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Preparation and characterization of carbon foams–LiCoPO4 composites

Dimesso, Lucangelo and Cherkashinin, Gennady and Spanheimer, Christina and Jaegermann, Wolfram (2012):
Preparation and characterization of carbon foams–LiCoPO4 composites.
In: Journal of Alloys and Compounds, 516Elsevier Science Publishing, pp. 119-125, ISSN 09258388,
[Online-Edition: http://dx.doi.org/10.1016/j.jallcom.2011.11.147],
[Article]

Abstract

The preparation and characterization of composites consisting of carbon foams coated with olivine structured lithium cobalt phosphate is reported. The composites are prepared by a Pechini assisted sol–gel process and treated under different conditions in flowing nitrogen and in flowing air. The structural, morphological and electrochemical properties were found to be dependent upon the annealing conditions as time and atmosphere. After annealing in nitrogen, the formation of the LiCoPO 4 phase on the foams is observed at T = 730 ◦ C. The photoelectron emission spectra reveal divalent cobalt ions in the composites. The LiCoPO 4 /foam composites deliver a discharge specific capacity of 100 mAh g – 1 , at a discharge rate of C/25 and room temperature. After a pre-annealing in air then the annealing in nitrogen, the voltammetric curves show values of the reduction/oxidation processes at 4.6 V and 5.2 V respectively. The electrochemical measurements revealed a decrease of the capacity fade ( ∼ 26% at C/10, RT). A plateau in the specific capacity as a function of the potential has been observed.

Item Type: Article
Erschienen: 2012
Creators: Dimesso, Lucangelo and Cherkashinin, Gennady and Spanheimer, Christina and Jaegermann, Wolfram
Title: Preparation and characterization of carbon foams–LiCoPO4 composites
Language: English
Abstract:

The preparation and characterization of composites consisting of carbon foams coated with olivine structured lithium cobalt phosphate is reported. The composites are prepared by a Pechini assisted sol–gel process and treated under different conditions in flowing nitrogen and in flowing air. The structural, morphological and electrochemical properties were found to be dependent upon the annealing conditions as time and atmosphere. After annealing in nitrogen, the formation of the LiCoPO 4 phase on the foams is observed at T = 730 ◦ C. The photoelectron emission spectra reveal divalent cobalt ions in the composites. The LiCoPO 4 /foam composites deliver a discharge specific capacity of 100 mAh g – 1 , at a discharge rate of C/25 and room temperature. After a pre-annealing in air then the annealing in nitrogen, the voltammetric curves show values of the reduction/oxidation processes at 4.6 V and 5.2 V respectively. The electrochemical measurements revealed a decrease of the capacity fade ( ∼ 26% at C/10, RT). A plateau in the specific capacity as a function of the potential has been observed.

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 516
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Battery, Lithium, cobalt, phosphate, Sol–gel, process, Composites, 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 10:11
Official URL: http://dx.doi.org/10.1016/j.jallcom.2011.11.147
Identification Number: doi:10.1016/j.jallcom.2011.11.147
Funders: The authors thank the Deutsche Forschungsgemeinschaft (DFG) (Project: Sonderforschungsinitiative Projekt PAK-177 ) for the financial support during this work., The DFG promote and support financially the publication of the scientific results obtained during the projects., The DFG had no involvement in study design; in the collection, 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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