Dimesso, Lucangelo ; Becker, Dirk ; Spanheimer, Christina ; Jaegermann, Wolfram (2014)
Effect of Ca,Mg-ions on the properties of LiCo0.9M0.1PO4/graphitic carbon composites.
In: Progress in Solid State Chemistry, 42 (4)
doi: 10.1016/j.progsolidstchem.2014.04.011
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
LiCo0.9M0.1PO4 (M = Co2+, Mg2+, Ca2+)/graphitic carbon composites are synthesized by Pechini-assisted sol–gel process and annealed by the 2-steps annealing process (300 °C for 5 min in air, then at 730 °C for 12 h in nitrogen). The structural investigation, performed on powders, reveals the presence of LiCoPO4 as the major crystalline phase and of CoP2O7 (M = Co), of Co2P (M = Mg), of Co2P, Li3PO4, (Ca,Co)3(PO4)2 (M = Ca) as impurities. The morphological investigation of the composites shows the formation of crystalline “islands-like” structures with acicular crystallites with different dimensions (typically 5–50 μm) on the top of them. The voltammetric analysis shows a very good reversibility of the (de)intercalation processes and the presence of two mean peak maxima in the cathodic region at ∼5.01 V and ∼5.05 V respectively. The discharge specific capacities, at a discharge rate of C/10 and room temperature, were 100 mAh g−1 for M = Co, 68 mAh g−1 for M = Mg and 104 mAh g−1 for M = Ca respectively. The electrochemical impedance spectroscopy data reveal a decrease of the electrical resistance and the improvement of the Li-ion conductivity in the Ca and Mg ions containing composites.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Dimesso, Lucangelo ; Becker, Dirk ; Spanheimer, Christina ; Jaegermann, Wolfram |
| Art des Eintrags: | Bibliographie |
| Titel: | Effect of Ca,Mg-ions on the properties of LiCo0.9M0.1PO4/graphitic carbon composites |
| Sprache: | Englisch |
| Publikationsjahr: | Dezember 2014 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Progress in Solid State Chemistry |
| Jahrgang/Volume einer Zeitschrift: | 42 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.1016/j.progsolidstchem.2014.04.011 |
| Kurzbeschreibung (Abstract): | LiCo0.9M0.1PO4 (M = Co2+, Mg2+, Ca2+)/graphitic carbon composites are synthesized by Pechini-assisted sol–gel process and annealed by the 2-steps annealing process (300 °C for 5 min in air, then at 730 °C for 12 h in nitrogen). The structural investigation, performed on powders, reveals the presence of LiCoPO4 as the major crystalline phase and of CoP2O7 (M = Co), of Co2P (M = Mg), of Co2P, Li3PO4, (Ca,Co)3(PO4)2 (M = Ca) as impurities. The morphological investigation of the composites shows the formation of crystalline “islands-like” structures with acicular crystallites with different dimensions (typically 5–50 μm) on the top of them. The voltammetric analysis shows a very good reversibility of the (de)intercalation processes and the presence of two mean peak maxima in the cathodic region at ∼5.01 V and ∼5.05 V respectively. The discharge specific capacities, at a discharge rate of C/10 and room temperature, were 100 mAh g−1 for M = Co, 68 mAh g−1 for M = Mg and 104 mAh g−1 for M = Ca respectively. The electrochemical impedance spectroscopy data reveal a decrease of the electrical resistance and the improvement of the Li-ion conductivity in the Ca and Mg ions containing composites. |
| Freie Schlagworte: | Composites, Cathode material, Lithium cobalt phosphate, Isovalent substitution, Calcium, Magnesium |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 27 Feb 2015 12:14 |
| Letzte Änderung: | 29 Mär 2015 16:52 |
| PPN: | |
| Sponsoren: | The authors thank the Deutsche Forschungsgemeinschaft(DFG) (Sonderinitiativeproject: PAK-177, grant number. JA859/14-3) for the financial support during this work. , The DFG encourage and financially support the publication of the results during the projects. |
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