陳立業2006-07-252018-06-282006-07-252018-06-282005http://ntur.lib.ntu.edu.tw//handle/246246/12487本計畫採用Co、Zn 元素對奈米Ni(OH)2 材料進行摻雜改性 （Doping modification），以進一步提高其電化學導電度與抑制其膨脹。並利用行星式球磨機球磨奈米結構粉末，對結構作改質。由粒徑分析、X-ray 繞射、掃瞄式電子顯微鏡和穿透式電子顯微鏡對摻雜型奈米Ni(OH)2 材料的結構作研究，發現晶粒及粒徑均有減小的情況，而這對粉末電性是有益的。另外，改變Co 添加物的含量，以進一步提高鎳氫電池鎳正極之電化學導電度。由X-ray 繞射和掃瞄式電子顯微鏡分析結果顯示，發現隨Co 含量增加，活性物質面積增加。由充放電實驗及交流阻抗分析可以發現Co 含量愈高，Ni(OH)2正極之電性能亦提高。最後，將摻雜不同含量的Co 及3%Zn 元素的奈米結構Ni(OH)2 材料與商用粉末依適當比例混和，以進一步降低其接觸電阻，發現了8wt%奈米結構Ni(OH)2 粉末為其最佳配比。而且由實驗結果可知電極的電性能隨鈷含量增加而提升，本實驗以添加6wt%Co 之電極，電容量為265.2mAh/g，活性物質利用率為91.8%，為最大值。，因此增加Ni(OH)2 正極之導電度，進而提昇充電效率。以這樣的方法生產成本較低，商業化較易。The positive electrode active materials of Ni(OH)2 powders for alkaline Ni-MH battery have been fabricated by a chemical precipitation method. The characteristic properties of Ni(OH)2 powders were analyzed by the XRD and SEM. The electrochemical properties of Ni(OH)2 powders were also analyzed by the galvanostatic charge-discharge test and AC impedance spectroscopy. We tried to dope 2wt%cobalt and 4wt%zinc into the nanostructured β-Ni(OH)2 by co-precipitation in order to have better conductivity and swelling properties. A method of planetary ball mill was used to modify the physical and electrochemical properties of the co-precipitated powder. The structural changes, which detected by particle size distribution, XRD, SEM and TEM apparatus indicated the particle size and crystallite size were reduced. Small crystallite size and particle size are good for their electrochemical properties. The result of discharge curve and charge-discharge voltage showed that the improvement of the performance of nanostructured β-Ni(OH)2 after ball mill. In general, it must be noted that a nickel hydroxide electrode with the addition of cobalt hydroxide shows much better electrochemical properties. It was observed that the electrochemical properties of nickel cathodes depend on the contents of cobalt additive. It was indicated that the Ni-MH batteries have good performance of charge and discharge characteristics.application/pdf1784321 bytesapplication/pdfzh-TW國立臺灣大學材料科學與工程學系暨研究所氫氧化鎳化學共沉澱法鈷添加物Ni(OH)2chemical precipitation methodcobalt additivereporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/12487/1/932216E002004.pdf