Structural Construction of WO₃ Nanorods as Anode Materials for Lithium-Ion Batteries to Improve Their Electrochemical...

WO₃ nanobundles and nanorods were prepared using a facile hydrothermal method. The X-ray diffraction pattern confirms that the obtained samples are pure hexagonal WO₃. Transmission electron microscope images detected the gap between the different nanowires that made up the nanobundles and nanorods. As the anode materials of lithium-ion batteries, the formed WO₃ nanobundles and WO₃ nanorods deliver an initial discharge capacity of 883.5 and 971.6 mA h g^-1, respectively. Both WO₃ nanostructures deliver excellent capacity retention upon extended cycling. At a current density of 500 mA g^-1, the reversible capacities of WO₃ nanobundle and WO₃ nanorod electrodes are 444.0 and 472.3 mA h g^-1, respectively, after 60 cycles.