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学科主题: Electrochemistry
题名: Oxalic acid-assisted preparation of LiFePO4/C cathode material for lithium-ion batteries
作者: Dou Junqing; Kang Xueya; Wumaier Tuerdi; Hua Ning; Han Ying; Xu Guoqing
通讯作者: Kang, XY
关键词: Oxalic acid ; Cathode ; Lithium iron phosphate ; Li-ion batteries
刊名: JOURNAL OF SOLID STATE ELECTROCHEMISTRY
发表日期: 2012
DOI: 10.1007/s10008-011-1585-3
卷: 16, 期:5, 页:1925-1931
收录类别: SCI
资助者: West Light Foundation of the Chinese Academy of Sciences XB200919; Chinese Academy of Sciences 20092A401; Urumqi K111410005
摘要: LiFePO4/C composite is synthesized by oxalic acid-assisted rheological phase method. Fe2O3 and LiH2PO4 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.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/2813
Appears in Collections:新疆维吾尔自治区电子信息材料与器件重点实验室_期刊论文

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作者单位: Xinjiang Key Labs Elect Informat Mat & Devices, Urumqi 830011, Xinjiang, Peoples R China;Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Xinjiang, Peoples R China; Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Dou Junqing,Kang Xueya,Wumaier Tuerdi,et al. Oxalic acid-assisted preparation of LiFePO4/C cathode material for lithium-ion batteries[J]. JOURNAL OF SOLID STATE ELECTROCHEMISTRY,2012,16(5):1925-1931.
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