Three-dimensional porous V2O5 hierarchical octahedrons with adjustable pore architectures for long-life lithium batteries
Three-dimensional porous V2O5 hierarchical octahedrons with adjustable pore architectures for long-life lithium batteries
复制标题
具有可调孔结构的三维多孔V2O5分级八面体用于长寿命锂电池
DOI：
10.1007/s12274-014-0638-1
复制
发表时间：
2015-02-01
期刊：
影响因子：
9.9
通讯作者：
Mai, Liqiang
中科院分区：
文献类型：
--
作者：
An, Qinyou;Zhang, Pengfei;Mai, Liqiang
以新制备的钒铵（AVO）八面体为原料，采用固态转化法制备了三维多孔V2O5八面体。AVO八面体的形成是盖层试剂选择性吸附和生长物质有利过饱和的结果。随后，对AVO八面体进行煅烧处理，简单热裂解得到三维多孔V2O5八面体。作为锂电池正极材料，多孔V2O5八面体阴极在2.4-4 V范围内的高倍率下容量可达96 mA·g−1，循环500次后容量损失很小，这可归因于其高比表面积和可调的孔隙结构。重要的是，这种简单的固态热转换策略可以很容易地扩展到可控制地制造具有特定表面纹理和形态的其他多孔金属氧化物微/纳米材料。
Three-dimensional (3D) porous V2O5 octahedrons have been successfully fabricated via a solid-state conversion process of freshly prepared ammonium vanadium oxide (AVO) octahedrons. The formation of AVO octahedrons is a result of the selective adsorption of capping reagents and the favourable supersaturation of growth species. Subsequently, 3D porous V2O5 octahedrons were obtained by simple thermolysis of the AVO octahedrons via a calcination treatment. As cathode material for lithium batteries, the porous V2O5 octahedron cathode exhibits a capacity of 96 mA·g−1 at high rate up to 2 A·g−1 in the rang of 2.4–4 V and excellent cyclability with little capacity loss after 500 cycles, which can be ascribed to its high specific surface area and tunable pore architecture. Importantly, this facile solid-state thermal conversion strategy can be easily extended to controllably fabricate other porous metal oxide micro/nano materials with specific surface textures and morphologies.