Structural and transport evolution in the ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
Structural and transport evolution in the LixAg2V4O11 system
Auteur(s) :
Sauvage, F. [Auteur]
Northwestern University [Evanston]
Bodenez, V. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 [LRCS]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Morcrette, M. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 [LRCS]
Tarascon, J.-M. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 [LRCS]
Poeppelmeier, K.R. [Auteur]
Northwestern University [Evanston]
Northwestern University [Evanston]
Bodenez, V. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 [LRCS]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Morcrette, M. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 [LRCS]
Tarascon, J.-M. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 [LRCS]
Poeppelmeier, K.R. [Auteur]
Northwestern University [Evanston]
Titre de la revue :
Journal of Power Sources
Nom court de la revue :
Journal of Power Sources
Numéro :
195
Pagination :
1195-1201
Éditeur :
Elsevier BV
Date de publication :
2010-02-15
Statut de l’article :
Publié
ISSN :
0378-7753
Mot(s)-clé(s) en anglais :
Primary lithium batteries
ICD
Cathode
SVO
Ag2V4O11
In situ XRD measurements
ICD
Cathode
SVO
Ag2V4O11
In situ XRD measurements
Discipline(s) HAL :
Chimie/Chimie théorique et/ou physique
Résumé en anglais : [en]
We investigated the effect of inserting lithium into Ag2V4O11 (ɛ-SVO) on the structure, electronic properties and redox committed by combining in situ XRD measurements, ESR spectroscopy and 4 probes DC conductivity coupled ...
Lire la suite >We investigated the effect of inserting lithium into Ag2V4O11 (ɛ-SVO) on the structure, electronic properties and redox committed by combining in situ XRD measurements, ESR spectroscopy and 4 probes DC conductivity coupled with thermopower measurements. The electrochemical discharge occurs in three consecutive steps above 2 V (vs. Li+/Li). The first one, between 0 < x < ∼0.7 in Lix-SVO, has been ascribed to the V5+ reduction through a solid solution mechanism. This reduction competes with a Li+/Ag+ displacement reaction which leads to a structural collapse owing to the ionic radii mismatch between the withdrawn Ag+ and the inserted Li+. The silver reduction progresses continuously with two different slopes along two composition–potential plateaus at 2.81 V and 2.55 V. Finally, the reduction continues until we obtain an amorphous structure with V4+ and a ɛ of V3+. Although, the silver re-enters the structure during the subsequent recharge, the original structure is not recovered. The reduction of silver forming silver metal nano-clusters acts to increase the electronic conductivity from 3.8 × 10−5 S cm−1 to 1.4 × 10−3 S cm−1. In complement to this study, we also report on a low temperature hydro-(solvo)-thermal approach using HF(aq) as a mineralizer, which enables the synthesis of nano-sized ɛ-SVO particles that exhibit superior electrochemical performances compared to conventional particles synthesized by solid-state reaction.Lire moins >
Lire la suite >We investigated the effect of inserting lithium into Ag2V4O11 (ɛ-SVO) on the structure, electronic properties and redox committed by combining in situ XRD measurements, ESR spectroscopy and 4 probes DC conductivity coupled with thermopower measurements. The electrochemical discharge occurs in three consecutive steps above 2 V (vs. Li+/Li). The first one, between 0 < x < ∼0.7 in Lix-SVO, has been ascribed to the V5+ reduction through a solid solution mechanism. This reduction competes with a Li+/Ag+ displacement reaction which leads to a structural collapse owing to the ionic radii mismatch between the withdrawn Ag+ and the inserted Li+. The silver reduction progresses continuously with two different slopes along two composition–potential plateaus at 2.81 V and 2.55 V. Finally, the reduction continues until we obtain an amorphous structure with V4+ and a ɛ of V3+. Although, the silver re-enters the structure during the subsequent recharge, the original structure is not recovered. The reduction of silver forming silver metal nano-clusters acts to increase the electronic conductivity from 3.8 × 10−5 S cm−1 to 1.4 × 10−3 S cm−1. In complement to this study, we also report on a low temperature hydro-(solvo)-thermal approach using HF(aq) as a mineralizer, which enables the synthesis of nano-sized ɛ-SVO particles that exhibit superior electrochemical performances compared to conventional particles synthesized by solid-state reaction.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
CNRS
CNRS
Collections :
Date de dépôt :
2021-06-18T08:28:26Z
2021-10-08T11:46:23Z
2021-10-08T11:46:23Z