Dual-ion intercalation to enable high-capacity VOPO4 cathodes for Na-ion batteries

dc.contributor.authorZhang, Zen_AU
dc.contributor.authorNi, Yen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorKan, WHen_AU
dc.contributor.authorHe, Gen_AU
dc.date.accessioned2021-07-09T04:42:34Zen_AU
dc.date.available2021-07-09T04:42:34Zen_AU
dc.date.issued2021-01-01en_AU
dc.date.statistics2021-07-05en_AU
dc.description.abstractVOPO4 is a potential cathode candidate in sodium-ion batteries for multi-electron reactions to attain high capacity up to 330 mAh g−1. However, most current efforts are focused on the V5+/V4+ redox reaction with a moderate capacity of <150 mAh g−1. Here, we report for the first time the Na intercalation behaviors for both αI- and β-VOPO4 polymorph cathodes through the V5+/V4+/V3+ redox reactions. Electrochemical evaluations suggest further reduction of V4+ ions can be attained for both cathodes, as indicated by the high discharge capacities derived from a large plateau below 1.5 V vs Na/Na+ as well as various structural analyses of electrodes at different discharge states. However, only the layered αI- cathode is preferable for deep sodiation to maintain stable structure over cycling. Theoretical studies by bond-valence sum (BVS) mismatch map calculations reveal similar Na-ion migration pathways in VOPO4•2H2O and αI-NaVOPO4, but H2O molecules in the hydrate cathode have negative effect on the diffusion of Na-ions in betweenVOPO4 layers. © 2020 Elsevier Ltd. All rights reserved.en_AU
dc.identifier.articlenumber137376en_AU
dc.identifier.citationZhang, Z., Ni, Y., Avdeev, M., Kan, W. H., & He, G. (2021). Dual-ion intercalation to enable high-capacity VOPO4 cathodes for Na-ion batteries. Electrochimica Acta, 365, 137376. doi:10.1016/j.electacta.2020.137376en_AU
dc.identifier.issn0013-4686en_AU
dc.identifier.journaltitleElectrochimica Actaen_AU
dc.identifier.urihttps://doi.org/10.1016/j.electacta.2020.137376en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11046en_AU
dc.identifier.volume365en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCathodesen_AU
dc.subjectElectrodesen_AU
dc.subjectValenceen_AU
dc.subjectLithium ion batteriesen_AU
dc.subjectElectric batteriesen_AU
dc.subjectRedox potentialen_AU
dc.titleDual-ion intercalation to enable high-capacity VOPO4 cathodes for Na-ion batteriesen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Collections