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题名: Oxalic acid-assisted preparation of LiFePO<inf>4</inf>/C cathode material for lithium-ion batteries
作者: Dou, Junqing (1) ; Kang, Xueya (1) ; Wumaier, Tuerdi (1) ; Hua, Ning (1) ; Han, Ying (1) ; Xu, Guoqing (1)
出版日期: 2012
关键词: Oxalic acid ; Cathode ; Lithium iron phosphate ; Li-ion batteries
通讯作者: Kang, X.(xueyakang@yahoo.cn)
出版地: Springer New York, 233 Spring Street, New York, NY 10013-1578, United States
收录类别: SCI ; EI
ISSN: 14328488
部门归属: (1) Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China ; (2) Graduate University of Chinese Academy of Sciences, Beijing 100049, China ; (3) Xinjiang Key Laboratories of Electronic Information Materials and Devices, Urumqi, Xinjiang 830011, China
摘要: LiFePO4/C composite is synthesized by oxalic acid-assisted rheological phase method. Fe2O3 and LiH2PO 4 are chosen as the starting materials, sucrose as carbon sources, and oxalic acid as the additive. The crystalline structure and morphology of the products are characterized by X-ray diffraction and field emission scanning electron microscopy. The charge-discharge kinetics of LiFePO4 electrode is investigated using cyclic voltammetry and electrochemical impedance spectroscopy. It is found that the introduction of appropriate amount of oxalic acid leads to smaller particle sizes, more homogeneous size distribution, and some Fe2P produced in the final products, resulting in reduced polarization, impedance, and improved Li+ ion diffusion coefficient. The best cell performance is delivered by the sample with R=1.5 (R of the molar ratio of oxalic acid to LiH2PO4). Its discharge capacity is 154 mAh g-1 at 0.2 C rate and 120 mAh g-1 at 5.0 C rate. At the same time, it exhibits an excellent cycling stability; no obvious decrease even after 1,000 cycles at 1.0 C rate.
英文摘要: LiFePO4/C composite is synthesized by oxalic acid-assisted rheological phase method. Fe2O3 and LiH2PO 4 are chosen as the starting materials, sucrose as carbon sources, and oxalic acid as the additive. The crystalline structure and morphology of the products are characterized by X-ray diffraction and field emission scanning electron microscopy. The charge-discharge kinetics of LiFePO4 electrode is investigated using cyclic voltammetry and electrochemical impedance spectroscopy. It is found that the introduction of appropriate amount of oxalic acid leads to smaller particle sizes, more homogeneous size distribution, and some Fe2P produced in the final products, resulting in reduced polarization, impedance, and improved Li+ ion diffusion coefficient. The best cell performance is delivered by the sample with R=1.5 (R of the molar ratio of oxalic acid to LiH2PO4). Its discharge capacity is 154 mAh g-1 at 0.2 C rate and 120 mAh g-1 at 5.0 C rate. At the same time, it exhibits an excellent cycling stability; no obvious decrease even after 1,000 cycles at 1.0 C rate.
语种: 英语
内容类型: 会议论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/3613
Appears in Collections:材料物理与化学研究室_会议论文

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Dou, Junqing (1); Kang, Xueya (1); Wumaier, Tuerdi (1); Hua, Ning (1); Han, Ying (1); Xu, Guoqing (1).Oxalic acid-assisted preparation of LiFePO4/C cathode material for lithium-ion batteries.见:.,Springer New York, 233 Spring Street, New York, NY 10013-1578, United States,2012,1925-1931
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