Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/9950
Title: P2-Na0.6[Cr0.6Ti0.4]O2 cation-disordered electrode for high-rate symmetric rechargeable sodium-ion batteries
Authors: Wang, Y
Xiao, R
Hu, YS
Avdeev, M
Chen, L
Keywords: Radioisotope batteries
Transition elements
Alkali metals
Electrodes
Cathodes
Electrochemical cells
Oxides
Issue Date: 24-Apr-2015
Publisher: Springer Nature
Citation: Wang, Y., Xiao, R., Hu, Y., Avdeev, M., & Chen, L.(2015). P2-Na0.6[Cr0.6Ti0.4]O2 cation-disordered electrode for high-rate symmetric rechargeable sodium-ion batteries. Nature Communications 6, 6954. doi:10.1038/ncomms7954
Abstract: Most P2-type layered oxides exhibit Na+/vacancy-ordered superstructures because of strong Na+–Na+ interaction in the alkali metal layer and charge ordering in the transition metal layer. These superstructures evidenced by voltage plateaus in the electrochemical curves limit the Na+ ion transport kinetics and cycle performance in rechargeable batteries. Here we show that such Na+/vacancy ordering can be avoided by choosing the transition metal ions with similar ionic radii and different redox potentials, for example, Cr3+ and Ti4+. The designed P2-Na0.6[Cr0.6Ti0.4]O2 is completely Na+/vacancy-disordered at any sodium content and displays excellent rate capability and long cycle life. A symmetric sodium-ion battery using the same P2-Na0.6[Cr0.6Ti0.4]O2 electrode delivers 75% of the initial capacity at 12C rate. Our contribution demonstrates that the approach of preventing Na+/vacancy ordering by breaking charge ordering in the transition metal layer opens a simple way to design disordered electrode materials with high power density and long cycle life. Copyright © 2015, The Author(s)
URI: https://doi.org/10.1038/ncomms7954
https://apo.ansto.gov.au/dspace/handle/10238/9950
ISSN: 2041-1723
Appears in Collections:Journal Articles

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