Synthesis and Properties of Vanadium Oxide Aerogel Films

摘要

The fine colloid size, high surface area and controllable density of vanadiumoxide aerogels make these materials interesting candidates for lithium insertion electrodes. Thin films of vanadium oxide aerogels were prepared using an alkoxide precursor sol and supercritical drying with CO2. Film preparation methods included spin coating of fine aerogel particles suspended in a solvent and dip coating of the precursor sol onto carbon paper substrates. The room temperature electrical conductivity of partially dehydrated materials (V2O5 0.5 H2O) varies from 10(exp -5) S/cm to 10(exp -4) S/cm depending upon the density of the final aerogel. Potential sweep measurements indicate that the films possess good insertion capacity (approx. 2 Li a per V2O5) and can be cycled reversibly. p1.