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研究了正八面体氧化钴颗粒在超临界二氧化碳体系中的合成过程。在密闭的不锈钢高压反应釜中,1.0g乙酸钴和12.0g干冰在450℃下,反应12h后合成粒径大约10μm的正八面体氧化钴颗粒。通过XRD、XPS、TEM、SEM以及拉曼光谱的分析,氧化钴颗粒是由八个{111}面包裹着的正八面体单晶组成。条件实验显示,超临界二氧化碳体系是正八面体氧化钴颗粒合成的充分条件。其生长机理可能是:乙酸钴在超临界二氧化碳体系中的热分解;氧化钴的结晶和定向缓慢生长。在性能方面,初步研究了正八面体氧化钴颗粒在作为锂离子电池电极材料的应用。
The synthesis of n-octahedral cobalt oxide particles in supercritical carbon dioxide was studied. In a sealed stainless steel autoclave, 1.0g of cobalt acetate and 12.0g of dry ice were reacted at 450 ° C for 12h to synthesize n-octahedral cobalt oxide particles with a particle size of about 10μm. By XRD, XPS, TEM, SEM and Raman spectroscopy, cobalt oxide particles are composed of eight {111} noodles wrapped with octahedron single crystal. Conditional experiments show that the supercritical carbon dioxide system is a sufficient condition for the synthesis of octahedral cobalt oxide particles. The growth mechanism may be: the thermal decomposition of cobalt acetate in supercritical carbon dioxide system; the slow growth of cobalt oxide crystallization and orientation. In terms of performance, the preliminary study of the octahedral cobalt oxide particles as lithium ion battery electrode material application.