【作者】 卢荻；

【导师】 张孝彬；

【作者基本信息】 浙江大学 ， 材料物理与化学， 2006， 硕士

【摘要】 本论文对CVD法生长的成束多壁纳米碳管进行了化学修饰及改性处理,通过SEM、TEM、XRD、FT-IR、Raman等手段对纳米碳管的结构进行了表征,考察了纳米碳管在化学改性的作用下的结构变化。在此基础上,以未改性的及改性后的多壁纳米碳管纳米碳管作为锂离子子电池负极材料制作了模拟电池,测试了它们的嵌脱锂性能,并与商品化的电极材料中间相碳微珠(MCMB)的电化学性能进行了对比。研究结果发现,混酸超声处理对于纳米碳管壁的石墨烯片层的刻蚀作用不如高温下碱处理强烈,但是混酸超声处理的多壁纳米碳管的可逆嵌锂性能优于高温下碱处理的多壁纳米碳管。经过混酸超声处理的样品的可逆容量提高到了214mAh/g,优于仅经过纯化的MWCNT的144mAh/g和经过碱高温退火的170mAh/g。结合实验结果,本文提出了一个纳米碳管可逆嵌锂的半经典的理论模型,计算出MWCNT的可逆容量约为124mAh/g～186mAh/g,可以较好的解释实验中纳米碳管的可逆容量。此外,还表征并测试了一种新型的金属锡填充纳米碳管的电化学性能,这种材料的库仑效率和可逆容量均大于中间相碳微珠(MCMR)更多还原

【Abstract】 In this work, some chemical modification were carried out to the bundled multi-walled carbon nanotube (CNT) produced by a CVD method, and the change of the structure of the MWCNT was observed through the character of SEM, TEM, XRD, FT-IR, Raman, etc. The electrochemical Lithium intercalation property of the MWCNT as the anode of lithium ion battery was examined and compared with which of middle-phase carbon micro-bead (MCMB) for the commercial anode of lithium ion battery. It is observed that the MWCNT treatment with mixed-acid under ultrasonic showed a weaker etching effect to the graphite sheet than that treated by alkali at an elevated temperature, however the former gives a better reversible electrochemical Lithium-intercalation property. The sample treated with mixed-acid under ultrasonic showed a better reversible capacity of 214mAh/g than 144mAh/g of the purified MWCNT and 170mAh/g of the alkali annealing treated MWCNT. Based on the experimental results, a quasi-classical model was established to explain the reversible capacity of MWCNT. The calculated reversible capacity is between 124mAh/g ~ 186mAh/g which fits the research result well. Furthermore, a newly synthesized CNT filled with tin was characterized. Upon the electrochemical testing, it showed a better reversible capacity and coulomb efficiency.更多还原