Influence of precursor selection on the structural integrity and electrochemical performance of α-NaMnO2 cathode

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dc.contributor.authorDogan, Ebru
dc.contributor.authorWhba, Rawdah
dc.contributor.authorCanbay, Canan Aksu
dc.contributor.authorArshad, Muhammad
dc.contributor.authorSahinbay, Sevda
dc.contributor.authorAltin, Serdar
dc.date.accessioned2026-04-04T13:33:22Z
dc.date.available2026-04-04T13:33:22Z
dc.date.issued2025
dc.departmentİnönü Üniversitesi
dc.description.abstractIn this study, the alpha-NaMnO2 phase was successfully synthesized using three different combinations of starting materials: Na2O2/Mn2O3, Na2O2/MnO2, and Na2CO3/Mn2O3. A one-step heat treatment at 900 degrees C for 5 h under air with quenching was applied. X-ray diffraction analysis confirmed the formation of pure alpha-NaMnO2 phase in all three samples, with only slight variations in lattice parameters. Elemental and oxidation state analyses were conducted using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy with energy-dispersive X-ray spectroscopy, and inductively coupled plasma measurements. XPS results revealed noticeable differences in Mn ion valence states, suggesting variations in oxygen stoichiometry and the presence of oxygen-excess structures. Electrochemical evaluations were performed in both half-cell and full-cell configurations. The samples exhibited distinct performance characteristics, with capacity fade over 100 cycles at C/3 between 1.5 and 4.3 V measured at 83.6%, 73.9%, and 83.1%, respectively. These differences correlated with the average oxidation state of Mn and O content. Full-cells, paired with presodiated commercial hard carbon anodes, showed the highest capacity for the Na2O2/MnO2 system and the best retention for the Na2CO3/Mn2O3 sample. Overall, this work demonstrates how even small variations in starting materials can significantly influence the structural and electrochemical behavior of alpha-NaMnO2.
dc.description.sponsorshipTUBITAK [TUBITAK-123M238]
dc.description.sponsorshipTUBITAK, Grant/Award Number:TUBITAK-123M238
dc.identifier.doi10.1111/jace.70217
dc.identifier.issn0002-7820
dc.identifier.issn1551-2916
dc.identifier.issue12
dc.identifier.orcid0000-0002-4590-907X
dc.identifier.scopus2-s2.0-105014760698
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1111/jace.70217
dc.identifier.urihttps://hdl.handle.net/11616/109096
dc.identifier.volume108
dc.identifier.wosWOS:001560465400001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofJournal of the American Ceramic Society
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250329
dc.subjectcathode materials
dc.subjectex situ analysis
dc.subjectfull-cell performance
dc.subjecthard carbon
dc.subjectpresodiated
dc.subjectalpha-NaMnO2
dc.titleInfluence of precursor selection on the structural integrity and electrochemical performance of α-NaMnO2 cathode
dc.typeArticle

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