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Issue 26, 2008
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New titanoniobates (Li,H)2TiNbO5 and (Li,H)3TiNbO5: synthesis, structure and properties

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Abstract

The electrochemical reduction of the layered titanoniobate HTiNbO5 has allowed two new phases, (Li,H)2TiNbO5 and (Li,H)3TiNbO5, to be synthesized, the structures of which have been studied by X-ray diffraction and electron microscopy. (Li,H)2TiNbO5 is closely related to the LiTiNbO5 phase, with a “parallel configuration” of the |TiNbO6| ribbons between two successive [TiNbO5]nn layers. One lithium could be reversibly inserted at 1.6 V for a capacity of 120 mAh g−1. This phase exhibits a strong contrast in color between the charge and discharge steps, suggesting a potential electrochromic material. (Li,H)3TiNbO5 reveals a distorted and ordered rock salt-type structure. A structural model is proposed for the mechanism of intercalation.

Graphical abstract: New titanoniobates (Li,H)2TiNbO5 and (Li,H)3TiNbO5: synthesis, structure and properties

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Article information


Submitted
24 Jan 2008
Accepted
03 Apr 2008
First published
07 May 2008

J. Mater. Chem., 2008,18, 3121-3128
Article type
Paper

New titanoniobates (Li,H)2TiNbO5 and (Li,H)3TiNbO5: synthesis, structure and properties

J.-F. Colin, V. Pralong, M. Hervieu, V. Caignaert and B. Raveau, J. Mater. Chem., 2008, 18, 3121
DOI: 10.1039/B801368C

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