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Investigation on graphitic carbon foams – LiNiyPO4 (y = 0.8–1.0) composites

Dimesso, Lucangelo and Spanheimer, Christina and Jaegermann, Wolfram (2012):
Investigation on graphitic carbon foams – LiNiyPO4 (y = 0.8–1.0) composites.
14, In: Solid State Sciences, (9), Elsevier Science Publishing, pp. 1372-1377, ISSN 12932558, [Online-Edition: http://dx.doi.org/10.1016/j.solidstatesciences.2012.07.023],
[Article]

Abstract

Graphitic carbon foams coated with olivine-structured lithium nickel phosphate (LiNiyPO4) (y = 0.8–1.0) as possible cathode materials for 5 V applications are investigated. The composites are prepared by soaking the foams into solutions containing lithium, nickel ions and phosphates, treated in flowing air then in flowing nitrogen. The structural, morphological and electrochemical properties are strongly dependent upon the Ni-content. The X-ray diffractograms, performed on powders prepared under very similar conditions, showed the formation of LiNiPO4 phase with Li4P2O7 and Li2Ni3(P2O7)2. The morphological investigation revealed a dramatic change of the layer by decreasing the Ni-content. The voltammetric curves show values of the mean peak maxima in the anodic region between 5.1 and 5.2 V and in the cathodic region between 4.88 for (y = 1.0) and ∼5.18 V for (y = 0.9 and 0.8) respectively. The specific capacity of the composites (at the first cycle, a discharge rate of C/10 and room temperature) increases by decreasing the nickel content into the cathode material reaching a maximum of 122 mAh g−1 for y = 0.8.

Item Type: Article
Erschienen: 2012
Creators: Dimesso, Lucangelo and Spanheimer, Christina and Jaegermann, Wolfram
Title: Investigation on graphitic carbon foams – LiNiyPO4 (y = 0.8–1.0) composites
Language: English
Abstract:

Graphitic carbon foams coated with olivine-structured lithium nickel phosphate (LiNiyPO4) (y = 0.8–1.0) as possible cathode materials for 5 V applications are investigated. The composites are prepared by soaking the foams into solutions containing lithium, nickel ions and phosphates, treated in flowing air then in flowing nitrogen. The structural, morphological and electrochemical properties are strongly dependent upon the Ni-content. The X-ray diffractograms, performed on powders prepared under very similar conditions, showed the formation of LiNiPO4 phase with Li4P2O7 and Li2Ni3(P2O7)2. The morphological investigation revealed a dramatic change of the layer by decreasing the Ni-content. The voltammetric curves show values of the mean peak maxima in the anodic region between 5.1 and 5.2 V and in the cathodic region between 4.88 for (y = 1.0) and ∼5.18 V for (y = 0.9 and 0.8) respectively. The specific capacity of the composites (at the first cycle, a discharge rate of C/10 and room temperature) increases by decreasing the nickel content into the cathode material reaching a maximum of 122 mAh g−1 for y = 0.8.

Journal or Publication Title: Solid State Sciences
Volume: 14
Number: 9
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Battery, Lithium nickel phosphate, Sol–gel process, Composites, Off-stoichiometric compounds
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Zentrale Einrichtungen
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Date Deposited: 25 Nov 2013 09:18
Official URL: http://dx.doi.org/10.1016/j.solidstatesciences.2012.07.023
Identification Number: doi:10.1016/j.solidstatesciences.2012.07.023
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