Dimesso, Lucangelo ; Spanheimer, Christina ; Jaegermann, Wolfram (2014)
Investigation of the LiCo1−xMgxPO4 (0⩽x⩽0.1) system.
In: Journal of Alloys and Compounds, 582
doi: 10.1016/j.jallcom.2013.08.034
Article, Bibliographie
Abstract
LiCo1−xMgxPO4 (0 ⩽ x ⩽ 0.1) compounds are prepared by Pechini assisted sol–gel method coupled 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 patterns show LiCoPO4 as major crystalline phase, Co2P and Co2P2O7 as secondary phases independently of the Mg-content. The morphology of the powders consists of a spongy-like structure with plate grains and coarse particles separated on the surface. The CV curves show a very good electrochemical reversibility with very close values of the mean peak maxima in the cathodic region, 4.4 V for x ⩽ 0.05 and 4.6 V for x = 0.1 respectively. The electrochemical measurements, at a discharge rate of C/10 at room temperature, show the increase of the discharge specific capacity from 61 mA h g−1 for x = 0.0–88 mA h g−1 for x = 0.025, then the decrease to 36 mA h 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 low Mg-ions content into the LiCoPO4 system (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) system |
| Language: | English |
| Date: | 5 January 2014 |
| Publisher: | Elsevier Science Publishing |
| Journal or Publication Title: | Journal of Alloys and Compounds |
| Volume of the journal: | 582 |
| DOI: | 10.1016/j.jallcom.2013.08.034 |
| Abstract: | LiCo1−xMgxPO4 (0 ⩽ x ⩽ 0.1) compounds are prepared by Pechini assisted sol–gel method coupled 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 patterns show LiCoPO4 as major crystalline phase, Co2P and Co2P2O7 as secondary phases independently of the Mg-content. The morphology of the powders consists of a spongy-like structure with plate grains and coarse particles separated on the surface. The CV curves show a very good electrochemical reversibility with very close values of the mean peak maxima in the cathodic region, 4.4 V for x ⩽ 0.05 and 4.6 V for x = 0.1 respectively. The electrochemical measurements, at a discharge rate of C/10 at room temperature, show the increase of the discharge specific capacity from 61 mA h g−1 for x = 0.0–88 mA h g−1 for x = 0.025, then the decrease to 36 mA h 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 low Mg-ions content into the LiCoPO4 system (x = 0.025). |
| Uncontrolled Keywords: | Sol–gel, Cathode materials, Lithium cobalt phosphate, Magnesium |
| 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 12:25 |
| Last Modified: | 29 Mar 2015 17:00 |
| PPN: | |
| Funders: | The authors thank the Deutsche Forschungsgemeinschaft (DFG) (Sonderinitiativeproject: PAK-177) for the financial support during this work. |
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