Study on the mechanism of the formation of carbon nanotubes from DPG（Dissolution Precipitation Graphite） process in the system of liquid phase
| Autor: | Fu-Sheng Li, 李富生 |
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| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 The purpose in this research is to analyze the micro-structure and mechanism of the carbon nanotubes in the system of liquid surrounding. Our research focused on using DPG (Dissolution Precipitation Graphite) process to produce artificial graphite that dispersed some carbon nanotubes and nano-materials. Furthermore, the boron-triggering mechano-chemical effect, change of microstructure, and hydrochloric acid treatment, are the reasons inducing the formation of the carbon nanotubes. Also, the four-points-probe instrument was used in this research to determine electric conductivity, expecting to discuss the relationship with impedance and the number and the orientation of carbon nanotubes formatted by the different concentrations of chloride ion. On the other hand, the trend of the decreasing of graphitization degree as increasing chloride ion concentration is observed, which is analyzed by XRD with Rietveld refinement method. It implies that the carbon nanotubes formation has a strong relationship to chloride ion doping. This result could also prove that the mechano-chemical effect and HCl treatment are the driving forces of carbon nanotubes formation. These are the critical keys of the new unusual process. Then, on the application of the anodic material of the lithium secondary battery, the method to control the forming of SEI, reduce the first irreversible capacity, and improve the battery efficiency was also be find out by pre-treating powder with different concentration of chloride ion. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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