| Summary: | 碩士 === 國立雲林科技大學 === 化學工程與材料工程系 === 105 === This experiment is divided into carbon material and carbon material modified part, the former process part adopts the chemical vapor deposition method to simultaneously grow the carbon nanotubes / graphene composites, no additional sputtering catalyst or use of adhesive. After the process for the porous structure of cobalt oxide modified carbon material part, the after process is preparation of the porous structure precursor, cobalt hydroxide, which prepared by the electrochemical cathodic deposition, and then through the high temperature furnace in the atmosphere for oxidation heat treatment, and retain its porous structure of the type and form a porous structure of cobalt oxide, and decorated to carbon nanotubes / graphene composites to form porous structure Co3O4 / Carbon nanotubes / graphene composites used in lithium-ion battery anode. Furthermore, the XPS and Raman were used to analyze the functional front of the cobalt oxide, in addition, the surface morphology of the electrode was changed by SEM, and the roughness of the surface was measured by AFM, and then the suitable modification parameters were found to fabricate into coin-cell for testing its electrochemical performance. The results indicate deposition current 5mA and deposition time 600s by cathodic deposition process, the porous cobalt oxide/carbon nanotubes/graphene composites electrodes with the best roughness and utilization. By electrochemical analysis, the highest 2nd discharge specific capacity 1316.60 mAh/g was found at deposition time 15min , deposition current 5mA. After 20 cycles, it still has good cycle performance.
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