Single crystal nanobelts of V{sub}3O{sub}7·H{sub}2O: A lithium intercalation host with a large capacity

摘要

In this study, single crystal V{sub}3O{sub}7·H{sub}2O nanobelts were successfully synthesized using a simple hydrother-mal route, in which templates or catalysts were absent. The synthesized V{sub}3O{sub}7·H{sub}2O nanobelts are highly crystalline and have lengths up to several tens of micrometers. The width and thickness of the nanobelts are found to be about 30-50 and 30 nm, respectively. A lithium battery using V{sub}3O{sub}7·H{sub}2O nanobelts as the positive electrode exhibits a high initial discharge capacity of 409 mAh g{sup}(-1), corresponding to the formation of Li{sub}xV{sub}3O{sub}7·H{sub}2O (x = 4.32). Such a high degree of electrochemical performance is attributed to the intrinsic properties of the single-crystalline V3O7H2O nanobelts.