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AuthorNisar U.
AuthorShakoor R.A.
AuthorEssehli R.
AuthorAmin R.
AuthorOrayech B.
AuthorAhmad Z.
AuthorKumar P.R.
AuthorKahraman R.
AuthorAl-Qaradawi S.
AuthorSoliman A.
Available date2019-11-03T11:47:37Z
Publication Date2018
Publication NameElectrochimica Acta
ResourceScopus
ISSN134686
URIhttp://dx.doi.org/10.1016/j.electacta.2018.09.111
URIhttp://hdl.handle.net/10576/12205
AbstractNa4MnV(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.
SponsorThe authors acknowledge the financial support from the Center for Advanced Materials (CAM), Qatar University, Doha, Qatar. The authors would also like to thank Mar�a J�uregui and Damien Saurel from XRD platform at CIC Energigune for her help for the in situ-XRD measurements. Appendix A
Languageen
PublisherElsevier Ltd
SubjectCathode materials
Charge/discharge capacity
Crystal structure
In-situ XRD analysis
Intercalation/de-intercalation
Sodium ion batteries
TitleSodium intercalation/de-intercalation mechanism in Na4MnV(PO4)3 cathode materials
TypeArticle
Pagination98 - 106
Volume Number292
dc.accessType Abstract Only


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