Diffusion mechanism in the sodium-ion battery material sodium cobaltate

Abstract : High performance batteries based on the movement of Li ions in Li x CoO2 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 x CoO2. Here we have determined the diffusion mechanism for Na0.8CoO2 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.
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Scientific Reports, Nature Publishing Group, 2018, 8 (1), pp.3210 - 3210. 〈10.1038/s41598-018-21354-5〉
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Soumis le : lundi 23 juillet 2018 - 14:24:52
Dernière modification le : mercredi 8 août 2018 - 01:09:12

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T Willis, D. Porter, D Voneshen, S. Uthayakumar, F. Demmel, et al.. Diffusion mechanism in the sodium-ion battery material sodium cobaltate. Scientific Reports, Nature Publishing Group, 2018, 8 (1), pp.3210 - 3210. 〈10.1038/s41598-018-21354-5〉. 〈hal-01847278〉

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