Work

Effect of Iron Substitution in the Electrochemical Performance of Na3V2(PO4)3as Cathode for Na-Ion Batteries

Year: 2015

Type: article

Abstract: Na 3 V 2-x Fe x (PO 4 ) 3 /C (0 ≤ x ≤ 0.5) samples were prepared by a simple sol-gel method. X-ray diffraction patterns revealed high purity and crystalline phosphate indexed in the R-3c space group. On increasing the iron content, the cell volume increases due to the slightly higher radius of Fe 3+ . Cyclic voltammetry showed two signals at ca. 3.5 and 4.0 V, which evidence a linear dependence of potential on the level of substitution. The appearance of the short plateau at ca. 4.0 V is closely related to the higher iron substitution levels. The evaluation of XPS and 57 Fe Mössbauer spectra of charged and discharged electrodes allow ascribing the 4.0 V plateau to V 4+ /V 5+ redox reaction and the extraction/insertion of extra sodium ions from octahedral M1 sites. Galvanostatic cycling showed capacity values as high as 115 mA h g −1 for samples with x = 0.1, 0.2, 0.3 and exceptional cyclability.

Source: Journal of The Electrochemical Society

DOI: 10.1149/2.0151502jes

Authors: M. J. Aragón, P. Lavela, G. F. Ortiz, J. L. Tirado

Institution: University of Córdoba

Language: English

Topic: Advancements in Battery Materials

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $1,950