| Summary: | 碩士 === 中華科技大學 === 機電光工程研究所碩士班 === 101 === Due to the quick leap on battery technology in recent years, the application of lithium-ion battery is expanding very fast. Its market orientation has moved to energetic application field from consumer electronics. However, related researches mostly focus on surface modification of graphite anode materials. By contrast, subjects about electro-conductive additives and electrolyte are relatively rare. This research took modification experiment of adding carbon nanotubes on natural graphite anode material. Due to the poor dispersing effect of carbon nanotubes, PVA was utilized as the dispersant in the process. After coating the natural graphite with PVA, modification was carried on by adding carbon nanotubes in different ratio in order to increase the electrochemical properties as well as raise rate and cycle performance of the battery. The results show that the coating natural graphite with 3 wt.% PVC and then adding 2 wt.% carbon nanotubes as electro-conductive additive could achieve 361.0 mAh/g in discharge capacity. Moreover, rate and cycle performance of the lithium ion battery were greatly improved at the same time.
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