鋰離子電池負極Sn/C複合材料之製備

Preparation of Sn/C composite anode materials for lithium ion batteries

張晏銘(Yan-Ming Zhang)

指導教授 ： 吳溪煌

大同大學/工程學院/材料工程學系所/碩士(2008年)

摘要

披覆無次序碳的天然石墨與SnCl4是在水溶液裡藉由NaBH4 還原法製備Sn/C 複合材料。以XRD及Raman分析酸洗對已披覆無次序碳天然石墨表面的不完美結構及表面官能基的影響。以XRD，TGA及SEM分析Sn在天然石墨上之沉積相及沉積量，以循環充放電測試探討天然石墨在酸洗前後及沉積Sn後之電化學特性。結果顯示藉由Sn4+ 能與披覆無次序碳的天然石墨表面含氧官能基反應並且再添加
入1,10-phenanthroline 後，於已披覆無次序碳的天然石墨上能成功地沉積奈米Sn粒子。且隨著Sn4+/NaBH4莫爾比增加，Sn沉積的量愈多。在循環特性上，Sn4+/NaBH4 莫爾比為1/32時的效果較其餘的好。

關鍵字

天然石墨 ； 酸洗 ； NaBH4 ； 錫

並列摘要

Sn/C composites were prepared via a NaBH4 reduction method with carbon-coated natural graphite and SnCl4 in aqueous solution. Effects of acid washing on the disorder ness and the surface function groups on the surface of carbon-coated natural graphite surface were studied with XRD and Raman spectroscopy. The physical properties of the prepared Sn/C composites were investigated with XRD, TGA and SEM. The electrochemical properties of the prepared samples before and after Sn deposition were estimated with capacity retention study. The results demonstrated that nano-Sn particle deposited on carbon-coated natural graphite can be prepared successfully by having Sn4+ react with hydroxy group on the surface of carbon-coated natural graphite before adding 1,10-phenanthroline. The amount of Sn deposition increases with increasing ratio of Sn4+/NaBH4 addition. The sample prepared with Sn4+/NaBH4 molar ratio of 1/32 shows the most promising cycling performance among the prepared samples.

並列關鍵字

natural graphite ； acid-washing ； NaBH4 ； Sn

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