Fabrication and electrochemical performance of Ho-substituted C/LiFePO4: Improved battery performance

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ALTIN S., Yolun A.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, cilt.32, sa.16, ss.21568-21578, 2021 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 32 Sayı: 16
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1007/s10854-021-06665-0
  • Dergi Adı: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.21568-21578
  • İnönü Üniversitesi Adresli: Evet

Özet

Ho-substituted C/LiFePO4 samples were successfully fabricated, and their structural properties were examined by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) measurements. The magnetic structure of LiFePO4 correspondence to the high spin configuration of Fe2+ ions and Ho3+ causes the increase of the mu(eff) values and suppressed the antiferromagnetic transition. The XRD analysis showed an amorphous structure due to carbon, and peaks were matched by olivine-type LiFePO4. Furthermore, the lattice volume was increased with the addition of Ho. The Ho-substituted cells show similar cycling voltammetry (CV) graphs with the CV of the undoped LiFePO4 cells. According to charge/discharge cycling measurements for constant current at room temperature, the highest capacity was obtained for LiFe0.99Ho0.01PO4. The Ho-substituted LiFePO4 has a higher C-rate when compared with the undoped LiFePO4 and so it is found that a low concentration of Ho in LiFePO4 has better battery performance and may be used in commercial batteries.