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Ionothermal synthesis of Li-based fluorophosphates electrodes

Recham, N. and Chotard, J-N. and Jumas, J-C. and Laffont-Dantras, Lydia and Armand, M. and Tarascon, Jean-Marie Ionothermal synthesis of Li-based fluorophosphates electrodes. (2010) Chemistry of Materials, vol. 22 (n° 3). pp. 1142-1148. ISSN 1520-5002

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Official URL: http://dx.doi.org/10.1021/cm9021497

Abstract

Fluoride-based materials have regained interest within the field of Li-ion batteries largely due to the advent of nanosizing which has transformed the insulating insertion compounds into attractive electrode materials. Herein we demonstrate the effectiveness of ionothermal synthesis in the preparation of nanometric LiFePO4F and LiTiPO4F phases with structures isotopic to tavorite LiFePO4(OH) at temperatures of only 260 C, while temperatures of 600-700 C are required to obtain coarse powders via the ceramic method. However, the redox-active phases, which are obtained in a high state of division, have lower redox voltages than LiFePO4 despite the presence of fluorine. Additionally, LiTiPO4F shows staircase charge/discharge profiles with Ti2/3þ and Ti3/4þ couples. Though quite unusual in lithium intercalation oxides, a hint of a Li-driven Fe3/4þ transition has been detected in LiFePO4F.

Item Type:Article
Additional Information:Thanks to American Chemical Society editor. The definitive version is available at http://portal.acs.org/ The original PDF of the article can be found at Chemistry of Materials website : http://pubs.acs.org/toc/cmatex/22/3
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Université de Picardie Jules Verne (FRANCE)
Other partners > Université de Montpellier 2 (FRANCE)
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Deposited By: Nihad Lahdifi

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