On a new calcium vanadate: synthesis, structure and Li insertion behavior |
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Authors: | S Jouanneau D Guyomard |
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Institution: | Laboratoire de Chimie des Solides, Institut des Matèriaux Jean Rouxel, 2, rue de la Houssinière, BP 32229, 44322 Nantes Cedex 03, France |
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Abstract: | A synthetic form of the mineral hewettite was prepared via a new route in aqueous medium, starting either from the crystalline compound Li1.1V3O8, or from its amorphous precursor. The anhydrous, crystalline derivative Ca0.5V3O8 was obtained by heating the synthetic hewettite at 250°C under dynamic vacuum. The diffraction studies show that the 2D structure of Ca0.5V3O8 involves the same V3O8 layers as in the hewettite or in Li1+αV3O8. The stacking of the layers is similar to that in the metahewettite. A structural model is proposed, where the Ca2+ ions occupy octahedral sites in the interlayer space. The electrochemical behavior of Ca0.5V3O8 vs. lithium insertion is presented. It is original and reveals particularly good performances in terms of stability during cycling at C/5 rate. The homologues obtained with Mg or Ba, instead of Ca, are briefly presented. |
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Keywords: | Vanadium oxide Vanadate Calcium Hewettite Structure Lithium insertion Lithium battery |
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