On "really" stoichiometric LiCoO2

Michel Ménétrier (1) , Dany Carlier-Larregaray (1) , Maxime Blangero (1) , Claude Delmas (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

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+.

Mots clés: Inorganic compounds; Electrochemistry; Stoichiometric; LiCoO2

Domaines: Matériaux

Michel Ménétrier, Dany Carlier-Larregaray, Maxime Blangero, Claude Delmas. On "really" stoichiometric LiCoO2. Electrochemical and Solid-State Letters, 2008, 11 (11), pp.A179-A182. ⟨10.1149/1.2968953⟩. ⟨hal-00324042⟩