期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 11, 期 1, 页码 71-76出版社
SPRINGER
DOI: 10.1007/s10008-005-0071-1
关键词
vanadium oxide; sol-gel process; lithium batteries
A new V6O13-based material has been synthesized via the sol-gel route. This sol-gel mixed oxide has been obtained from an appropriate heat treatment of the chromium-exchanged V2O5 xerogel performed under reducing atmosphere. This new compound, with the chemical formula Cr0.36V6O13.50, exhibits a monoclinic structure (C2/m) with the following unit cell parameters, a=11.89 angstrom, b=3.68 angstrom, c=10.14 angstrom, beta=101.18 degrees. The electrochemical characterization of this compound has been performed using galvanostatic discharge-charge experiments in the potential range 4-1.5 V and completed by ac impedance spectroscopy measurements. It exhibits a specific capacity of about 370 mAh g(-1), which makes the compound Cr0.36V6O13.50 the best one in the V6O13-based system: 85% of the initial capacity (315 mAh g(-1)) after the 35th cycle is still available at C/25 without any polarization. From impedance spectroscopy, a high kinetics of Li transport (D (Li)=1.8x10(-9) cm(2) supercript stop s(-1)) is found at mid-discharge.
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