XAS study of LiFePO₄ synthesized by solid state reactions and hydrothermal method

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• 作者：Ting Zhao ; Wangsheng Chu ; Haifeng Zhao ; Xianqing Liang ; Wei Xu ; Meijuan Yu ; Dingguo Xia ; Ziyu Wu
• 关键词：Lithium ion battery ; LiFePO₄ ; XAS ; Structure disorder
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2010
• 出版时间：1 July 2010-21 July 2010
• 年：2010
• 卷：619
• 期：1-3
• 页码：122-127
• 全文大小：565 K

文摘

LiFePO₄ composite was synthesized by both solid state and hydrothermal methods. The physical properties of the as-prepared lithium iron phosphates were characterized by X-ray diffraction while electrochemical properties were measured with charge/discharge experiments. X-ray absorption spectroscopy (XAS) was performed to investigate the local structure arrangements of LiFePO₄. Both X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectra collected at the Fe K-edge shed light on structural differences between LiFePO₄ samples synthesized with the two methods, partially accounting for their different electrochemical properties.