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Synthesis and characterization of negative electrode materials for Li-ion battery
with water electrolyte.
T. Petkov1, L. Petkov1, T. Stankulov2 A. Momchilov2
1
2
University of Chemical Technology and Metalurgy, Sofia, Bulgaria
Institute of Electrochemistry and Energy Systems
Abstract
LiV3O8 was synthesized and physico-chemically characterized by HRD, SEM, TGA and
BET analyses. LiV3O8 was synthesized from V2O5 and Li2CO3 by melting. The obtained
sample was grinded for two hours in a ball mill to obtain relatively small particles from
the melt. Further, the particles were treated by water vapor in autoclave at 200oC for a 24
hours. The BET of the sample become 8 times about higher after autoclave treatment.
Thus, the particle size decrease rapidly which is clearly evident from the SEM pictures.
The TGA analysis of the autoclave treated sample shows that up to 3 water molecules can
be inserted in the layered structure of the lithium three-vanadate. This fact is confirmed
via XRD analysis were is evident that the peak 100, that gives the interlayer distance,
changed from 2Θ = 6.68 Ǻ up to 11.7 Ǻ.
An commercial sample of MoO3 was used for the investigations and was similarly
physico-chemically characterized.
Both samples were electrochemically investigated via Slow Cycling Voltammetry
against calomel reference electrode in electrolyte of 6M LiNO3 water solution.
Unfortunately, the cyclebility of LiV3O8 is very pure comparing to that of MoO3.