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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
会议文集: Journal of Solid State Electrochemistry
会议名称: ICMAT Symposium N
会议日期: JUN 26-JUL 01, 2011
出版日期: 2012
会议地点: SINGAPORE
出版者: JOURNAL OF SOLID STATE ELECTROCHEMISTRY
出版地: United States
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.

内容类型: 会议论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/2295
Appears in Collections:材料物理与化学研究室_会议论文

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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[C]. 见:ICMAT Symposium N. SINGAPORE. JUN 26-JUL 01, 2011.
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