Vanadium pentoxide/polypyrrole aerogel (ARG) composites were synthesized by sol-gel routes, and investigated as cathode materials in Li batteries. The primaly method utilized simultaneous polymerization of pyrrole and vanadium alkoxide precursors. Supercritical drying yielded high surface (150-257 sq m/g) aerogels with densities between 0.1 and 0.2 g/cc. The interaction between the polypyrrole (PPy) and V2O5 aerogel in the nanocomposites was probed using IR spectroscopy. Our results suggest that the inorganic and ...
The fine colloid size, high surface area and controllable density of vanadium oxide 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 ...
Vanadium pentoxide/polypyrrole aerogel (ARG) nanocomposites were prepared by hydrolysis of VO(OC3H7)3 using pyrrole/water/acetone mixtures. Monolithic green-black gels with polypyrrole/V ratios ranging from 0.15 to 1.0 resulted from simultaneous polymerization of the pyrrole and vanadium alkoxide precursors. Supercritical drying yielded high surface (150-200 sq meters/g) aerogels, of sufficient mechanical integrity to allow them to be cut without fracturing. TEM studies of the aerogels show that they are comprised of fibers similar ...
Vanadium pentoxide (V2O5) aerogels were prepared by supercritical drying of a vanadyl alkoxide precursor. Thin films prepared from the aerogel were found to intercalate up to 1.9 moles of Li per mole of aerogel with good cycling reversibility. jg p.3
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