1. Amorphous Tin Oxide Nanohelix Structure Based Electrode for Highly Reversible Na-Ion Batteries
- Author
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Jinwoo Lee, Changshin Jo, Won-Gwang Lim, Il Yong Choi, Jong-Chan Han, Chan Gyung Park, Jong Kyu Kim, and Byeong-Gyu Chae
- Subjects
Materials science ,Composite number ,General Engineering ,General Physics and Astronomy ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Tin oxide ,01 natural sciences ,0104 chemical sciences ,Amorphous solid ,Chemical engineering ,Oxidation state ,Electrode ,General Materials Science ,0210 nano-technology ,Porosity ,Deposition (law) - Abstract
An array of amorphous tin oxide (a-SnOx) 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 SnOx 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–1 after 50 cycles, fast rate capability with 48.1% retention at 2 A g–1, and high stability, which are superior to those of crystalline nanoparticle-based electrodes.
- Published
- 2019