Nanostructured vanadium oxide electrodes for enhanced lithium-ion intercalation
Nanostructured vanadium oxide electrodes for enhanced lithium-ion intercalation
复制标题
DOI：
10.1002/adfm.200500662
复制
发表时间：
2006-06-06
影响因子：
19
通讯作者：
Cao, Guozhong
中科院分区：
文献类型：
--
作者：
Wang, Ying;Takahashi, Katsunori;Cao, Guozhong
本文综述了我们通过设计纳米结构和层间结构来改善钒氧化物中Li(+)的插层性能的最新研究。适当加工的纳米结构使插层能力和插层速率提高了近两个数量级。介绍了单晶V(2)O(5)纳米棒阵列、V(2)O(5)中心点NH(2)O纳米管阵列和Ni/V(2)O(5)中心点NH(2)O核/壳纳米可编程阵列的制备方法，讨论了这些纳米结构的形貌、结构和生长机理。电化学分析表明，与五氧化二钒薄膜电极相比，三种纳米结构的插层性能都表现出明显的存储容量和倍率性能。研究发现，在V(2)O(5)中添加正交晶型的V(2)O(5)会影响V(2)O(5)的结晶度、微观结构和相邻层间可能的相互作用力，从而提高V(2)O(5)中Li(+)的插层性能。V(2)O(5)中的插层量对V(2)O(5)中心点NH(2)O的层间距和电化学性能有显著影响。系统的电化学研究表明，V(2)O(5)中心点0.3H(2)O膜具有最佳的含水率和最佳的Li(+)-插层性能。
This article summarizes our most recent studies on improved Li(+)-intercalation properties in vanadium oxides by engineering the nanostructure and interlayer structure. The intercalation capacity and rate are enhanced by almost two orders of magnitude with appropriately fabricated nanostructures. Processing methods for single-crystal V(2)O(5) nanorod arrays, V(2)O(5)center dot nH(2)O nanotube arrays, and Ni/V(2)O(5)center dot nH(2)O core/shell nanocable arrays are presented; the morphologies, structures, and growth mechanisms of these nanostructures are discussed. Electrochemical analysis demonstrates that the intercalation properties of all three types of nanostructure exhibit significantly enhanced storage capacity and rate performance compared to the film electrode of vanadium pentoxide. Addition of TiO(2) orthorhombic V(2)O(5) is found to affect the crystallinity, microstructure, and possible interaction force between adjacent layers in V(2)O(5), and subsequently leads to enhanced Li(+)-intercalation properties in V(2)O(5). The amount of water intercalated in V(2)O(5) is found to have a significant influence on the interlayer spacing and electrochemical performance of V(2)O(5)center dot nH(2)O. A systematic electrochemical study has demonstrated that the V(2)O(5)center dot 0.3H(2)O film has the optimal water content and exhibits the best Li(+)-intercalation performance.