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

Journal of Magnetism and Its Applications Pub Date : 2021-06-02 DOI:10.53533/jma.v1i1.6

V. L. Maghfirohtuzzoimah, S. H. Intifadhah, Pelangi Az-zahra, W. Klysubun, D. P. Sari, I. Watanabe, M. Zainuri, F. Astuti

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引用次数: 1

Abstract

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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锂离子电池正极材料lifei0.01 p0.99 o4 /C的局部结构和磁性研究

采用Fe - k边缘x射线吸收近边缘光谱(XANES)和扩展x射线吸收精细结构(EXAFS)研究了lifei0.01 p0.99 o4 /C复合材料作为锂离子电池正极材料的氧化态和局部结构。采用固相反应法制备了lifei0.01 p0.99 o4 /C样品。基于XANES分析，样品的边缘能(E0)吸收为7124.92 eV。此外，XANES的线性组合拟合(LCF)分析证实了2+和3+铁混合物的氧化状态是硅掺杂LiFePO4的影响。Fe K-edge EXAFS拟合分析的傅里叶变换(FT)表明，Fe原子周围的最近邻是主峰，强度高，证实了Fe- o键;强度较低的第2峰和第3峰分别证实了Fe-P键和Fe-Fe键。此外，lifei0.01 p0.99 o4 /C的SQUID磁强计结果表明，lifei0.01 p0.99 o4 /C在~51 K时的反铁磁有序温度，表明存在杂质和结构畸变。

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Journal of Magnetism and Its Applications

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