Dimesso, Lucangelo ; Spanheimer, Christina ; Jaegermann, Wolfram (2014)
Investigation of the LiCo1−xMgxPO4 (0≤x≤0.1)–graphitic carbon foam composites.
In: Solid State Sciences, 30
doi: 10.1016/j.solidstatesciences.2014.02.011
Article, Bibliographie
Abstract
LiCo1−xMgxPO4–graphitic carbon foam (LCMP–GCF with 0 ≤ x ≤ 0.1) composites are prepared by Pechini-assisted sol-gel method and annealed with the 2-steps annealing process (T = 300 °C for 5 min in flowing air, then at T = 730 °C for t = 12 h in flowing nitrogen). The XRD analysis, performed on powders reveals LiCoPO4 as major crystalline phase, Co2P and Co2P2O7 as secondary phases. The morphological investigation revealed the formation and growth of microcrystalline “islands” which consist of acicular crystallites with different dimensions (typically 5–50 μm). By addition of Mg-ions, CV-curves of LCMP–GCF composites show a decrease of the surface between anodic and cathodic sweeps by cycling and a stark contribution of faradaic processes due to the graphitic structured foam. The electrochemical measurements, at a discharge rate of C/10 at room temperature, show the decrease of the discharge specific capacity from 100 mAh g−1 for x = 0.0 to ∼35 mAh g−1 for 0.025 ≤ x ≤ 0.05, then an increase to 69 mAh g−1 for x = 0.1. The electrochemical impedance spectroscopy data reveal a decrease of the electrical resistance and the improvement of the Li-ion conductivity at high Mg-ions content into the LiCoPO4 phase (x ≥ 0.025).
| Item Type: | Article |
|---|---|
| Erschienen: | 2014 |
| Creators: | Dimesso, Lucangelo ; Spanheimer, Christina ; Jaegermann, Wolfram |
| Type of entry: | Bibliographie |
| Title: | Investigation of the LiCo1−xMgxPO4 (0≤x≤0.1)–graphitic carbon foam composites |
| Language: | English |
| Date: | April 2014 |
| Publisher: | Elsevier Science Publishing |
| Journal or Publication Title: | Solid State Sciences |
| Volume of the journal: | 30 |
| DOI: | 10.1016/j.solidstatesciences.2014.02.011 |
| Abstract: | LiCo1−xMgxPO4–graphitic carbon foam (LCMP–GCF with 0 ≤ x ≤ 0.1) composites are prepared by Pechini-assisted sol-gel method and annealed with the 2-steps annealing process (T = 300 °C for 5 min in flowing air, then at T = 730 °C for t = 12 h in flowing nitrogen). The XRD analysis, performed on powders reveals LiCoPO4 as major crystalline phase, Co2P and Co2P2O7 as secondary phases. The morphological investigation revealed the formation and growth of microcrystalline “islands” which consist of acicular crystallites with different dimensions (typically 5–50 μm). By addition of Mg-ions, CV-curves of LCMP–GCF composites show a decrease of the surface between anodic and cathodic sweeps by cycling and a stark contribution of faradaic processes due to the graphitic structured foam. The electrochemical measurements, at a discharge rate of C/10 at room temperature, show the decrease of the discharge specific capacity from 100 mAh g−1 for x = 0.0 to ∼35 mAh g−1 for 0.025 ≤ x ≤ 0.05, then an increase to 69 mAh g−1 for x = 0.1. The electrochemical impedance spectroscopy data reveal a decrease of the electrical resistance and the improvement of the Li-ion conductivity at high Mg-ions content into the LiCoPO4 phase (x ≥ 0.025). |
| Uncontrolled Keywords: | Sol-gel, Cathode material, Composite, Lithium cobalt phosphate |
| 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 12:17 |
| Last Modified: | 29 Mar 2015 16:53 |
| PPN: | |
| Funders: | The authors thank the Deutsche Forschungsgemeinschaft (DFG) (Sonderinitiativeproject: PAK-177) for the financial support during this work. |
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