courbe en fond

Former staff and alumni

Main Research Activities

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 (128 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.

Academic Training

- 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.

Professional skills

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

Running Projects

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

First 18650-format Na-ion cells aging investigation: A degradation mechanism study

L.H.B. Nguyen, P. Sanz Camacho, J. Fondard, D. Carlier, L. Croguennec, M.R. Palacin, A. Ponrouch, C. Courrèges, R. Dedryvère, K. Trad, C. Jordy, S. Genies, Y. Reynier, L. Simonin

Journal of Power Sources, 2022

Ionothermal Synthesis of Polyanionic Electrode Material Na 3V2(PO4)2FO2 through a Topotactic Reaction

Jacob Olchowka, Long H. B. Nguyen, Emmanuel Petit, Paula Sanz Camacho, Christian Masquelier, Dany Carlier, Laurence Croguennec

Inorganic Chemistry, 2020

A Combined Operando Synchrotron X-ray Absorption Spectroscopy and First-Principles Density Functional Theory Study to Unravel the Vanadium Redox Paradox in the Na3V2(PO4)2F3–Na3V2(PO4)2FO2 Compositions

Long H. B. Nguyen, Antonella Iadecola, Stéphanie Belin, Jacob Olchowka, Christian Masquelier, Dany Carlier, and Laurence Croguennec

The Journal of Physical Chemistry C, 2020

Aluminum substitution for vanadium in the Na3V2(PO4)2F3 and Na3V2(PO4)2FO2 type materials

Jacob Olchowka, Long H. B. Nguyen, Thibault Broux, Paula Sanz Camacho, Emmanuel Petit, François Fauth, Dany Carlier, Christian Masquelier, Laurence Croguennec

Chemical Communications, 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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