Double-Shelled Nanocapsules of V2O5-Based Composites as High-Performance Anode and Cathode Materials for Li Ion Batteries
Double-Shelled Nanocapsules of V2O5-Based Composites as High-Performance Anode and Cathode Materials for Li Ion Batteries
复制标题
V2O5基复合材料双壳纳米胶囊作为高性能锂离子电池正负极材料
DOI：
10.1021/ja9053256
复制
发表时间：
2009-09-02
影响因子：
15
通讯作者：
Lu, Li
中科院分区：
文献类型：
--
作者：
Liu, Jun;Xia, Hui;Lu, Li
采用一锅溶液法制备了V2O5-SnO2复合材料的双壳纳米包壳。这些空心纳米胶囊由双壳V2O5基质组成，其中包括低重量比的SnO2（例如，10%或15%）。在这些双壳中，开放结构的V2O5不仅作为支撑基质，而且作为活性电极成分。两个壳体之间的间隙和空心腔为转化反应和锂合金化/脱合金过程中的体积变化提供了足够的空间。作为一种很有前途的阳极电极，这种纳米复合材料在250 mA g（-1）的速率下显示出947 mA h g（-1）的大可逆容量，并且在50次循环后保持673 mA h g（-1）的高容量。即使在2500 mA g（-1）的高速率下，当前的纳米复合电极仍然可以提供505 mA h g（-1）的可逆容量。作为阴极电极，我们的纳米复合材料不仅具有类似于250 mA h g（-1）的高可逆容量，而且具有良好的循环和倍率能力。
Double-shelled nanocapsutes of V2O5-SnO2 composites were chemically assembled via a one-pot solution method. These hollow nanocapsules are composed of a double-shelled V2O5 matrix that includes a low weight ratio of SnO2 (e.g., 10 or 15%). In these double shells, open-structured V2O5 acts as not only a supporting matrix but also an active electrode component. The gap between the two shells and the hollow cavity provide sufficient space for volume variation during conversion reactions and lithium alloying/dealloying processes. As a promising anode electrode, this nanocomposite shows a large, reversible capacity of 947 mA h g(-1) at a rate of 250 mA g(-1) and retains a high capacity of 673 mA h g(-1) after 50 cycles. Even at a high rate of 2500 mA g(-1), the current nanocomposite electrode can still deliver a reversible capacity of 505 mA h g(-1). As a cathode electrode, our nanocomposite shows not only a high reversible capacity of similar to 250 mA h g(-1) but also good cycling and rate capability.