Optimized performance of Na0.67Mn0.5Fe0.5O2@TiO2 and presodiated hard carbon (Pre-SHC) full-cells using direct contact method

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dc.contributor.authorDogan, Ebru
dc.contributor.authorWhba, Rawdah
dc.contributor.authorAltin, Emine
dc.contributor.authorMoeez, Iqra
dc.contributor.authorChung, Kyung Yoon
dc.contributor.authorStoyanova, Radostina
dc.contributor.authorKoleva, Violeta
dc.date.accessioned2026-04-04T13:34:59Z
dc.date.available2026-04-04T13:34:59Z
dc.date.issued2025
dc.departmentİnönü Üniversitesi
dc.description.abstractWe report the synthesis and electrochemical performance of an optimized core-shell structure composed of P2type Na0.67Mn0.5Fe0.5O2 coated with TiO2. The structural properties are characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM), which confirm the successful formation of the core-shell structure. Electrochemical performance is evaluated through tests on halfcells and full-cells. Na0.67Mn0.5Fe0.5O2@TiO2 as cathode and sodium metal as anode are used in half-cells, while in full-cells, presodiated hard carbon (Pre-SHC) anodes are prepared via a direct-contact method. Cyclic voltammetry (CV) tests show similar redox behavior for uncoated and TiO2-coated Na0.67Mn0.5Fe0.5O2. Galvanostatic cycling tests are performed using two different voltage windows of 1.5-3.5 V and 1.5-4.3 V and capacity retention values are compared. Performance analysis of the full-cells reveals the best conditions for the presodiation process for the hard carbon (HC) anode. The first charge and discharge capacity values are used to determine the optimized presodiation conditions. Long-term cycling tests for both uncoated and TiO2-coated Na0.67Mn0.5Fe0.5O2 cathodes show significantly improved capacity retention and stability for the Na0.67Mn.0.5Fe0.5O2 @TiO2 cathode over 500 cycles at 0.5 and 1.0C rates. This study highlights the effectiveness of the TiO2 coating in enhancing the electrochemical performance and stability of Na0.67Mn0.5Fe0.5O2 cathode material.
dc.description.sponsorshipThe project MASTER (M-ERA) [K Pcy;- 06-DO02/3]; TUBITAK [TUBITAK-123N412]
dc.description.sponsorshipThe authors gratefully acknowledge the financial support from the project MASTER (M-ERA, K & Pcy;- 06-DO02/3 dated May 18, 2023) and extend their thanks to TUBITAK for their funding support under Project number TUBITAK-123N412.
dc.identifier.doi10.1016/j.jpowsour.2025.236327
dc.identifier.issn0378-7753
dc.identifier.issn1873-2755
dc.identifier.orcid0000-0002-5482-4772
dc.identifier.orcid0000-0002-1273-746X
dc.identifier.orcid0000-0002-4786-897X
dc.identifier.orcid0000-0002-4590-907X
dc.identifier.scopus2-s2.0-85216223414
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.jpowsour.2025.236327
dc.identifier.urihttps://hdl.handle.net/11616/109515
dc.identifier.volume632
dc.identifier.wosWOS:001421351800001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofJournal of Power Sources
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250329
dc.subjectSodium-ion batteries
dc.subjectTiO 2 coating
dc.subjectPresodiated hard carbon
dc.subjectDirect-contact method
dc.subjectCore-shell structure
dc.titleOptimized performance of Na0.67Mn0.5Fe0.5O2@TiO2 and presodiated hard carbon (Pre-SHC) full-cells using direct contact method
dc.typeArticle

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