New anode materials of Li_1+xV_1-xO₂ (0 ≤ x ≤ 0.1) for secondary lithium batteries: Correlation between structures and properties

Li_1+xV_1-xO₂ (0 ≤ x ≤ 0.1) compounds were studied as the anode materials for a lithium-ion battery. The crystal and electronic structures of the prepared materials were correlated with electrical conductivities and electrochemical properties. The electrochemical behaviors were significantly dependent on the composition of Li_1+xV _1-xO₂, and these were resulted from the perturbation of the local electronic structure arising from the increase in lithium contents in Li_1+xV_1-xO₂ rather than from the slight distortion in the crystal structure. The electrical conductivities of Li _1+xV_1-xO₂ increased with the increase in lithium contents in the compounds. Li_1.1V_0.9O₂ and Li_1.075V_0.925O₂ samples exhibit the first discharge capacities of 250 and 241 mAh g_-1 at 0.2 C-rate, respectively.