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Investigation of the LiCo1−xMgxPO4 (0≤x≤0.1)–graphitic carbon foam composites

Dimesso, Lucangelo and Spanheimer, Christina and Jaegermann, Wolfram (2014):
Investigation of the LiCo1−xMgxPO4 (0≤x≤0.1)–graphitic carbon foam composites.
In: Solid State Sciences, 30Elsevier Science Publishing, pp. 89-93, ISSN 12932558,
[Online-Edition: http://dx.doi.org/10.1016/j.solidstatesciences.2014.02.011],
[Article]

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 and Spanheimer, Christina and Jaegermann, Wolfram
Title: Investigation of the LiCo1−xMgxPO4 (0≤x≤0.1)–graphitic carbon foam composites
Language: English
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).

Journal or Publication Title: Solid State Sciences
Volume: 30
Publisher: Elsevier Science Publishing
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
Official URL: http://dx.doi.org/10.1016/j.solidstatesciences.2014.02.011
Identification Number: doi:10.1016/j.solidstatesciences.2014.02.011
Funders: The authors thank the Deutsche Forschungsgemeinschaft (DFG) (Sonderinitiativeproject: PAK-177) for the financial support during this work.
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