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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
Conference NameICMAT Symposium N
Pages1925-1931
Conference DateJUN 26-JUL 01, 2011
Conference PlaceSINGAPORE
Publication PlaceSpringer New York, 233 Spring Street, New York, NY 10013-1578, United States
Abstract

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.

KeywordOxalic Acid Cathode Lithium Iron Phosphate Li-ion Batteries
Indexed BySCI
Document Type会议论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/3613
Collection材料物理与化学研究室
AffiliationXinjiang 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
GB/T 7714
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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