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Investigation on LiCoPO4 powders as cathode materials annealed under different atmospheres

Dimesso, Lucangelo and Jacke, Susanne and Spanheimer, Christina and Jaegermann, Wolfram (2012):
Investigation on LiCoPO4 powders as cathode materials annealed under different atmospheres.
In: Journal of Solid State Electrochemistry, 16 (3), Springer-Verlag, pp. 911-919, ISSN 1432-8488,
[Online-Edition: http://dx.doi.org/10.1007/s10008-011-1441-5],
[Article]

Abstract

An uncomplicated Pechini-assisted sol–gel process in aqueous solutions is used for the synthesis of Li–Co phosphate powders as cathode materials. The powders are annealed under different conditions in flowing nitrogen and in flowing air. The structural, morphological, and electrochemical properties are strongly dependent upon the annealing conditions. After the treatment in air, the X-ray diffraction (XRD) patterns reveal the presence of LiCoPO4 as a single phase. The morphology of the powders consists of a homogeneous and good interconnected blend of grains with different sizes; the cyclic voltammetry (CV) curves show a very good reversibility with very close values of the mean peak maxima in the cathodic region. The electrochemical measurements deliver a discharge specific capacity of 37 mAhg−1 at a discharge rate of C/25 at room temperature. After annealing in nitrogen, the XRD analysis detects the formation of Li4P2O7 and to Co2 Passecondary phases; the morphological investigation indicated that the LiCoPO4 particles took shape of prisms with an average size of 2μm. The CV curves are associated with a large polarization and poor irreversibility. The electrochemical measurements deliver a discharge specific capacity of 42 mAh g−1 at a discharge rate of C/25 at room temperature and lower capacity fade (approx. 35%).

Item Type: Article
Erschienen: 2012
Creators: Dimesso, Lucangelo and Jacke, Susanne and Spanheimer, Christina and Jaegermann, Wolfram
Title: Investigation on LiCoPO4 powders as cathode materials annealed under different atmospheres
Language: English
Abstract:

An uncomplicated Pechini-assisted sol–gel process in aqueous solutions is used for the synthesis of Li–Co phosphate powders as cathode materials. The powders are annealed under different conditions in flowing nitrogen and in flowing air. The structural, morphological, and electrochemical properties are strongly dependent upon the annealing conditions. After the treatment in air, the X-ray diffraction (XRD) patterns reveal the presence of LiCoPO4 as a single phase. The morphology of the powders consists of a homogeneous and good interconnected blend of grains with different sizes; the cyclic voltammetry (CV) curves show a very good reversibility with very close values of the mean peak maxima in the cathodic region. The electrochemical measurements deliver a discharge specific capacity of 37 mAhg−1 at a discharge rate of C/25 at room temperature. After annealing in nitrogen, the XRD analysis detects the formation of Li4P2O7 and to Co2 Passecondary phases; the morphological investigation indicated that the LiCoPO4 particles took shape of prisms with an average size of 2μm. The CV curves are associated with a large polarization and poor irreversibility. The electrochemical measurements deliver a discharge specific capacity of 42 mAh g−1 at a discharge rate of C/25 at room temperature and lower capacity fade (approx. 35%).

Journal or Publication Title: Journal of Solid State Electrochemistry
Volume: 16
Number: 3
Publisher: Springer-Verlag
Uncontrolled Keywords: Sol-gel, Cathode materials, Lithium cobalt, phosphate, Annealing, Nitrogen, Air
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 Nov 2013 10:24
Official URL: http://dx.doi.org/10.1007/s10008-011-1441-5
Identification Number: doi:10.1007/s10008-011-1441-5
Funders: The authors thank the Deutsche Forschungsgemeinschaft (DFG) ( Sonderinitiativeproject: PAK-177 ) for the financial support during this work. , The DFG encourage and financially support the publication of the results during the projects., The DFG have no involvement in the study design, in analysis and interpretation of data, in the writing of the report, and in the decision to submit the paper for publication.
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