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Room-temperature single-phase Li insertion/extraction in nanoscale LixFePO4

Gibot, Pierre and Casas-Cabanas, Montse and Laffont-Dantras, Lydia and Levasseur, Stéphane and Carlach, Philippe and Hamelet, Stéphane and Tarascon, Jean-Marie and Masquelier, Christian Room-temperature single-phase Li insertion/extraction in nanoscale LixFePO4. (2008) Nature Materials, 7. 741-747. ISSN 1476-1122

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Official URL: http://dx.doi.org/10.1038/nmat2245


Classical electrodes for Li-ion technology operate by either single-phase or two-phase Li insertion/de-insertion processes, with single-phase mechanisms presenting some intrinsic advantages with respect to various storage applications. We report the feasibility to drive the well-established two-phase room-temperature insertion process in LiFePO4 electrodes into a single-phase one by modifying the material's particle size and ion ordering. Electrodes made of LiFePO4 nanoparticles (40 nm) formed by a low-temperature precipitation process exhibit sloping voltage charge/discharge curves, characteristic of a single-phase behaviour. The presence of defects and cation vacancies, as deduced by chemical/physical analytical techniques, is crucial in accounting for our results. Whereas the interdependency of particle size, composition and structure complicate the theorists' attempts to model phase stability in nanoscale materials, it provides new opportunities for chemists and electrochemists because numerous electrode materials could exhibit a similar behaviour at the nanoscale once their syntheses have been correctly worked out.

Item Type:Article
Additional Information:Thanks to Nature Publishing Group editor. The definitive version is available at http://www.nature.com The original PDF of the article can be found at Nature Materials website : http://www.nature.com/nmat/index.html
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Umicore (BELGIUM)
Other partners > Université de Picardie Jules Verne (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Laboratory name:
Deposited On:16 Jun 2009 06:59

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