Park No-Kuk, Jeong Yong Han, Lee Tae Jin, Lee Seung Hyun, Lee Seung Hun
J Nanosci Nanotechnol. 2018 Oct 1;18(10):7275-7280. doi: 10.1166/jnn.2018.15497.
Macro-porous silicon, which can be used as an anode material for lithium-ion batteries (LIBs), was synthesized by the reduction of macro-porous silica, which had been prepared by template method, using aluminum metal fine powder as the reducing agent. A TEOS-PMMA (tetra-ethyl-ortho-silicate, poly-methyl-meta-acrylate) mixture solution was used as a precursor to prepare the macro-porous silica. PMMA was synthesized as spherical type nano-beads using a suspension polymerization method. Silica gel was formulated by the hydrolysis of TEOS and macro-sized pores were formed in the silica particles by the decomposition of PMMA during the thermal treatment at high temperatures. The prepared macro-porous silica was mixed with aluminum fine powder in methyl alcohol, and then treated at high temperature under argon-gas conditions for the reduction of silica. The silica/aluminum ratio was controlled to 0.5, 0.75, 1.0, 1.5 and 2.0, and the reducing temperature was controlled in the range, 550-700 °C. The formation of silicon was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy.
可用作锂离子电池（LIBs）阳极材料的大孔硅，是通过以铝金属细粉为还原剂，还原采用模板法制备的大孔二氧化硅而合成的。使用TEOS-PMMA（正硅酸乙酯、聚甲基丙烯酸甲酯）混合溶液作为前驱体来制备大孔二氧化硅。采用悬浮聚合法将PMMA合成球形纳米珠。通过TEOS的水解制备硅胶，并在高温热处理过程中通过PMMA的分解在二氧化硅颗粒中形成大尺寸孔隙。将制备好的大孔二氧化硅与铝细粉在甲醇中混合，然后在氩气条件下进行高温处理以还原二氧化硅。将二氧化硅/铝的比例控制为0.5、0.75、1.0、1.5和2.0，并将还原温度控制在550 - 700℃范围内。通过X射线衍射和X射线光电子能谱确认了硅的形成。
