鋰鈷氧化合物奈米纖維之合成及特性研究

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題名:
鋰鈷氧化合物奈米纖維之合成及特性研究
著者: 江怡芳; Chiang, Yi-fang
傅耀賢; none; 材料科學系碩士班
主題: 放電紡絲; electrospinning
描述: 鋰離子二次電池主要由正負兩極和電解液組成。負極材料大多為碳材；正極材料種類很多，目前常見的正極材料有：LiCoO2，LiNiO2，LiMn2O4。其中以六方晶系α-NaFeO2-type結構存在的LiCoO2為最穩定的正極材料，因為在長時間的充放電之後，LiCoO2不會因為Li+嵌入嵌出而破壞其結構，且其有高電容量、良好循環壽命，因此為商業上最廣泛使用的正極材料。由於鋰離子電池的充放電效率是受在LiCoO2內Li+的固態擴散(solid-state diffuse)距離所影響，因此將LiCoO2材料製成纖維狀，將可縮短其擴散距離，使鋰離子電池有更快速的充放電能量。本研究以醋酸金屬鹽類為前驅物，結合新穎技術放電紡絲法(electrospinning)合成LiCoO2的奈米纖維，改變放電紡絲的電壓、纖維燒結溫度、前驅物黏度，經由SEM、XRD、EDS的量測，探討在不同條件下，找到放電紡絲的最佳參數，得到更細的LiCoO2奈米纖維，更希望能得到無雜質的LiCoO2纖維、且在低溫下即有良好的結晶性。
The lithium ion secondary battery is mainly composed of the cathode, the node, and the electrolyte. The negative material mostly is the carbon material. There are a lot of kinds of positive electrode materials and the common positive electrode materials includes LiCoO2, LiNiO2, and LiMn2O4. Especially the LiCoO2 which exists as the hexagonal α-NaFeO2-type structure is the most stable positive electrode material. It is because the structure of the LiCoO2 will not be destroyed when the Li+ deintercalates and reintercalates after a long period of cycling. As a result the LiCoO2 is the most commercially used material for the lithium batteries due to its high electric capacity and excellent cycle life. Because the charging and discharging efficiency of lithium ion battery is affected by solid-state diffuse distance of Li+ within LiCoO2, if we can make LiCoO2 as fibers, we can reduce its diffuse distance. Hence, it enables the lithium ion battery to have the faster charging and discharging energy.This research takes the acetic acid salt as the precursor and combines with novel technology (electrospinning) to synthesize the LiCoO2 nanofibers. We change the voltage, the annealing temperature, and the viscosity of precursor; by the ways of SEM, XRD, and EDS to discuss and find the optimum parameter of electrospinning under the dissimilar condition, to obtain the thinner LiCoO2 nanofibers. We hope to obtain the purer LiCoO2 nanofubers and have the good crystallinity under the low temperature.
碩士
建立日期: 2007
格式: 121 bytes
text/html
語言: 中文
識別號: http://nutnr.lib.nutn.edu.tw/handle/987654321/3549
資源來源: NUTN IR

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鋰鈷氧化合物奈米纖維之合成及特性研究

江怡芳; Chiang, Yi-fang 傅耀賢; none; 材料科學系碩士班 2007

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