Synthesis and electrochemical properties of xLiFePO4 �(1-x)LiVPO4F composites prepared by aqueous precipitation and carbothermal reduction

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100520

Title:	Synthesis and electrochemical properties of xLiFePO4 �(1-x)LiVPO4F composites prepared by aqueous precipitation and carbothermal reduction
Authors:	高憲明;Lin, Yi-Chuan;Fey, George Ting-Kuo;Wu, Pin-Jiun;Chang, Jeng-Kuei;Kao, Hsien-Ming
Contributors:	理學院化學學系
Keywords:	Cathode material;Lithium ion batteries;Lithium iron phosphate;Lithium vanadium fluorophosphate
Date:	2013-01-01
Issue Date:	2026-04-21 14:05:09 (UTC+8)
Publisher:	Elsevier;Elsevier B.V
Abstract:	摘要： Phosphate-based compounds with the high working voltage, such as Li3V2(PO4)3, LiVPO4F and LiMnPO4, have been proposed as a new class of cathode materials for lithium-ion batteries. To improve the operating voltage of LiFePO4, we introduce LiVPO4F to prepare xLiFePO4·(1 − x)LiVPO4F (LFP–LVPF) composites through an aqueous precipitation and carbothermal reduction method. A series of LFP-LVPF composites have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and total organic carbon (TOC) analysis. The discharge capacity of LFP–LVPF composites for x:(1 − x) = 1:0, 0.99:0.01, 0.75:0.25, 0.5:0.5, 0.25:0.75 and 0:1 at a 0.2 C-rate is 153, 160, 132, 106, 92 and 78 mAh g−1, respectively. The discharge capacity decreases with increasing mole fraction of LVPF. Moreover, the operating voltage of LFP-LVPF composites for x:(1 − x) = 0.75:0.25, 0.5:0.5 or 0.25:0.75 is higher than that of LFP, and the charge/discharge plateaus around 4.35/4.15 V for LFP-LVPF composites become longer as the value of x decreases. •The operating voltage of LFP–LVPF composites for x:(1 − x) = 0.75:0.25, 0.5:0.5 or 0.25:0.75 is higher than that of LFP.•The mole fraction of LiVPO4F has a dramatic effect on the electrochemical properties.•Vanadium atoms could be doped into the LiFePO4 structure during the synthesis process.•The Li+ diffusion coefficient in the LiFePO4 electrode is larger than that in LiVPO4F. 出版者： Elsevier B.V 出版日期： 2013-12-01 出處： Journal of power sources, 2013-12, Vol.244, p.63-71 資源來源： Elsevier ScienceDirect Journals 版權： 2013 Elsevier B.V. 識別號： ISSN: 0378-7753 識別號： EISSN: 1873-2755 識別號： DOI: 10.1016/j.jpowsour.2013.04.024
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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