Dimesso, Lucangelo ; Cherkashinin, Gennady ; Spanheimer, Christina ; Jaegermann, Wolfram (2012)
Preparation and characterization of carbon foams–LiCoPO4 composites.
In: Journal of Alloys and Compounds, 516
doi: 10.1016/j.jallcom.2011.11.147
Article, Bibliographie
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 ; Cherkashinin, Gennady ; Spanheimer, Christina ; Jaegermann, Wolfram |
| Type of entry: | Bibliographie |
| Title: | Preparation and characterization of carbon foams–LiCoPO4 composites |
| Language: | English |
| Date: | 5 March 2012 |
| Publisher: | Elsevier Science Publishing |
| Journal or Publication Title: | Journal of Alloys and Compounds |
| Volume of the journal: | 516 |
| DOI: | 10.1016/j.jallcom.2011.11.147 |
| 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. |
| 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 |
| Last Modified: | 26 Mar 2015 20:35 |
| PPN: | |
| 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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