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Investigation of the LiCo1−xMgxPO4 (0⩽x⩽0.1) system

Dimesso, Lucangelo and Spanheimer, Christina and Jaegermann, Wolfram (2014):
Investigation of the LiCo1−xMgxPO4 (0⩽x⩽0.1) system.
In: Journal of Alloys and Compounds, 582Elsevier Science Publishing, pp. 69-74, ISSN 09258388,
[Online-Edition: http://dx.doi.org/10.1016/j.jallcom.2013.08.034],
[Article]

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 and Spanheimer, Christina and Jaegermann, Wolfram
Title: Investigation of the LiCo1−xMgxPO4 (0⩽x⩽0.1) system
Language: English
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).

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 582
Publisher: Elsevier Science Publishing
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
Official URL: http://dx.doi.org/10.1016/j.jallcom.2013.08.034
Identification Number: doi:10.1016/j.jallcom.2013.08.034
Funders: The authors thank the Deutsche Forschungsgemeinschaft (DFG) (Sonderinitiativeproject: PAK-177) for the financial support during this work.
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