石墨烯
材料科学
氧化物
纳米复合材料
透射电子显微镜
化学工程
阳极
石墨
氧化石墨烯纸
锂离子电池
氧化石墨
锂(药物)
无定形固体
扫描电子显微镜
电池(电)
纳米技术
复合材料
冶金
结晶学
电极
化学
功率(物理)
物理化学
内分泌学
工程类
物理
医学
量子力学
作者
Masahiro Kawasaki,Viratchara Laokawee,Thapanee Sarakonsri,Takashi Hashizume,Makoto Shiojiri
摘要
We synthesized SiSn/(reduced graphene oxide (rGO)) nanocomposite powder for a Li-ion battery material and characterized the structure by transmission electron microscopy (TEM) and analytical scanning transmission electron microscopy (STEM). Graphene oxide was prepared by Hummers method. The graphene oxide powder processed by heat treatment was added together with Si powder into a solution of SnCl2⋅ 2(H2O) dissolved in N2 bubbled ethylene glycol, and the solution was reacted with NaBH4. The product had a nominal atomic ratio of Si: Sn: C = 14: 3.5: 100. High-resolution TEM/STEM analysis revealed that the powder consisted of crystalline particles of Sn, Si, and SiO as well as thin reduced graphene oxide (rGO) lamellae of amorphous-like graphite with distorted lattices that were often found in areas as local as a few nm2. The aggregated Si and SiO particles grew up to several hundred nm across. Sn particles grew as large as a few tens of nm while those as small as a few nm were scattered on the (0001) rGO surface with some epitaxial relations. Si, SiO, and Sn particles were found hanging on at the edges of the rGO lamellae. An electrochemical test was performed for this nanocomposite powder. The result suggested that the SiSn/rGO powder would be a promising anode material for lithium-ion batteries with high capacity.
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