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Temperature(°C)

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300 400 500 500 TemperaturefC)

300 400 500 500 TemperaturefC)

Figure 2. DSC curves of a) pure Ni electrode.

Figure 3 shows SEM images of NiO and LC-Ni electrodes after heat treatment at 800°C for 2 hours. The surface structure of LC-NiO electrode was different from that of pure NiO electrode.

The structure of NiO electrode shows many micro pores and round-shape particles. On the other hand, the surface structure of LC-NiO electrode shows few micro pores and angular-shape particles.

Figure 3. SEM images of a) pure NiO electrode, b) LC-NiO electrode after heat treatment at 800°C for 2 hours.

Figure 4 shows the Raman spectra of various electrodes. The Raman spectra of two LC-NiO electrodes(b, c) were different from that of NiO electrode(a). For LiCoO;. previous Raman spectra show two strong Raman bands at 485 and 597 cm"1. NiO Raman spectra are shown in figure 4. a). However only Raman band was observed at 597 cm'1 for two LC-NiO electrodes, which might be due to the lithiation of NiO electrodes.

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