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標題: | 矽烷合成SiOC在鋰電池負極材料之研究 Synthesis of SiOC by Alkoxysilane for Lithium-Ion Battery Anode Materials |
作者: | 黃新哲 Hsin-Che Huang |
指導教授: | 藍崇文 Chung-Wen Lan |
關鍵字: | 矽烷,甲基三甲氧基矽烷,球形SiOC,鋰離子電池,負極材料, silane,methyltrimethoxysilane,spherical SiOC,lithium-ion battery,anode material, |
出版年 : | 2022 |
學位: | 碩士 |
摘要: | 隨著電動車的發展,鋰電池市場也迎來極大的成長。矽具有4200mAh/g的高理論比電容,被認為是下一代鋰離子電池的重要材料。但矽陽極的大體積膨脹阻礙了矽在鋰離子電池中的商業利用。SiOC(silicon oxycarbide)作為Si的替代方案,更能承受鋰電池鋰化及脫鋰過程的膨脹跟收縮。因此,吾人欲研究以成本低的矽烷來合成SiOC。吾人先嘗試了各種不同的裝置,最後決定以批次反應作為實驗的方法。接著探討不同反應溫度的影響,成功在反應溫度30°C時,得到大於90%的高產率。再藉著調整甲基三甲氧基矽烷、氨水濃度的比例,成功在矽烷濃度提升至0.59M時,也可得到均勻分散的粒子。最後再透過摻3-氨丙基三甲氧基矽烷,成功用二甲基二甲氧基矽烷降低產物的O/Si比,並提升電池的循環性。此製程的優勢在於,作為原料的甲基三甲氧基矽烷相當便宜,且實驗可在常溫、常壓下簡單操作。而反應的高產率、SiOC的高容量、良好循環性有助於其未來在鋰電池市場的商業利用。 Silicon is important for lithium-ion batteries because of its high theoretical capacity. But the large volume expansion of silicon anodes hinders the commercial utilization. As an alternative, SiOC (silicon oxycarbide) can better withstand the expansion of Li-ion batteries during lithiation. In this study, we want to study the synthesis of SiOC by low-cost silane.First, we tried different setups and finally decided to use batch reaction. Then, we discussed the influence of reaction temperatures. The yield was more than 90% at 30°C. Next, by adjusting the ratio of methyltrimethoxysilane and NH4OH, we could get monodispersed particles when the silane concentration was increased. Finally, we successfully reduce O/Si ratio of the product and improve the cycle performance of the battery by adding 3-aminopropyltrimethoxysilane and dimethyldimethoxysilane. The advantage of this process is that methyltrimethoxysilane is quite cheap, and the experiment can be easily operated at normal temperature and pressure. The high yield of the reaction, the high capacity and good cyclability of SiOC will promote its commercial utilization in the lithium battery market in the future. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/91918 |
DOI: | 10.6342/NTU202203094 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 化學工程學系 |
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