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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
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. � 2018 Elsevier Ltd
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
PublisherElsevier Ltd
SubjectCathode materials
SubjectCharge/discharge capacity
SubjectCrystal structure
SubjectIn-situ XRD analysis
SubjectSodium ion batteries
TitleSodium intercalation/de-intercalation mechanism in Na4MnV(PO4)3 cathode materials
Pagination98 - 106
Volume Number292

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