We propose a promising synthetic technique, which we term 'self-supported nanostructuring', for the direct growth of one-dimensional, SnO2 nanowires on the current collector. The technique is based on a vapor-liquid-solid (VLS) mechanism via thermal evaporation at low synthetic temperature (600 °C). The as-synthesized SnO2 nanowire electrode did not have any buffer layer prior to the nanowire evolution, and exhibited a single crystalline phase with highly uniform morphology and a thin diameter ranging from 40 to 50nm with a length of more than 1 μm. The SnO2 nanowire electrode demonstrated stable cycling behaviors and delivered a high specific discharge capacity of 510mAhg-1, even at the 50th cycle, which exceeded that of SnO2 nanopowder and Sn nanopowder electrodes. Furthermore, the SnO2 nanowire electrode displayed superior rate capabilities with a rechargeable discharge capacity of 600mAhg-1 at 3C (where 1C = 782mAg-1), 530mAhg-1 at 5C, and 440mAhg-1 at 10C. Our results support the potential opportunity for developing high-performance Li-ion batteries based on Li-alloying anode materials in terms of high-power density and high-energy density.
|Publication status||Published - 2009|
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Electrical and Electronic Engineering