High substitution rate in TiO2 anatase nanoparticles with cationic vacancies for fast lithium storage
SALANNE, Mathieu
PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX [PHENIX]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX [PHENIX]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
DUTTINE, Mathieu
PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX [PHENIX]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
< Réduire
PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX [PHENIX]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Langue
en
Article de revue
Ce document a été publié dans
Chemistry of Materials. 2015, vol. 27, n° 14, p. 5014-5019
American Chemical Society
Résumé en anglais
Doping is generally used to tune and enhance the properties of metal oxides. However, their chemical composition cannot be readily modified beyond low dopant amounts without disrupting the crystalline atomic structure. In ...Lire la suite >
Doping is generally used to tune and enhance the properties of metal oxides. However, their chemical composition cannot be readily modified beyond low dopant amounts without disrupting the crystalline atomic structure. In the case of anatase TiO2, we introduce a new solution-based chemical route allowing the composition to be significantly modified, substituting the divalent O2– anions by monovalent F– and OH– anions resulting in the formation of cationic Ti4+ vacancies (□) whose concentration can be controlled by the reaction temperature. The resulting polyanionic anatase has the general composition Ti1–x–y□x+yO2–4(x+y)F4x(OH)4y, reaching vacancy concentrations of up to 22%, i.e., Ti0.78□0.22O1.12F0.4(OH)0.48. Solid-state 19F NMR spectroscopy reveals that fluoride ions can accommodate up to three different environments, depending on Ti and vacancies (i.e. Ti3-F, Ti2□1-F, and Ti1□2-F), with a preferential location close to vacancies. DFT calculations further confirm the fluoride/vacancy ordering. When its characteristics were evaluated as an electrode for reversible Li-ion storage, the material shows a modified lithium reaction mechanism, which has been rationalized by the occurrence of cationic vacancies acting as additional lithium hosting sites within the anatase framework. Finally, the material shows a fast discharging/charging behavior, compared to TiO2, highlighting the benefits of the structural modifications and paving the way for the design of advanced electrode materials, based on a defect mediated mechanism.< Réduire
Mots clés en anglais
Oxides
Defects in solids
Anions
Minerals
Lithium
Origine
Importé de halUnités de recherche