Laboratoire Charles Coulomb UMR 5221 CNRS/UM2 (L2C)

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Accueil > La Recherche > Axes & Equipes > Nanostructures & Spectroscopies > Equipe : Nanomatériaux > Thème : Nanomatériaux fonctionnels

Materials for Rechargeable Battery

par Sébastien LAYSSAC - publié le

  • Participants L2C : Laurent Alvarez, Jean-Louis Bantignies, Laure Gourrier , François
    Henn, Patrick Hermet, Thierry Michel et Matthieu Paillet
  • Contrats : ANR ANZAS (programme Stock-E) 2009-2011.
  • Partenaires industriels : SCPS, SAFT & Helion-AREVA

Our research activity is mainly focussed on nickel hydroxide ( ). This material has been
raising a considerable interest for decades since it is the active mass of the positive
electrode of many commercial rechargeable batteries, e.g. Ni/Cd, Ni/MH or Ni/Zn, and
hence is one of the essential compounds involved in electrochemical energy storage. It
has been known for a long time that its crystallographic state along with the density and
type of defects as well as its microscopic morphology play a key role on its
electrochemical properties and consequently on its capacity to store and deliver energy.
However, little is known about the elementary mechanism taking place during the redox
reaction. For instance, one does not know the exact conditions corresponding to the
detrimental semi-conductor/insulating transition that occurs upon reduction of toward .
Fundamental investigations are thus needed in order to get a better understanding of
electrochemical properties and hence, to propose practical solutions for improving its
performances.
Our research aims at getting insights about the elementary mechanism involved into
redox conversion by means of extended vibrational spectroscopy (Raman and IR) and
electrochemical measurements. In particular, we develop in-situ analysis of at the
micrometric scale coupling µ-Raman and potentiodynamic cycling. Besides, we also study
via DFT based molecular simulation which is so far the only tool for investigating the
compound at the atomic scale.

Recent Publications 2008-2011 :

  • New insights in the vibrational behaviour of nickel hydroxide and oxyhydroxide using Inelastic Neutron Scattering, Far/Mid-Infrared and Raman Spectroscopies.
  • J.L.Bantignies, S. Deabate, A. Righi, S. Rols, P. Hermet, J.L. Sauvajol & F. Henn , J. Phys. Chem. C 112 (2008) 2193-2201
  • "Structural modification and electrochemical behavior of the ß(II)-Ni(OH)2/ ß(III) -NiOOH redox couple under potentiodynamic cycling conditions" S. Deabate, F. Fourgeot and
    F. Henn, Electrochim. Acta, 51 (2006) 5430

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