institute of Technology2. RIKEN Nishina Center;Institut Teknologi Sepuluh Nopember;RIKEN Nishina Center;Synchotron Light Research Institute;

关键词: cathode material;    lithium-ion battery;    local structure;    oxidation state;    x-ray absorption spectroscopy;    magnetism;   

DOI  :  10.53533/JMA.v1i1.6

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown