| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系 === 97 === Tin oxide/carbon nanotube nanocomposited materials have a great deal of interests as anodes for lithium rechargeable batteries, and provide the advantage over carbon or tin oxide system of being high capacity. Nano-sized tin oxide/carbon nanotube composited materials were obtained from the resins synthesized from the polymerized complex technique based on sol-gel method. Mixtures of stannic chloride were dissolved in the water and alcohol solution containing citric acid, and hydroxypropyl cellulose was used to produce the resin from polyesterification between citric acid and cellulose. The precursors were characterized by FTIR, DTA/TGA, XRD, Raman, TEM and SEM, and those mechanisms for the evolution of SnO2 powders in this process was proposed and discussed in the context of the microstructure. In this study, reaction temperature at 600 oC a rutile-structural SnO2 phase, the grain size of about 20 nm was synthesed and the ideal preparatory condition was obtained. The nanoparticles as anode material in lithium-ion batteries exhibit high lithium storage capacities. At 600 oC, the reversible capacities are more than 857 mAh /g on the 1st cycle. At 700 oC, the SnO2/CNT which showed the reversible capacities are more than 300 mAh /g , and capacity retention about 80% after 14th cycle.
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