Electrochemical Reactivity of Li2VOSiO4 toward Li

Prakash, A. S.; Rozier, P.; Dupont, L.; Vezin, Herve; Sauvage, F.; Tarascon, J.-M.

Document type :

Article dans une revue scientifique: Article original

DOI :

10.1021/cm051986k

Permalink :

http://hdl.handle.net/20.500.12210/39647

Title :

Electrochemical Reactivity of Li2VOSiO4 toward Li

Author(s) :

Prakash, A. S. [Auteur]
Rozier, P. [Auteur]
Dupont, L. [Auteur]
Vezin, Herve [Auteur]

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Sauvage, F. [Auteur]
Tarascon, J.-M. [Auteur]

Journal title :

Chemistry of Materials

Abbreviated title :

Chem. Mater.

Volume number :

Pages :

407-412

Publisher :

American Chemical Society (ACS)

Publication date :

2006-01

ISSN :

0897-4756

English keyword(s) :

Reactivity
Electrical conductivity
Lithium
Materials
Ions

HAL domain(s) :

Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]

English abstract : [en]

We report on the chemical/electrochemical reactivity of the insulating layered V-based silicate-phase Li2VOSiO4 toward Li. The silicate phase, made by a ceramic approach and consisting of 5−20 μm agglomerates, exhibits ...
Show more >We report on the chemical/electrochemical reactivity of the insulating layered V-based silicate-phase Li2VOSiO4 toward Li. The silicate phase, made by a ceramic approach and consisting of 5−20 μm agglomerates, exhibits only a slight reactivity with Li in chemical or electrochemical reactions. By ball milling Li2VOSiO4 in the presence of carbon, we succeeded in preparing composites that reversibly react with 0.7 Li+ per unit formula at an average voltage of 3.6 V vs Li+/Li0. This electrochemical reactivity was chemically mimicked using NO2BF4 or Br2 and LiI as oxidizing and reducing agents, respectively. Through a combination of X-rays and HRTEM measurements, we showed that the insertion−deinsertion mechanism is a two-phase process with poor kinetics. The delithiated phase crystallizes in space group P4 (a = 6.206 Å, c = 4.5715Å), whereas the precursor lithiated phase crystallizes in P4/nmm (a = 6.366(9) Å, c = 4.456(6) Å). Because silicates such as phosphates are cheap and can also be made redox-active by carbon coatings, they should not be overlooked as possible electrode candidates in future research.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Research team(s) :

Propriétés magnéto structurales des matériaux (PMSM)

Submission date :

2021-06-18T09:13:38Z
2021-06-24T10:15:00Z

Version	Link	Modification date
2	20.500.12210/39647*	2021-06-24T10:09:02Z
1	20.500.12210/39647.1	2021-06-18T09:13:38Z

Electrochemical Reactivity of Li2VOSiO4 toward Li

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Electrochemical Reactivity of Li2VOSiO4 toward Li

BibTeX

CSV

Excel

RIS