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Impact of Electrical Conductivity on the Electrochemical Performances of Layered Structure Lithium Trivanadate (LiV3–xMxO8, M= Zn/Co/Fe/Sn/Ti/Zr/Nb/Mo, x = 0.01–0.1) as Cathode Materials for Energy Storage
journal contribution
posted on 2018-03-13, 14:33 authored by P. Senthil Kumar, Sakunthala Ayyasamy, Eng Soon Tok, Stefan Adams, M. V. ReddyPristine
trivanadate (LiV3O8) and doped lithium
trivanadate (LiV3–xMxO8, M = Zn/Co/Fe/Sn/Ti/Zr/Nb/Mo, x = 0.01/0.05/0.1 M) compounds were prepared by a simple
reflux method in the presence of the polymer, Pluronic P123, as the
chelating agent. For comparison, pristine LiV3O8 alone was also prepared in the absence of the chelating agent. The
Rietveld-refined X-ray diffraction patterns shows all compounds to
exist in the layered monoclinic LiV3O8 phase
belonging to the space group of P21/m. Scanning electron microscopy analysis shows the particles
to exhibit layers of submicron-sized particles. The electrochemical
performances of the coin cells were compared at a current density
of 30 mA/g in the voltage window of 2–4 V. The cells made with
compounds LiV2.99Zr0.01O8 and LiV2.95Sn0.05O8 show a high discharge capacity
of 245 ± 5 mA h/g, with an excellent stability of 98% at the
end of the 50th cycle. The second cycle discharge capacity of 398
mA h/g was obtained for the compound LiV2.99Fe0.01O8, and its capacity retention was found to be 58% after
50 cycles. The electrochemical performances of the cells were correlated
with the electrical properties and the changes in the structural parameters
of the compounds.
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electrochemical performancesScanning electron microscopy analysischelating agentLiV 2.95 Sn 0.05 O 8 showLiV 3 O 8 phaseLiV 3 O 8mALayered Structure Lithium Trivanadatecompound LiV 2.99 Fe 0.01 O 8cycle discharge capacitycompounds LiV 2.99 Zr 0.01 O 8Energy Storage Pristine trivanadateRietveld-refined X-ray diffraction patterns
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