Department of Nanomaterials and Nanochemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
Chemistry. 2011 Jan 3;17(1):384-91. doi: 10.1002/chem.201000691. Epub 2010 Oct 29.
New-phased metastable V(2) O(3) porous urchinlike micronanostructures were first fabricated on a large scale by a simple top-down strategy of pyrolyzing a vanadyl ethylene glycolated precursor in the absence of any templates or matrices. The pyrolysis mechanism was clearly revealed by synchrotron vacuum ultraviolet (VUV) photoionization mass spectra for the first time. The new-phased metastable V(2) O(3) exhibits a body-centered cubic bixbyite structure and shows structural evolution from metastable cubic symmetry to thermodynamically stable rhombohedral symmetry V(2) O(3) (R) above 510 °C. Furthermore, the prepared V(2) O(3) porous urchinlike micronanostructures, as anode materials in aqueous lithium ion batteries, exhibit improved electrochemical properties with relatively high first discharge capacity and better cycle retention relative to thermodynamically stable V(2) O(3) (R), which is derived from its unique microscopic crystal structure and macroscopic 3D framework with rigid morphology, porous structure, and high specific surface area.
新型多相对 V(2)O(3)多孔 urchin 状微米结构首次通过一种简单的自上而下策略大规模制备，即将乙二氧基钒前体在没有任何模板或基质的情况下进行热解。热解机制首次通过同步辐射真空紫外（VUV）光致电离质谱得到了清晰的揭示。新型多相对 V(2)O(3)具有体心立方金红石结构，并表现出从亚稳立方对称到热力学稳定的三方对称 V(2)O(3)(R)的结构演变，在 510°C 以上。此外，所制备的 V(2)O(3)多孔 urchin 状微米结构作为锂离子电池在水溶液中的阳极材料，表现出改进的电化学性能，具有相对较高的首次放电容量和更好的循环保持率，优于热力学稳定的 V(2)O(3)(R)，这归因于其独特的微观晶体结构和宏观 3D 框架，具有刚性形态、多孔结构和高比表面积。
