Amorphous Tin Oxide Nanohelix Structure Based Electrode for Highly Reversible Na-Ion Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 31070885.
- Also identified by DOI 10.1021/acsnano.8b09773.
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Abstract
An array of amorphous tin oxide (a-SnO<sub>x</sub>) nanohelixes (NHs) was fabricated on copper foil as an electrode for Na-ion batteries via the oblique angle deposition method, a solution- and surfactant-free process. The combination of the amorphous phase SnO<sub>x</sub> with a low oxidation number and its vertically aligned NH geometry with a large surface area and high porosity, which facilitate Na-ion dynamics and accommodate the volume changes, enabled a reversible capacity of up to 915 mA h g<sup>-1</sup> after 50 cycles, fast rate capability with 48.1% retention at 2 A g<sup>-1</sup>, and high stability, which are superior to those of crystalline nanoparticle-based electrodes.