Sodium intercalation/de-intercalation mechanism in Na4MnV(PO4)3 cathode materials

Umair Nisar, R. A. Shakoor, Rachid Essehli, Md. Ruhul Amin, Brahim Orayech, Zubair Ahmad, P. Ramesh Kumar, Ramazan Kahraman, Siham Al-Qaradawi, Ahmed Soliman

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Abstract

Na4MnV(PO4)3 is a sodium ion conducting material with a NASICON type crystal structure. This phase is not much known as an electrode material. The present work focuses on the sodium ion intercalation/de-intercalation mechanism and charge/discharge behavior of the material. The Na4MnV(PO4)3 is synthesized through a sol-gel process and characterized by XRD, SEM, and XPS. The structural analysis confirms the formation of a phase pure crystalline material with nanometric particle size which adopts a trigonal crystal structure. Galvanostatic intermittent titration technique (GITT) measurements indicate that Na4MnV(PO4)3 is electrochemically active having slanting voltage plateaus. Ex-situ and In-situ XRD analysis, as a function of sodium concentration, indicate that the intercalation/de-intercalation of sodium is associated with a single-phase reaction rather than a biphasic reaction when cycled between 1.5 and 4.5 V. The electrochemical measurements on composite electrodes, Na4MnV(PO4)3/CNTS (1 & 3 wt.%), show promising charge/discharge capacity (∼140 mAh/g), good cyclability (100% capacity retention after 40 cycles) and reasonable rate capability. The cyclic voltammetry (CV) and X-ray Photoelectron Spectroscopy (XPS) analyses indicate that the main contributions towards the activity of Na4MnV(PO4)3 can be attributed to the active of Mn2+/Mn3+ and V3+/V4+ redox couple with partial activity of V4+/V5+. The obtained results suggest that Na4MnV(PO4)3 is a promising electrode material which can be achieved better rate performance with long cycling stability and battery performance through engineering of the particle morphology and microstructure.

Original languageEnglish
Pages (from-to)98-106
Number of pages9
JournalElectrochimica Acta
Volume292
DOIs
Publication statusPublished - 1 Dec 2018

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Keywords

  • Cathode materials
  • Charge/discharge capacity
  • Crystal structure
  • In-situ XRD analysis
  • Intercalation/de-intercalation
  • Sodium ion batteries

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Nisar, U., Shakoor, R. A., Essehli, R., Amin, M. R., Orayech, B., Ahmad, Z., Kumar, P. R., Kahraman, R., Al-Qaradawi, S., & Soliman, A. (2018). Sodium intercalation/de-intercalation mechanism in Na4MnV(PO4)3 cathode materials. Electrochimica Acta, 292, 98-106. https://doi.org/10.1016/j.electacta.2018.09.111