Reference : NbVO5 Mesoporous Thin Films by Evaporation Induced Micelles Packing: Pore Size Depend...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/100344
NbVO5 Mesoporous Thin Films by Evaporation Induced Micelles Packing: Pore Size Dependence of the Mechanical Stability upon Thermal Treatment and Li Insertion/Extraction
English
Krins, Natacha mailto [Université de Liège - ULg > Département de chimie (sciences) > LCIS - GreenMAT]
Bass, John D [Universite Pierre et Marie Curie (Paris 6), College de France > Chimie de la Matière Condensée de Paris, UMR UPMC-CNRS 7574 > > >]
Grosso, David [Universite Pierre et Marie Curie (Paris 6), College de France > Chimie de la Matière Condensée de Paris, UMR UPMC-CNRS 7574 > > > >]
Henrist, Catherine [Université de Liège - ULg > Département de chimie (sciences) > LCIS - GreenMAT]
Delaigle, Romain [Université Catholique de Louvain - UCL > Institute of Condensed Matter and Nanosciences, Division Molecules Solids and Reactivity > > >]
Gaigneaux, Eric M [Université Catholique de Louvain - UCL > Institute of Condensed Matter and Nanosciences, Division Molecules Solids and Reactivity > > >]
Cloots, Rudi [Université de Liège - ULg > Département de chimie (sciences) > LCIS - GreenMAT]
Vertruyen, Bénédicte mailto [Université de Liège - ULg > Département de Chimie > LCIS-GreenMat > >]
Sanchez, Clement [Universite Pierre et Marie Curie (Paris 6), College de France > Chimie de la Matière Condensée de Paris, UMR UPMC-CNRS 7574 > > >]
2011
Chemistry Of Materials
23
18
4124-4131
Yes (verified by ORBi)
International
0897-4756
[en] Mesoporous thin films (MTFs) appear as an interesting architecture for positive electrodes in Li-ion energy storage systems because they offer high specific area and interconnected porosity presenting homogeneous pore size and wall thickness. However, it must be ascertained that the mesostructure survives template removal or/and crystallization and is retained on electrochemical cycling. In order to investigate the potentialities and limits of the soft-templating approach in the case of complex transition metal oxide networks, we deliberately selected a "difficult" compound: NbVO5 was chosen because it combines a challenging synthesis with reported severe structural distortions during the first lithium insertion in the bulk material. In this work, NbVO5 MTFs with different pore sizes were synthesized using the evaporation induced micelles packing (EIMP) method. PS-b-PEO diblock copolymers of different molar weights were used as structure directing agent in order to obtain wormlike porous networks with pore size and wall thickness ranging from 15 to 100 nm. Thermal ellipsometry analysis, used to track surfactant removal and crystallization of the layer, reveals that partial crystallization is possible while retaining the mesoporous architecture. Electron tomography complements result from environmental ellipsometric porosimetry, atomic force microscopy, and transmission electron microscopy to provide a comprehensive description of the structure. A multilayer process is also proposed to build crack-free thick mesoporous films. The mechanical stability of MTFs presenting three different pore sizes is tested by inserting Li(+) in amorphous NbVO5 MTFs using cyclic voltammetry. Capacity retention data show that the mechanical stresses associated with Li+ insertion are better accommodated by MTFs compared to nonporous films, and this ability is enhanced as the pore size decreases.
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
IAP Inanomat P6/17 (Belspo)
http://hdl.handle.net/2268/100344
10.1021/cm103481n

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