Preparation and electrochemical characterization of size controlled SnO2-RuO2 composite powder for monolithic hybrid battery

Tin oxide (SnO2) powders with a particle size of ~20 nm were synthesized by a gas condensation method. Ruthenium oxide was loaded by an incipient-wetness method, in which an aqueous solution of RuC13 was added to the manufactured SnO2 powder in an amount that was just sufficient to wet completely the powder. And then, the resulting solution was obtained after freeze-drying to synthesis the smallest particle. The as-synthesized SnO2 powder with 1.5 wt.% ruthenium oxide (RuO2) exhibited well-developed facets and had a very uniform particle size. The first discharge capacity was lower than comparing to commercial powder because of forming the second phase, but showed good cyclability. A maximum specific electrode capacitance of 20 F/g and a maximum specific power of X80 W/kg were achieved by manufactured SnO2 with 1.5 wt.% RuO2. This result indicated that the synthesized SnO2-RuO2 composite powder of nano-size scale is candidate for use in fabricating monolithic hybrid batteries using suitable electrolyte as well.