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
Source PublicationJOURNAL OF SOLID STATE ELECTROCHEMISTRY
ISSN1432-8488
Volume16Issue:5Pages:1925-1931
Abstract

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.

KeywordOxalic Acid Cathode Lithium Iron Phosphate Li-ion Batteries
Subject AreaElectrochemistry
DOI10.1007/s10008-011-1585-3
Indexed BySCI
WOS IDWOS:000303451100026
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/2813
Collection新疆维吾尔自治区电子信息材料与器件重点实验室
Corresponding AuthorKang, XY
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[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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