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; Kang, XY
2012
发表期刊JOURNAL OF SOLID STATE ELECTROCHEMISTRY
ISSN1432-8488
卷号16期号:5页码:1925-1931
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.

关键词Oxalic Acid Cathode Lithium Iron Phosphate Li-ion Batteries
学科领域Electrochemistry
DOI10.1007/s10008-011-1585-3
收录类别SCI
WOS记录号WOS:000303451100026
引用统计
文献类型期刊论文
条目标识符http://ir.xjipc.cas.cn/handle/365002/2813
专题新疆维吾尔自治区电子信息材料与器件重点实验室
通讯作者Kang, XY
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[J]. JOURNAL OF SOLID STATE ELECTROCHEMISTRY,2012,16(5):1925-1931.
APA Dou Junqing.,Kang Xueya.,Wumaier Tuerdi.,Hua Ning.,Han Ying.,...&Kang, XY.(2012).Oxalic acid-assisted preparation of LiFePO4/C cathode material for lithium-ion batteries.JOURNAL OF SOLID STATE ELECTROCHEMISTRY,16(5),1925-1931.
MLA Dou Junqing,et al."Oxalic acid-assisted preparation of LiFePO4/C cathode material for lithium-ion batteries".JOURNAL OF SOLID STATE ELECTROCHEMISTRY 16.5(2012):1925-1931.
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