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Title: Effects of Nb-doped on the structure and electrochemical performance of LiFePO{sub 4}/C composites

Abstract

The olivine-type niobium doping Li{sub 1−x}Nb{sub x}FePO{sub 4}/C (x=0, 0.005, 0.010, 0.015, 0.025) cathode materials were synthesized via a two-step ball milling solid state reaction. The effects of Nb doping were charactered by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), galvanostatic intermittent titration technique (GITT), cyclic voltammetry (CV), electrochemical impedance spectra (EIS) and galvanostatic charge–discharge. It is found that Nb doping enlarges the interplanar distance of crystal plane parallel to [0 1 0] direction in LiFePO{sub 4}. In other words, it widens the one dimensional diffusion channels of Li{sup +} along the [0 1 0] direction. Electrochemical test results indicate that the Li{sub 0.99}Nb{sub 0.01}FePO{sub 4}/C composite exhibits the best electrochemical performance with initial special discharge capacity of 139.3 mA h g{sup −1} at 1 C rate. The present synthesis route is promising in making the solid state reaction method more practical for preparation of the LiFePO{sub 4} material. - Graphical abstract: The proper amount of Nb doping widens the one dimensional diffusion channels of Li{sup +} along the [0 1 0] direction. Display Omitted - Highlights: • The Nb doping LiFePO{sub 4}/C is prepared by a facile two-step ball milling solid state reaction. • The sample possesses themore » better high-rate performance. • The tap density of Li{sub 0.99}Nb{sub 0.01}FePO{sub 4}/C sample is 1.76 g cm{sup −3}.« less

Authors:
 [1];  [1]; ; ;  [1]
  1. Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004 (China)
Publication Date:
OSTI Identifier:
22274220
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 210; Journal Issue: 1; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CRYSTALS; DENSITY; DIFFUSION; DOPED MATERIALS; ELECTRIC BATTERIES; FIELD EMISSION; IRON PHOSPHATES; LITHIUM; LITHIUM IONS; NIOBIUM; SCANNING ELECTRON MICROSCOPY; SOLIDS; SPECTRA; SYNTHESIS; TITRATION; VOLTAMETRY; X-RAY DIFFRACTION

Citation Formats

Ma, Zhipeng, Shao, Guangjie, State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao 066004, Wang, Guiling, Zhang, Ying, and Du, Jianping. Effects of Nb-doped on the structure and electrochemical performance of LiFePO{sub 4}/C composites. United States: N. p., 2014. Web. doi:10.1016/J.JSSC.2013.11.032.
Ma, Zhipeng, Shao, Guangjie, State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao 066004, Wang, Guiling, Zhang, Ying, & Du, Jianping. Effects of Nb-doped on the structure and electrochemical performance of LiFePO{sub 4}/C composites. United States. https://doi.org/10.1016/J.JSSC.2013.11.032
Ma, Zhipeng, Shao, Guangjie, State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao 066004, Wang, Guiling, Zhang, Ying, and Du, Jianping. 2014. "Effects of Nb-doped on the structure and electrochemical performance of LiFePO{sub 4}/C composites". United States. https://doi.org/10.1016/J.JSSC.2013.11.032.
@article{osti_22274220,
title = {Effects of Nb-doped on the structure and electrochemical performance of LiFePO{sub 4}/C composites},
author = {Ma, Zhipeng and Shao, Guangjie and State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao 066004 and Wang, Guiling and Zhang, Ying and Du, Jianping},
abstractNote = {The olivine-type niobium doping Li{sub 1−x}Nb{sub x}FePO{sub 4}/C (x=0, 0.005, 0.010, 0.015, 0.025) cathode materials were synthesized via a two-step ball milling solid state reaction. The effects of Nb doping were charactered by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), galvanostatic intermittent titration technique (GITT), cyclic voltammetry (CV), electrochemical impedance spectra (EIS) and galvanostatic charge–discharge. It is found that Nb doping enlarges the interplanar distance of crystal plane parallel to [0 1 0] direction in LiFePO{sub 4}. In other words, it widens the one dimensional diffusion channels of Li{sup +} along the [0 1 0] direction. Electrochemical test results indicate that the Li{sub 0.99}Nb{sub 0.01}FePO{sub 4}/C composite exhibits the best electrochemical performance with initial special discharge capacity of 139.3 mA h g{sup −1} at 1 C rate. The present synthesis route is promising in making the solid state reaction method more practical for preparation of the LiFePO{sub 4} material. - Graphical abstract: The proper amount of Nb doping widens the one dimensional diffusion channels of Li{sup +} along the [0 1 0] direction. Display Omitted - Highlights: • The Nb doping LiFePO{sub 4}/C is prepared by a facile two-step ball milling solid state reaction. • The sample possesses the better high-rate performance. • The tap density of Li{sub 0.99}Nb{sub 0.01}FePO{sub 4}/C sample is 1.76 g cm{sup −3}.},
doi = {10.1016/J.JSSC.2013.11.032},
url = {https://www.osti.gov/biblio/22274220}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 1,
volume = 210,
place = {United States},
year = {Sat Feb 15 00:00:00 EST 2014},
month = {Sat Feb 15 00:00:00 EST 2014}
}