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Oxalic acid-assisted preparation of LiFePO4/C cathode material for lithium-ion batteries
Dou, Junqing; Kang, Xueya; Wumaier, Tuerdi; Hua, Ning; Han, Ying; Xu, Guoqing
2012
会议名称ICMAT Symposium N
页码1925-1931
会议日期JUN 26-JUL 01, 2011
会议地点SINGAPORE
出版地Springer New York, 233 Spring Street, New York, NY 10013-1578, United States
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.

关键词Oxalic Acid Cathode Lithium Iron Phosphate Li-ion Batteries
收录类别SCI
文献类型会议论文
条目标识符http://ir.xjipc.cas.cn/handle/365002/3613
专题材料物理与化学研究室
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
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Dou, Junqing,Kang, Xueya,Wumaier, Tuerdi,et al. Oxalic acid-assisted preparation of LiFePO4/C cathode material for lithium-ion batteries[C]. Springer New York, 233 Spring Street, New York, NY 10013-1578, United States,2012:1925-1931.
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