Non-cooperative Jahn-Teller effect in LiNiO2: An EXAFS study
1995; Elsevier BV; Volume: 94; Issue: 2 Linguagem: Inglês
10.1016/0038-1098(95)00020-8
ISSN1879-2766
AutoresAline Rougier, Claude Delmas, A. V. Chadwick,
Tópico(s)Crystal Structures and Properties
ResumoLithium nickel oxide, used as positive electrode in rechargeable lithium batteries, exhibits a layered structure made of NiO2 slabs between which Li+ ions are inserted in an octahedral environment. In fact, stoichiometric LiNiO2 has never been reported, the true formula is Li1−zNi1+zO2 (0.0<z≤0.20). z depending on the experimental conditions. Special attention devoted to the synthesis conditions, has allowed us to obtain quasi-2D LiNiO2. EXAFS spectroscopy shows clearly the existence of two different NiO bond lengths: at 1.91 Å (for four of them) and 2.09 Å for the two last ones. This local distortion of the NiO6 octahedra results from the Jahn-Teller effect of the trivalent nickel ion in the low spin state t26e1.
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