Open AccessOxidation State analysis of LiFeSixP1-xO4/C (x = 0.06) with X-ray Absorption Near Edge Structure (XANES) in Fe K-edge and Si K-edge
Author(s) -
Sahara Hamas Intifadhah,
Vera Laviara Maghfirohtuzzoimah,
Pelangi Az-Zahra,
Wantana Klysubun,
Fahmi Astuti,
Mochamad Zainuri,
Darminto Darminto
Publication year - 2021
Publication title -
journal of physics
Language(s) - English
Resource type - Journals
eISSN - 2549-7324
pISSN - 2549-7316
DOI - 10.20961/jphystheor-appl.v5i1.51855
Subject(s) - xanes , analytical chemistry (journal) , x ray absorption spectroscopy , k edge , doping , materials science , x ray photoelectron spectroscopy , absorption (acoustics) , x ray absorption fine structure , absorption spectroscopy , chemistry , spectroscopy , physics , nuclear magnetic resonance , optoelectronics , chromatography , quantum mechanics , composite material
The development of LiFePO 4 as a cathode materials on lithium-ion battery was increased with the use of additional techniques such as atomic doping and coating. The material used in this report was LiFeSi 0.06 P 0.94 O 4 /C (LFP Si-6%), synthesized with doping silicon 6% and 11wt% carbon coating by a solid state method. X-ray Absorption Spectroscopy (XAS) characterization was used to investigate the effect on electronic and atomic structure of LFP Si-6%, especially in X-ray Absorption Near Edge Strucuture (XANES) region. XANES data measured on Fe K-edge and Si K-edge. Fe foil, FeO, Fe 2 O 3 , FePO 4 , Si powder, SiO, SiO 2 were used as a standard sample for comparison with the result of LFP Si-6%. XANES analysis showed that the energy absorption of Fe K-edge and Si K-edge in LFP Si-6% was 7124.94 eV and 1846.16 eV, respectively. The oxidation state of Fe was Fe 2.576+ between Fe 2+ and Fe 3+ , while Si was close to the estimation of Si 4+ . In addition, the linear combination fitting (LCF) in XANES Fe K-edge was performed to show the ratio of Fe 2+ /Fe 3+ (FeO/Fe 2 O 3 ).