Structural and electrochemical characterization of 0.7LiFePO₄¡¤0.3Li₃V₂(PO₄)₃/C cathode materials using PEG and glucose as carbon sources

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• 作者：Pingping Ma ; Pu Hu ; Zhijian Liu ; Jianhua Xia ; Dingguo Xia ; Yu Chen ; Zhengang Liu ; Zhichao Lu
• 关键词：Lithium-ion battery ; Cathode materials ; LiFePO4 ; Li3V2(PO4)3 ; Carbon sources
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：1 September, 2013
• 年：2013
• 卷：106
• 期：Complete
• 页码：187-194
• 全文大小：2110 K

文摘

0.7LiFePO₄¡¤0.3Li₃V₂(PO₄)₃/C composites (LFVP/C) were synthesized via spray-drying technique followed by solid-state reaction approach using polyethylene glycol (PEG) and glucose as carbon sources. The samples were characterized by X-ray diffraction (XRD), X-ray absorption fine-structure spectroscopy (XAFS) and Raman spectroscopy. The results show that the bi-phase composite structure of LFVP/C contains olivine LiFePO₄ (LFP) and monoclinic Li₃V₂(PO₄)₃ (LVP). The lower intensity ratio of the I_D/I_G and for PEG-200 indicates the formation of higher degree of graphitized carbon during the process, which would enhance the electronic conductivity. The composite obtained using PEG-200 as carbon source show excellent rate performance, delivering the discharge capacity of 120 mAh/g at the current density of 1.5 A/g.