On "really" stoichiometric LiCoO2
Langue
en
Article de revue
Ce document a été publié dans
Electrochemical and Solid-State Letters. 2008, vol. 11, n° 11, p. A179-A182
Electrochemical Society
Résumé en anglais
The 7Li NMR T1 spin-lattice relaxation time is shown to be a very stringent criterion for determining the stoichiometry of LiCoO2. When Co3O4 containing a minimum impurity level of paramagnetic ions such as Fe or Ni is ...Lire la suite >
The 7Li NMR T1 spin-lattice relaxation time is shown to be a very stringent criterion for determining the stoichiometry of LiCoO2. When Co3O4 containing a minimum impurity level of paramagnetic ions such as Fe or Ni is used as the starting material (together with Li2CO3), a T1 value as long as 18 s is obtained, but this requires a rather long thermal treatment for complete elimination of excess Li. Such highly stoichiometric Li1CoO2 exhibits a very early insulator to metal transition upon Li deintercalation. Magnetic susceptibility and specific heat capacity investigations show the exclusive presence of diamagnetic low-spin (LS) Co3+.< Réduire
Mots clés en anglais
Inorganic compounds
Electrochemistry
Stoichiometric
LiCoO2
Origine
Importé de halUnités de recherche