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Diffusion mechanism in the sodium-ion battery material sodium cobaltate.
- Source :
-
Scientific reports [Sci Rep] 2018 Feb 16; Vol. 8 (1), pp. 3210. Date of Electronic Publication: 2018 Feb 16. - Publication Year :
- 2018
-
Abstract
- High performance batteries based on the movement of Li ions in Li <subscript>x</subscript> CoO <subscript>2</subscript> have made possible a revolution in mobile electronic technology, from laptops to mobile phones. However, the scarcity of Li and the demand for energy storage for renewables has led to intense interest in Na-ion batteries, including structurally-related Na <subscript>x</subscript> CoO <subscript>2</subscript> . Here we have determined the diffusion mechanism for Na <subscript>0.8</subscript> CoO <subscript>2</subscript> using diffuse x-ray scattering, quasi-elastic neutron scattering and ab-initio molecular dynamics simulations, and we find that the sodium ordering provides diffusion pathways and governs the diffusion rate. Above T ~ 290 K the so-called partially disordered stripe superstructure provides channels for quasi-1D diffusion, and melting of the sodium ordering leads to 2D superionic diffusion above T ~ 370 K. We obtain quantitative agreement between our microscopic study of the hopping mechanism and bulk self-diffusion measurements. Our approach can be applied widely to other Na- or Li-ion battery materials.
Details
- Language :
- English
- ISSN :
- 2045-2322
- Volume :
- 8
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Scientific reports
- Publication Type :
- Academic Journal
- Accession number :
- 29453391
- Full Text :
- https://doi.org/10.1038/s41598-018-21354-5