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Descriptif des activités de recherche

Na-ion batteries (NIBs) have recently been developed as an alternate for future sustainable energy storage system in place of the conventional Li-ion batteries (LIBs). Among those which have lately been studied as positive electrode materials for NIBs, Na3V2(PO4)2F3 (NVPF) is the most promising one due to its highly stable poly-anionic framework, and its high theoretical energy density of 507 Wh.kg-1 (128 Ah.kg-1 at an average potential of 3.95 V vs. Na+/Na). Despite the presence of three Na+ per formula unit, only two of which are electroactive. The aim of this PhD work is to enhance the performance and the capacity of the NVPF-structured materials through the extraction of the third Na+ by a cationic / anionic substitution in the host structure. The crystal structure of the obtained materials will be elucidated by a combination of capillary powder X-ray diffraction, neutron diffraction and synchrotron diffraction techniques. Furthermore, the changes in the local environment of the interest ions will be detected by the use of solid-state NMR, which is done in collaboration with Dr. Dany CARLIER (ICMCB, Bordeaux), infrared and X-ray absorption technique. Finally, the electrochemical testing will help to confirm the improvement in the electrochemical performance of the substituted compounds.

Parcours

- PhD (on-going / 2016 – 2019): Dr. Laurence CROGUENNEC (ICMCB, Bordeaux) and Prof. Christian MASQUELIER (LRCS, Amiens).

New poly-anionic materials for positive electrode in Na-ion batteries.

- Erasmus Mundus M.E.S.C Master (Materials for Energy Storage and Conversion), 2014 – 2016.

S1: Aix-Marseille Université (FR), S2: Warsaw University of Technology (PL), S3: Université de Picardie Jules Verne (FR).

Master thesis: Synthesis and solid-state NMR characterisation of NASICON-structured materials applied in all solid-state Li/Na-ion batteries (University of Cambridge, UK). Supervised by: Dr. Oliver PECHER, Dr. Maria TSIAMTSOURI, and Prof. Clare P. GREY.


Compétences

Solid-state synthesis, sol-gel synthesis, solid-state NMR characterisation, powder X-ray diffraction and structural refinement, electrochemical testing. 

Projets en cours

This PhD project is funded by the French research network on electrochemical energy storage (RS2E), 2016 – 2019.


Stability in water and electrochemical properties of the Na3V2(PO4)2F3 – Na3(VO)2(PO4)2F solid solution

Long H.B.Nguyen, Thibault Broux, Paula Sanz Camacho, Dominique Denux, Lydie Bourgeois, Stéphanie Belin, Antonella Iadecola, François Fauth, Dany Carlier, Jacob Olchowka, Christian Masquelier, Laurence Croguennec

Energy Storage Materials, 2019

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