S

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Time(hrs)

Figure 5. The plots of operation time vs. votage.

Conclusions

We fabricated LiCo02-coated NiO(LC-NiO) cathode by PVA-asssisted sol-gel method. ■ After heat treatment at 800°C for 2 hours, the SEM image of LC-NiO electrode was different from that of pure NiO electrode and the fact was confirmed by Raman spectra. The electrical conductivity of LC-NiO cathode was measured to be more than 5 times as high as that of pure NiO. For 250 hours of steady operation of unit cells, the mean voltage of the cells were 0.78V for NiO and 0.85V for LC-NiO at a current density of l50mA/cm2. The efficiency improvement of LC-NiO cathode cannot be explained yet..

Reference 1

1. K. I. Ota, "Solubility of Cobalt Oxide in Molten Carbonate," J. Electrochem. Soc., Vol. 142, No. 10. pp. 3322-3326. Oct. 1995

2. H. J. Kwon, S. T. Kuk. H. B. Park, D. G. Park, K. Kim, J. Mater. Sci. Lett. 15. 428, 1996

3. X. Li, H. Zhang, J. Mater. Sci. Engng. B18, 209, 1993

4. H. Taguchi. H. Yoshioka, J. Solid State Chem., 104, 460, 1993

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Time(hrs)

Figure 5. The plots of operation time vs. votage.

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