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Badot, J.-C., Lestriez, B. & Dubrunfaut, O. (2016) Interest in broadband dielectric spectroscopy to study the electronic transport in materials for lithium batteries. Mater. Sci. Eng. B-Adv. Funct. Solid-State Mater. 213 190–198.
Added by: Richard Baschera (2016-12-14 14:48:52) Last edited by: Richard Baschera (2016-12-14 16:00:25) |
| Type de référence: Article DOI: 10.1016/j.mseb.2016.05.012 Numéro d'identification (ISBN etc.): 0921-5107 Clé BibTeX: Badot2016 Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: carbon-lifepo4 nanocomposites, composite electrodes, Dielectric spectroscopy, Electronic conductivity, hz, interfaces, Lithium batteries, multiscale, Multiscale conductivity and permittivity Créateurs: Badot, Dubrunfaut, Lestriez Collection: Mater. Sci. Eng. B-Adv. Funct. Solid-State Mater. |
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| Résumé |
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Broadband dielectric spectroscopy (BDS) is used to measure complex permittivity and conductivity of conducting materials for lithium batteries at frequencies from a few Hz to several GHz with network and impedance analysers. Under the influence of an electric field, there will be charge density fluctuations in the conductor mainly due to electronic transfer. These fluctuations result in dielectric relaxations for frequencies below 100 GHz. The materials are compacted powders in which each. element (particles, agglomerates of particles) can have different sizes and morphologies. In the present review, studies are reported on the influence of surface states in LiNiO2 (ageing and degradation in air) and LiFePO4 (carbon coating thin layer), and on a composite electrode based on the lithium trivanadate (Li1.1V3O8) active material. The results have shown that the BDS technique is very sensitive to the different scales of materials architectures involved in electronic transport, from interatomic distances to macroscopic sizes. (C) 2016 Elsevier B.V. All rights reserved.
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