Transformation of delithiated LiVO 2 to the spinel structure

Abstract

Heat-treatment of Li 0.5VO 2 obtained by chemical extraction of lithium from the layered LiVO 2 structure results in the spinel Li[V 2]O 4. Similar treatment of Li 0.45VO 2 results in a cation-deficient spinel Li 0.9V 0.1[V 1.9◊ 0.1]O 4 with vacancies on the octahedral B-sites of the spinel structure. Differential scanning calorimetric and powder X-ray diffraction data show that Li 0.45VO 2 transforms irreversibly to spinel at ∼ 300 °C and that this phase is stable to ∼ 420 °C.