Electrochemical Behavior of Tin Oxide Nanoparticles as Material for Negative Electrodes of Li-ion Batteries

摘要

In this work, the SnO nanomaterial was synthesized sonochemically in a one-step-reaction. It was shown by XRD studies that the material thus obtained was amorphous and could be crystallized by annealing at 200 °C. The nanocrystalline SnO particles (around 20 nm as estimated from TEM measurements) were found to be much more effective as an active material for Li-insertion electrodes than the initial amorphous phase. It was concluded that the cycling performance of anodes based on SnO nanoparticles depends strongly on the properties of the surface films formed on these electrodes. We suggest that the capacity fading of anodes is attributed to their morphological and volume changes during Li insertion/ deinsertion processes, which are accompanied by surface reactions between the Li_xSn (0 < x < 4.25) and solution species.