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Amorphous and Nanocrystalline Oxide Electrodes for Rechargeable Lithium Batteries

Published online by Cambridge University Press:  10 February 2011

A. Manthiram ,
J. Kim  and
C. Tsang
A. Manthiram
Affiliation:
Center for Materials Science and Engineering, ETC 9.104, The University of Texas at Austin, Austin, TX 787I2
J. Kim
Affiliation:
Center for Materials Science and Engineering, ETC 9.104, The University of Texas at Austin, Austin, TX 787I2
C. Tsang
Affiliation:
Center for Materials Science and Engineering, ETC 9.104, The University of Texas at Austin, Austin, TX 787I2
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Abstract

Oxo ions (MO4)n- (M = V, Cr, Mn and Mo) have been reduced in aqueous solutions with potassium borohydride to obtain the binary oxides MO2+δ. While the vanadium and manganese oxides are nanocrystalline, the chromium and molybdenum oxides are amorphous. The nanocrystalline VO2 having a metastable structure and the amorphous CrO2 and MoO2.3 transform to the thermodynamically more stable phases upon heating above 300–400 °C. These metastable oxides after heating in vacuum at 200–300 °C to remove water show good electrode performance in lithium cells. VO2, CrO2 and MoO2.3 show a reversible capacity of, respectively, 290 mAh/g in the range 4–1.5 V, 180 mAh/g in the range 3.3–2.3 V, and 220 mAh/g in the range 3–1 V. MnO2 obtained by this process does not show good electrode properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 421
Copyright
Copyright © Materials Research Society 1998

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References

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