Charging capacity and cycling stability of VO{sub x} films prepared by pulsed laser deposition
- National Renewable Energy Lab., Golden, CO (United States)
The lithium ion charging capacity and cycling stability of vanadium oxide thin-films prepared by pulsed laser deposition (PLD) are reported. PLD films were prepared at various temperatures and atmospheres from a V{sub 6}O{sub 13} target. The charging capacity of these films depended strongly on the substrate deposition temperature and atmosphere. The best crystalline films were grown at 200 C. Crystalline oriented V{sub 2}O{sub 5} films were prepared by PLD at 200 C in an oxygen environment. These films can be cycled in the voltage range between 4.1 and 2.0 V for more than 100 cycles with very little capacity loss. The specific charge capacity of the films was 340 Ah/kg when the discharge current density was 0.1 mA/cm{sup 2}, which corresponds to 1.2 lithium atoms per vanadium atom. The capacity increased to 1.5 lithium atoms per vanadium atom when cycled at a current density of 0.02 mA/cm{sup 2}. Amorphous vanadium oxide films with similar specific capacities were prepared by PLD in vacuum at 200 C. The capacity loss in these films was less than 2% after 100 cycles. Although thermally evaporated vanadium oxide films had similar initial capacities under the same charging conditions, they lost more than 17% of their charging capacity after 100 cycles. The improved cycle stability in the amorphous vanadium oxide films may be partially attributed to the improved surface morphology of the PLD films.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 511945
- Journal Information:
- Journal of the Electrochemical Society, Vol. 144, Issue 5; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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