奈米碳管對鋰電池負極材料電化學性質之影響

近年來由於鋰離子電池技術快速的進步，使得其應用市場快速擴張，已從消費性電子產品逐漸往能源應用市場發展。然而在鋰離子電池研究中，負極材料大多以石墨的表面改質為主，而以導電添加劑為研究方向的題材較少。本研究是以奈米碳管添加於天然石墨負極材料進行改質實驗，因奈米碳管分散效果不佳，故採用高分子樹脂PVA做為分散劑，於天然石墨先進行包覆，再依添加不同比例之奈米碳管進行改質，以增進鋰離子電池的電化學性能，提升鋰離子電池的充放電倍率性與循環性。實驗結果顯示，以3 wt.%之高分子樹脂PVA包覆石墨做為分散劑，再添加2 wt.%之奈米碳管作為導電劑，其第一次放電量可達到361.0 mAh/g，並大幅改善電池的倍率性與循環性。

關鍵字

鋰電池；天然石墨；奈米碳管；倍率性；循環性

並列摘要

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 conductive additives are relatively rare. This research took modification experiment of adding carbon nanotubes with 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.

並列關鍵字

Lithium ion battery ； Natural graphite ； Carbon nanotubes ； Rate performance ； Cycle performance

國際替代計量

奈米碳管對鋰電池負極材料電化學性質之影響

未授權

主題瀏覽