Abstract
Amorphous LiNiVO 4 has been synthesized by a new `chimie douce' method, which consists of a precipitation reaction occurring at a well-defined pH. This new amorphous lithiated vanadate was shown, by means of thermal analyses and X-ray powder diffraction, to progressively crystallize in the spinel-type structure upon increasing the annealing temperature from 200°C to 700°C. Both amorphous and crystallized LiNiVO 4 can reversibly react with 7 Li per formula unit, similar to the compounds synthesized by the classical high temperature route. To understand the chemical transformations occurring during the Li uptake/removal in crystallized LiNiVO 4, and thereby to throw some light on the origin of the large capacity of those materials, in-situ XRD measurements have been performed.
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