MARINO, Cyril; SOUGRATI, Moulay Tahar; PÖTTGEN, Rainer; GERKE, B.; HUO, Hua; MÉNÉTRIER, Michel; GREY, Clare P.; MONCONDUIT, Laure

doi:10.1021/cm303086j

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MARINO, Cyril
Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM ICMMM]

SOUGRATI, Moulay Tahar
Laboratoire des Agrégats Moléculaires et Matériaux Inorganiques [LAMMI]

PÖTTGEN, Rainer
Institut für Anorganische und Analytische Chemie

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Article de revue

Ce document a été publié dans

Chemistry of Materials. 2012-11-27, vol. 24, n° 24, p. 4735-4743

American Chemical Society

Résumé en anglais

The lithium-ion battery electrode material TiSnSb shows excellent electrochemical performance related to its high capacity (550 mA h g−1) and rate capability over 210 cycles. To discriminate between the role of active material and the role of the electrode formulation in the good electrochemical features of the TiSnSb electrodes, a full study comparing the electrochemical mechanisms of TiSnSb and a Ti/ Sn/Sb composite vs Li is undertaken by combining X-ray diffraction (XRD), 121Sb, 119Sn Mössbauer and 7Li NMR spectroscopic in situ measurements. During the first discharge, TiSnSb undergoes a direct conversion reaction while Ti/Sn/Sb composites proceed by a stepwise alloying process, both leading to a mixture of lithium antimonide, lithium stannides, and titanium. More surprisingly the charge occurs differently with a reformation of the "TiSnSb" phase in the first case and the formation of Sn and Sb in the second case. The key role of the interfaces in conversion type reactions is discussed. The nature of the interfaces is linked to the long-range order of elements in the starting material. Furthermore, the length scales of the interfaces between Li3Sb, LixSn and Ti appear to control the reactions that occur on charge.< Réduire

Mots clés en anglais

TiSnSb

in situ Mössbauer spectroscopy and XRD

Li-ion batteries

conversion

interfaces

DOI

http://dx.doi.org/10.1021/cm303086j

Projet Européen

Advanced lithium energy storage systems based on the use of nano-powders and nano-composite electrodes/electrolytes (ALISTORE)

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026