Double-Shelled Nanocapsules of V2O5-Based Composites as High-Performance Anode and Cathode Materials for Li Ion Batteries

J Liu, H Xia, D Xue, L Lu - Journal of the American Chemical …, 2009 - ACS Publications
Journal of the American Chemical Society, 2009ACS Publications
Double-shelled nanocapsules 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 (eg, 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 …
Double-shelled nanocapsules 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 ∼250 mA h g−1 but also good cycling and rate capability.
ACS Publications
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