LAUSR

Niobium Oxide (Nb2O5) can form extensive series of ternary compounds with tungsten oxide (WO3) by means of solid-state reaction. Although many kinds of compounds such as WNb12O33, W3Nb14O44, W5Nb16O55 and W8Nb18O69 have been identified more than 60 years ago [1, 2], only recently, it has been found that W5Nb16O55 can intercalate large quantities of Li at a higher charge/discharge rate. This process occurs even when the size of the tungsten niobium oxides are in micrometer scale [3], which makes W5Nb16O55 oxide a promising material for application as electrodes in fast-charging devices and all-solidstate energy storage systems. However, literature lacks of deep structural investigations of these complex oxides and only provide very low spatial resolution information.