Ionic-electronic conductors based on lithium-containing oxide bronzes

Lithium-containing oxide bronzes Li_xV_2?yM_yO₅-β (M=Mo or W) have been studied in wide range of temperature (25–550°C) and composition (0.22?x?0.47, 0?y?0.25) as prospective ionic-electronic conductors. By coulometric titration tecknique, $\text{Δ}\text{G}{}_{\mathrm{<mtext>Li</mtext>}}$, $\text{Δ}\text{H}{}_{\mathrm{<mtext>Li</mtext>}}$ and $\text{Δ}\text{S}{}_{\mathrm{<mtext>Li</mtext>}}$ have been found and ordering of the lithium ions within the channel structure Li_xV₂O₅-β has been discussed depending on composition and temperature. The chemical diffusion coefficient for lithium D?_Li has been measured by potentiometric technique on hot-pressed ceramic samples. The lithium self-diffusion coefficient D_Li and partial lithium-ionic conductivity have been calculated.