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Influence of the annealing atmosphere on the properties of LiCoPO4–graphitic carbon foams composites

Dimesso, Lucangelo and Spanheimer, Christina and Jaegermann, Wolfram (2014):
Influence of the annealing atmosphere on the properties of LiCoPO4–graphitic carbon foams composites.
In: Ionics, 20 (5), Springer Berlin Heidelberg, pp. 621-628, ISSN 0947-7047,
[Online-Edition: http://dx.doi.org/10.1007/s11581-013-1025-8],
[Article]

Abstract

The investigation on the properties of LiCoPO4–graphitic carbon foams (LCP-GCF) composites is reported in this work. The diffraction analysis (XRD) on powders confirmed the presence of LiCoPO4 as major crystalline phase and Li4P2O7 and Co2P as secondary phases. The morphological investigation of the composites shows a layer of crystalline spongy-like material on the surface of the GCF for t = 0 h and of acicular crystallites with different dimensions (5–50 μm) for t ≥ 0.1 h. The voltammetric curves (cyclic voltammogramms) show mean values of reduction potential above 5.0 V independently of the annealing time. The LCP-GCF composites deliver a discharge-specific capacity of 76mAh g−1 (t = 0 h) and of 102mAh g−1 (t = 0.1 h) at a discharge rate of C/10 and room temperature. The electrochemical impedance spectroscopy data reveal a decrease of the electrical resistance and the improvement of the Li-ion conductivity as a function of the annealing time.

Item Type: Article
Erschienen: 2014
Creators: Dimesso, Lucangelo and Spanheimer, Christina and Jaegermann, Wolfram
Title: Influence of the annealing atmosphere on the properties of LiCoPO4–graphitic carbon foams composites
Language: English
Abstract:

The investigation on the properties of LiCoPO4–graphitic carbon foams (LCP-GCF) composites is reported in this work. The diffraction analysis (XRD) on powders confirmed the presence of LiCoPO4 as major crystalline phase and Li4P2O7 and Co2P as secondary phases. The morphological investigation of the composites shows a layer of crystalline spongy-like material on the surface of the GCF for t = 0 h and of acicular crystallites with different dimensions (5–50 μm) for t ≥ 0.1 h. The voltammetric curves (cyclic voltammogramms) show mean values of reduction potential above 5.0 V independently of the annealing time. The LCP-GCF composites deliver a discharge-specific capacity of 76mAh g−1 (t = 0 h) and of 102mAh g−1 (t = 0.1 h) at a discharge rate of C/10 and room temperature. The electrochemical impedance spectroscopy data reveal a decrease of the electrical resistance and the improvement of the Li-ion conductivity as a function of the annealing time.

Journal or Publication Title: Ionics
Volume: 20
Number: 5
Publisher: Springer Berlin Heidelberg
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: 27 Feb 2015 12:21
Official URL: http://dx.doi.org/10.1007/s11581-013-1025-8
Identification Number: doi:10.1007/s11581-013-1025-8
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