| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系 === 98 === In this study, it is mainly because the theoretical capacity of tin dioxide density is more than graphite, combined with good circulation of carbon graphite materials to prepare nano SnO2/C composites, with good electrochemical properties compared with tin dioxide. In this experiment, lithium tin-carbon composite ion battery anode materials were synthesized by modified Pechini techniques, which use anhydrous alcohol or deionized water as the solvent, citric acid - cellulose and the metal ions as coordination to form complexes, then generate polyester resin and add the carbon material. The reaction mechanism and micro-structural properties were analyzed by FTIR, TGA / DTA, XRD, TEM and SEM.
The SnO2 powder crystallized at 400 ℃, while the well crystalline ceramic powder was obtained at 500 ℃ by Sol-gel . The chemical changes and thermal performance were observed by TGA/DTA and FTIR. It is found that the bond between carboxylic acid and metal ions gradually convert bridging ligand sequestration into double teeth at 400 ℃, while flattened weight loss temperature at about 700 ℃.
The crystal size is an important factor on the electrochemical properties for preparing nano SnO2 electrode material. The 20nm of crystal size was obtained at 600 ℃ for the 3.0 ration between the citric acid and metal ion using deionized water as the solvent.
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