Titre : Design of Redox-Active pi-Conjugated Structures for Organic Batteries.
Endroit : Pavillon Roger-Gaudry, salle G-715 à 11 h
Hôte : Professeur Mickaël Dollé

La conférence sera prononcée (en français) par le professeur Philippe Poizot, de l'Institut des Matériaux Jean Rouxel à l'Université de Nantes (France).

Résumé : Li-ion batteries (LIBs) appear nowadays as flagship technology able to power an increasing range of applications starting from small portable electronic devices to advanced electric vehicles. Over the past two decades, the discoveries of new metal-based host structures coupled with substantial technical developments have considerably improved their electrochemical performance, particularly in terms of energy density. Nevertheless, to further promote electrochemical storage systems while limiting the demand on metal-based raw materials, one possible parallel research to inorganic-based batteries consists in developing organic electrode materials. Indeed, organic systems exhibit several advantages such as chemical structures composed of quite naturally abundant elements (e.g., C, H, N or O) and a great richness in terms of chemical designs. For a long time, this class of redox-active materials has been disregarded mainly due to stability issues but, in recent years, progress has been made demonstrating that organics undeniably exhibit considerable assets. Great achievements have already been realized especially with organic radical batteries (ORBs). However, simultaneously achieving high energy/power density and high cyclability in a fully integrated organic Li-ion cell is still challenging. For the past few years, our group has been revisiting selected organic structures containing pi-conjugated enolate/C=O-based moieties in order to identify robust organic electrode structures reacting at both high and low potentials vs. Li. This contribution will be an opportunity to present some interesting organic materials showing reversible electrochemical activities at the solid state as well as recent advances in terms of poorly soluble organic cathode materials capable of being reversibly charged at a high enough potential.

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