艾奇逊炉提纯碳纳米管的组织结构性能表征

Characterization of Structure and Properties of CNT Purified by Acheson Furnace

碳纳米管作为锂离子电池正极导电剂已经在中国得到了普遍应用,作为电池导电剂的碳纳米管需要提纯处理。本文研究了利用艾奇逊炉对化学气相沉积的碳纳米管在3 000℃进行提纯处理后的组织结构和电学性能,利用扫描电子显微镜(SEM),电子能谱仪(EDS),等离子体发射光谱仪(ICP),红外光谱仪(FT-IR),热重分析仪(TGA),X射线光电子谱仪(XPS),拉曼光谱分析仪,四探针薄膜电阻仪对艾奇逊炉提纯的碳纳米管进行了检测。结果表明高温提纯的碳纳米管的含铁量可降低到71ppm,氧化物含量低于0.45wt%,晶格缺陷大幅减少,石墨组织结构完整,表面官能团少,具有体积电阻率0.050~0.035Ω·cm,作为电池电极的导电材料,可以用于动力电池正极。

Carbon nanotubes(CNT), as a conducting material, have been widely used in the Chinese battery industry. CNT need to be purified for use in battery as conducting agent. Here, CNTs prepared by chemical vapor deposition(CVD) were purified at 3 000 ℃ using Acheson furnace and the structure and electrical behavior of the CNT were investigated. The CNT were characterized in detail with SEM, EDS, ICP, FT-IR, TGA, XPS, Raman and Four point resistor. The results show that the CNT purified at high temperature only have less than 71 ppm(weight percent) iron content, and 0.45 wt% oxides content. Besides, the CNT also have a better graphite crystal structure and fewer surface function group. The volume resistivity of the CNT ranges from 0.050 Ω·cm to 0.035 Ω·cm. As a conductive material of battery electrode, it can be used as positive electrode of power battery.