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J. Phys. Chem. C 2009, 113, 15058–15067
Novel Flowerlike Metastable Vanadium Dioxide (B) Micronanostructures: Facile Synthesis and Application in Aqueous Lithium Ion Batteries Shudong Zhang, Yingmei Li, Changzheng Wu, Fei Zheng, and Yi Xie* Department of Nanomaterials and Nanochemistry, Hefei National Laboratory for Physical Sciences at Microscale, UniVersity of Science and Technology of China, Hefei, Anhui 230026, P.R. China ReceiVed: April 9, 2009; ReVised Manuscript ReceiVed: July 6, 2009
Novel flowerlike VO2 (B) micro-nanostructures assembled by single-crystalline nanosheets have been successfully synthesized via a hydrothermal route using polymer polyvinyl pyrrolidone (PVP, K30) as capping reagent. Detailed proofs indicated that the process of crystal growth was dominated by a nucleation and growth, self-assembly, and then Ostwald ripening growth mechanism. For the first time, the flowerlike micronanostructures VO2 (B) was applied as the active material into aqueous lithium ion battery applications, which showed improved electrochemical properties with the first discharge capacity reaching 74.9 mAhg-1, a quite outstanding value for aqueous lithium ion battery systems in light of previous reports (usually
