Dual-ion intercalation to enable high-capacity VOPO4 cathodes for Na-ion batteries
dc.contributor.author | Zhang, Z | en_AU |
dc.contributor.author | Ni, Y | en_AU |
dc.contributor.author | Avdeev, M | en_AU |
dc.contributor.author | Kan, WH | en_AU |
dc.contributor.author | He, G | en_AU |
dc.date.accessioned | 2021-07-09T04:42:34Z | en_AU |
dc.date.available | 2021-07-09T04:42:34Z | en_AU |
dc.date.issued | 2021-01-01 | en_AU |
dc.date.statistics | 2021-07-05 | en_AU |
dc.description.abstract | VOPO4 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.articlenumber | 137376 | en_AU |
dc.identifier.citation | Zhang, 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.2020.137376 | en_AU |
dc.identifier.issn | 0013-4686 | en_AU |
dc.identifier.journaltitle | Electrochimica Acta | en_AU |
dc.identifier.uri | https://doi.org/10.1016/j.electacta.2020.137376 | en_AU |
dc.identifier.uri | https://apo.ansto.gov.au/dspace/handle/10238/11046 | en_AU |
dc.identifier.volume | 365 | en_AU |
dc.language.iso | en | en_AU |
dc.publisher | Elsevier | en_AU |
dc.subject | Cathodes | en_AU |
dc.subject | Electrodes | en_AU |
dc.subject | Valence | en_AU |
dc.subject | Lithium ion batteries | en_AU |
dc.subject | Electric batteries | en_AU |
dc.subject | Redox potential | en_AU |
dc.title | Dual-ion intercalation to enable high-capacity VOPO4 cathodes for Na-ion batteries | en_AU |
dc.type | Journal Article | en_AU |
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