Synthesis and performance evaluation of nanostructured NaFexCr1-X(SO4)2 cathode materials in sodium ion batteries (SIBs)

Umair Nisar, Mona Hersi Gulied, R. A. Shakoor, Rachid Essehli, Zubair Ahmad, Abdullah Alashraf, Ramazan Kahraman, Siham Al-Qaradawi, Ahmed Soliman

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Abstract

This research work focuses on the synthesis and performance evaluation of NaFexCr1-X(SO4)2 (X = 0, 0.8 and 1.0) cathode materials in sodium ion batteries (SIBs). The novel materials having a primary particle size of around 100-200 nm were synthesized through a sol-gel process by reacting stoichiometric amounts of the precursor materials. The structural analysis confirms the formation of crystalline, phase pure materials that adopt a monoclinic crystal structure. Thermal analysis indicates the superior thermal stability of NaFe0.8Cr0.2(SO4)2 when compared to NaFe(SO4)2 and NaCr(SO4)2. Galvanostatic charge/discharge analysis indicates that the intercalation/de-intercalation of a sodium ion (Na+) into/from NaFe(SO4)2 ensues at about 3.2 V due to the Fe2+/Fe3+ active redox couple. Moreover, ex situ XRD analysis confirms that the insertion/de-insertion of sodium into/from the host structure during charging/discharging is accompanied by a reversible single-phase reaction rather than a biphasic reaction. A similar sodium intercalation/de-intercalation mechanism has been noticed in NaFe0.8Cr0.2(SO4)2which has not been reported earlier. The galvanostatic measurements and X-ray photoelectron spectroscopy (XPS) analysis confirm that the Cr2+/Cr3+ redox couple is inactive in NaFexCr1-X(SO4)2 (X = 0, 0.8) and thus does not contribute to capacity augmentation. However, suitable carbon coating may lead to activation of the Cr2+/Cr3+ redox couple in these inactive materials.

Original languageEnglish
Pages (from-to)32985-32991
Number of pages7
JournalRSC Advances
Volume8
Issue number57
DOIs
Publication statusPublished - 1 Jan 2018

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Nisar, U., Gulied, M. H., Shakoor, R. A., Essehli, R., Ahmad, Z., Alashraf, A., Kahraman, R., Al-Qaradawi, S., & Soliman, A. (2018). Synthesis and performance evaluation of nanostructured NaFexCr1-X(SO4)2 cathode materials in sodium ion batteries (SIBs). RSC Advances, 8(57), 32985-32991. https://doi.org/10.1039/c8ra06583g