Production of V-Doped P2-type Na0.67Mn0.5Fe0.43Al0.07O2 Cathodes and Investigation of Na-Ion Full Cells Performance

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Altın S., Doğan E., Altundağ S., Altın E.

ENERGY TECHNOLOGY, sa.1, ss.1-14, 2023 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1002/ente.202300837
  • Dergi Adı: ENERGY TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Applied Science & Technology Source, CAB Abstracts, Chimica, Compendex, Environment Index, Greenfile, INSPEC
  • Sayfa Sayıları: ss.1-14
  • İnönü Üniversitesi Adresli: Evet

Özet

The Na0.67Mn0.5xVxFe0.43Al0.07O2(x=0–0.1) samples are successfully producedand their structural properties are investigated by common techniques. Thehighest surface area is found as 4.94 m2g1forx=0.04 V by the Brunauer–Elmet–Teller analysis. According to X-ray photoelectron spectroscopy ofx=0.04 V-doped sample,V4+,and V5+ions are formed in the structure. The mainphase is observed as P63/mmc symmetry with an impurity phase of V6O13forx≥0.06 . According to the CV analysis, while the redox voltage decreases for theMn3+/Mn4+, the intensity of the peaks of Fe2+/Fe3+redox reaction decreases.While the best capacity value of the half cells at C/3-rate is obtained as171 mAh g1forx=0.04, the lowest capacity fade is found forx=0.08 . It ismentioned the V6O13may contribute to the electrochemical process . The gal-vanostatic tests are investigated for the voltage windows of 3.5–1.5, 4–1.5, 4–2.5,4–2, and 4–2.5 V and it is seen that the battery cells for 3.5–1.5 V have the bestcapacity fade (6%) among the others. The Na0.67Mn0.46V0.04Fe0.43Al0.07O2/ hardcarbon is used for the full cells with presodiated anode and thefirst capacityvalue of the full cell is obtained as 80.2 mAh g1for C/2-rate.RESEARCH ARTICLEwww.entechnol.deEnergy Technol.2023, 23008372300837 (1 of 14)© 2023 Wiley-VCH GmbH