| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 104 === In this study, zinc and nickel hexacyanoferrates (ZnHCF and NiHCF) were synthesized by co-precipitation method. The carbon/iron alloy composites were prepared by direct pyrolysis of ZnHCF and NiHCF precursors at various temperatures under argon atmosphere. The nanosphere and nanotube structures were obtained at 550C and 750C, respectively. This method allowed for the formation of carbon materials with encapsulated iron alloy nanoparticles. The composite nanoparticles could be deposited on stainless steel substrate using electrophoretic deposition as the anode for lithium-ion batteries. Surface morphology and internal microstructure of the composite materials were characterized by scanning electron microscope and transmission electron microscopy, respectively. Crystal structure and content of the composite materials were analyzed by X-ray diffraction analyzer and thermal gravimetric analysis, respectively. The electrochemical properties of the composite electrodes were measured by cyclic voltammetry , galvanostatic charge/discharge, and cycle-life test. The results showed that the carbon/iron-zinc alloy electrode after reflux acid treatment in 13 M HNO3 for 1 h exhibited a high reversible specific capacity of 1055.8 mAh/g in the first charge/discharge cycle at 0.1 C rate, while its specific capacity decreased slightly to 663.3 mAh/g at 10 C rate. After galvanostatic charge/discharge for 3000 cycles, specific capacity of carbon/iron-zinc alloy electrode remained almost unchanged, showing good electrochemical stability.
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