Functional oxides for energy efficiency : combinatory synthesis and nanostructuration

Oxides are easy to fabricate, low cost, health and environmental friendly and stable in a large range of temperatures. They have a variety of magnetic, mechanic and electric properties which make them essential materials in many fields related to energy efficiency. These properties, often resulting from multiple interactions in competition, vary rapidly according to the composition and their dimensionality (crystals, thin films, massive ceramics, nanopowders, nanowires ...). They also depend on the intrinsic interfaces of materials (grain boundaries ...) or artificial interfaces (composite materials, multilayers). In addition, functionality and performance depend on the micro and / or nanostructure (porosity, exchange surface and stress response).

GREMAN has adopted a multi-scale material approach that addresses issues from the fundamental to the application. The properties targeted by the oxide materials and devices integrating them, concern three aspects of energy efficiency: 

• Energy harvesting by thermoelectric or piezoelectric effect.
• Energy storage (micro-batteries Li or Na with nano-structured electrodes, power capacities with materials with high dielectric permittivity).
• Reducing the energy consumption using materials with adjustable permittivity, permeability or emissivity.

Projects

Core-Shell" structure materials for multilayer ceramic capacitors with a high capacitance
Région Centre-Val de Loire project (2014-2017).
Coordinator: GREMAN (C. Autret).
Partners: Laboratoire GREMAN, SRT Microcéramique (Vendôme).

K, Na NiObates dopés pour de nouveaux PiEzoElectriques
Région Centre-Val de Loire project (2014-2017).
Coordinator: GREMAN (I. Monot-Laffez).
Partners: Laboratoire GREMAN, LSPM paris 13, ISTO université Orléans, Vermon.

Mécanisme de vieillissement et dégradation des céramiques dans les piles électrochimiques (2015-2016)
Région Centre-Val de Loire/CEA project.
Coordinator: GREMAN (C Autret).
Partners: GREMAN, CEA Le Ripault.

Sodium Ion Batteries : EneRgy for the Strategy of Innovation in the cenTer rEgion
Région Centre-Val de Loire project (2016-2019).
Coordinator: CEA Le Ripault, Société VLAD (Tours).
Partners: Laboratoire GREMAN, Laboratoire PCM2E (université de Tours).

Supercondensateurs de haute énergie à base d’oxydes nanotexturés
Région Centre-Val de Loire project (2014-2016).
Coordinator: CEHMTI, Université d’Orléans.
Partners: laboratoire GREMAN, laboratoire CEMHTI (université d’Orléans), CEA Le Ripault.

INTerfaces in thin fiIMs - Capacitors 2015 -
Région Centre-Val de Loire project (2012-2016).
Coordinator: GREMAN (A Ruyter).
Partners: Laboratoire ICMN (université d’Orléans / CNRS).

MicrogEnérateur ThermoElectrique à base d’Oxydes
Région Centre-Val de Loire project (2015-2018).
Coordinator: GREMI.
Partners: Laboratoire GREMI (université d’Orléans / CNRS), Laboratoire GREMAN, Laboratoire CRISMAT (Université de Caen), ST Microelectronics.

Acquisition d’un équipement de frittage par Spark Plasma Sintering (SPS) pour l’activité de nombreux projets du laboratoire GREMAN et des laboratoires matériaux Orléans-Tours (2015-2017).
FEDER/CPER Région Centre Val de Loire project
Coordinator: GREMAN (I. Monot-Laffez).

Dépôt d'oxyde par voie polymérique sur substrat structuré 3D
Région Centre-Val de Loire/CEA project - LAVOISIER (2015-2016).
Project's leader: GREMAN (N. Poirot).
Partners: Laboratoire GREMAN, Laboratoire PCM2E (université de Tours) CEA Le Ripault.