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Sol–gel synthesis of sodium and lithium based materials

Hildebrandt, Sandra and Eva, Andreas and Komissinskiy, Philipp and Fasel, Claudia and Fritsch, Ingo and Alff, Lambert (2012):
Sol–gel synthesis of sodium and lithium based materials.
In: Journal of Sol-Gel Science and Technology, Springer US, pp. 307-314, 63, (3), ISSN 0928-0707, [Online-Edition: http://dx.doi.org/10.1007/s10971-012-2789-4],
[Article]

Abstract

Sodium and lithium cobaltates are important materials for thermoelectric and battery applications due to their large thermoelectric power and ability to (de-) intercalate the alkali metal. For these applications, phase pure materials with controlled microstructure are required. We report on the sol–gel synthesis of sodium- and lithium-based materials by using acetate precursors. The produced Na2/3CoO2, Li(Ni1/3Mn1/3Co1/3)O2, and Li(Ni1/2Co1/2)O2 powders are phase pure with grain sizes below 1 μm. X-ray diffraction and energy-dispersive spectral analyses show that the cation stoichiometry is preserved in the lithium-based compounds. Despite the low temperatures, the sodium content is reduced by 1/3 as compared to the initial value. Chemical phases of the investigated powders are formed in the sol–gel route at temperatures typically 100–200 K lower than those used in the conventional solid-state synthesis of these materials. The suggested sol–gel synthesis is a low temperature process suited for production of phase pure and homogeneous materials with volatile cations.

Item Type: Article
Erschienen: 2012
Creators: Hildebrandt, Sandra and Eva, Andreas and Komissinskiy, Philipp and Fasel, Claudia and Fritsch, Ingo and Alff, Lambert
Title: Sol–gel synthesis of sodium and lithium based materials
Language: English
Abstract:

Sodium and lithium cobaltates are important materials for thermoelectric and battery applications due to their large thermoelectric power and ability to (de-) intercalate the alkali metal. For these applications, phase pure materials with controlled microstructure are required. We report on the sol–gel synthesis of sodium- and lithium-based materials by using acetate precursors. The produced Na2/3CoO2, Li(Ni1/3Mn1/3Co1/3)O2, and Li(Ni1/2Co1/2)O2 powders are phase pure with grain sizes below 1 μm. X-ray diffraction and energy-dispersive spectral analyses show that the cation stoichiometry is preserved in the lithium-based compounds. Despite the low temperatures, the sodium content is reduced by 1/3 as compared to the initial value. Chemical phases of the investigated powders are formed in the sol–gel route at temperatures typically 100–200 K lower than those used in the conventional solid-state synthesis of these materials. The suggested sol–gel synthesis is a low temperature process suited for production of phase pure and homogeneous materials with volatile cations.

Journal or Publication Title: Journal of Sol-Gel Science and Technology
Volume: 63
Number: 3
Publisher: Springer US
Uncontrolled Keywords: Sol–gel synthesis, Sodium cobaltat, Lithium cobaltates, Low-temperature method
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 07 Jan 2014 09:53
Official URL: http://dx.doi.org/10.1007/s10971-012-2789-4
Identification Number: doi:10.1007/s10971-012-2789-4
Funders: This study was supported by the AL560/6-1 project of the Deutsche Forschungsgemeinschaft.
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