Hierarchically structured tin oxide/reduced graphene oxide (RGO)/carbon composite powders are prepared through a one-pot spray pyrolysis process. SnO nanoflakes of several hundred nanometers in diameter and a few nanometers in thickness are uniformly distributed over the micrometer-sized spherical powder particles. The initial discharge and charge capacities of the tin oxide/RGO/carbon composite powders at a current density of 1000 mAg-1 are 1543 and 1060 mAhg-1, respectively. The discharge capacity of the tin oxide/RGO/carbon composite powders after 175 cycles is 844 mAhg-1, and the capacity retention measured from the second cycle is 80 %. The transformation during cycling of SnO nanoflakes, uniformly dispersed in the tin oxide/RGO/carbon composite powder, into ultrafine nanocrystals results in hollow nanovoids that act as buffers for the large volume changes that occur during cycling, thereby improving the cycling and rate performances of the tin oxide/RGO/carbon composite powders.
|Number of pages||5|
|Journal||Chemistry - A European Journal|
|Publication status||Published - 2014 Nov 10|
- Energy conversion
- Energy-storage materials
- Synthesis design
ASJC Scopus subject areas