TARHOUCHI, Ilyas; VINATIER, Philippe; MÉNÉTRIER, Michel; VIALLET, Virginie

doi:10.1016/j.ssi.2016.08.016

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TARHOUCHI, Ilyas
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]

VINATIER, Philippe
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

MÉNÉTRIER, Michel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

Langue

Article de revue

Ce document a été publié dans

Solid State Ionics. 2016, vol. 296, p. 18–25

Elsevier

Résumé en anglais

Li10SnP2S12, the tin analogue of the Li10GeP2S12 superionic conductor is characterized. Rietveld refinement of capillary powder XRD confirms that the material provided by NEI Corp. is mainly composed of Li10SnP2S12 with LGPS structure, with some Li2SnS3 impurity. Very strong reactivity at low voltage and vs. Li metal is shown by impedance measurements using Au and Li electrodes, as well as 3-electrode cyclic voltammetry. Galvanostatic measurements in half-cells with liquid and solid electrolytes confirm that Li10SnP2S12 reacts with respectively 16 and 8 lithium per mole of tin below 0.5 V vs. Li+/Li, most probably following a conversion/alloying reaction. Making use of this reactivity, we tested the concept of a LiCoO2/Li10SnP2S12 cell, were the electrolyte also acts as negative electrode at the contact with the negative current collector. 0.5 Li can be deintercalated from such cells, with very poor reversibility as probably hampered by the conversion/alloying reaction in the solid state, at least with a non-optimized electrode formulation. Although the voltage slowly but strongly relaxes when opening the circuit suggesting propagation of the reaction from the negative electrode to the electrolyte, it does not seem to reach the positive since no short-circuit was observed.< Réduire

Mots clés en anglais

LGPS structure

Sulfide

Solid electrolyte

Electrochemical properties

Conversion reaction

DOI

http://dx.doi.org/10.1016/j.ssi.2016.08.016

Project ANR

Laboratory of excellency for electrochemical energy storage - ANR-10-LABX-0076

Origine

Importé de hal

Unités de recherche

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