P2-type Na0.67Mn0.5-xVxFe0.43Ti0.07O2 powders for Na-ion cathodes: Ex-situ structural analysis and full-cell study

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dc.authoridALTUNDAĞ, Sebahat/0000-0002-4777-8376
dc.authoridALTIN, Serdar/0000-0002-4590-907X
dc.authorwosidOz, Erdinc/GXW-0937-2022
dc.authorwosidALTUNDAĞ, Sebahat/AAB-4167-2021
dc.authorwosidALTIN, Serdar/H-4880-2014
dc.contributor.authorDogan, Ebru
dc.contributor.authorAltundag, Sebahat
dc.contributor.authorAltin, Emine
dc.contributor.authorOz, Erdinc
dc.contributor.authorAltin, Serdar
dc.date.accessioned2024-08-04T20:54:50Z
dc.date.available2024-08-04T20:54:50Z
dc.date.issued2024
dc.departmentİnönü Üniversitesien_US
dc.description.abstractThis study used a modified solid-state synthesis technique to synthesize Na0.67Mn0.5-xVxFe0.43Ti0.07O2 (x = 0.02 0.1) cathode materials. The XRD pattern shows that there are no impurity phases in the samples for x <= 0.06. The granular grain formation was observed in each sample and the largest surface area was obtained for x = 0.06 Vdoped composition. According to XPS analysis of the x = 0.06 sample, the V and Ti ions have three different valence states in the structure and the ratio of V3+/V4+/V5+ ions in the powders was calculated as 13 %/36 %/51 % and the spin splitting binding energy gaps were found as 7.1 eV for each V-ions and they affected by cycling process. The redox mechanism of the half cells was investigated at 10 degrees C and room temperature. The diffusion coefficient values of Na+ were calculated by cycling voltammetry (CV) and GITT techniques for the x = 0.06. Although the highest capacity of the half cells for the V-substituted samples was found to be 188.3 mAh/g for x = 0.02 V-doping in the cells for C/3-rate, the best capacity fade among the cells was obtained for x = 0.06 as 36.9 %. The ex-situ analysis of the electrodes after 100 cycles at the environmental temperatures of 10 degrees C, 50 degrees C, and 60 degrees C was investigated and it was found that the valence state of the elements changed by the cycling process. The artificial solid electrolyte interface (SEI) formation on the anode surface was performed by presodiation technique and the full cells were assembled using Na0.67Mn0.44V0.06Fe0.43Ti0.07O2/hard carbon architecture and the obtained first capacity values for C/3-rate were 90.1 mAh/g and 66.6 mAh/g, respectively, and the capacity value decreased with the cycling process up to 60 cycles and then gave a plateau with increasing cycle numbers up to 500 cycles.en_US
dc.description.sponsorshipTUBITAK [225N335]; Inonu University [FYL-2022-3100]en_US
dc.description.sponsorshipThe Authors would like to acknowledge the financial support of TUBITAK under project number 225N335. S. Altin and E. Dogan would like to acknowledge the financial support of Inonu University under project number FYL-2022-3100.en_US
dc.identifier.doi10.1016/j.electacta.2023.143470
dc.identifier.issn0013-4686
dc.identifier.issn1873-3859
dc.identifier.scopus2-s2.0-85176504935en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.electacta.2023.143470
dc.identifier.urihttps://hdl.handle.net/11616/101670
dc.identifier.volume473en_US
dc.identifier.wosWOS:001112332200001en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherPergamon-Elsevier Science Ltden_US
dc.relation.ispartofElectrochimica Actaen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectNa-ion full cellen_US
dc.subjectV-dopingen_US
dc.titleP2-type Na0.67Mn0.5-xVxFe0.43Ti0.07O2 powders for Na-ion cathodes: Ex-situ structural analysis and full-cell studyen_US
dc.typeArticleen_US

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