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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
Source PublicationJournal of Solid State Electrochemistry
Pages1925-1931
Conference DateJUN 26-JUL 01, 2011
Conference PlaceSINGAPORE
Publication PlaceUnited States
PublisherJOURNAL OF SOLID STATE ELECTROCHEMISTRY
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.

Document Type会议论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/2295
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]. United States:JOURNAL OF SOLID STATE ELECTROCHEMISTRY,2012:1925-1931.
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