COMPOSITE OF METAL OXIDE NANOPARTICLE AND CARBON, METHOD FOR PRODUCING THE SAME, ELECTRODE USING COMPOSITE, AND ELECTROCHEMICAL ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide an electrode having improved output characteristics and electric conductivity, and to provide an electrochemical element using the electrode.SOLUTION: Composite powder in which a precursor of metal oxide nanoparticles is supported on carbon in a highly dispersed manner is subjected to rapid heating treatment in a nitrogen atmosphere, thereby advancing crystallization of metal oxide and allowing the metal oxide nanoparticles to be supported on the carbon in a highly dispersed manner. The precursor of the metal oxide nanoparticles and the carbon nanoparticles, which support the precursor, are prepared by mechanochemical reaction for applying shear stress and centrifugal force to a reactant in a whirling reactor. Preferably, the rapid heating treatment in the nitrogen atmosphere is performed at 400 to 1,000°C. The heated composite is then crushed to eliminate aggregation of the heated composite, thereby homogenizing dispersion degree of the metal oxide nanoparticles. Manganese oxide, lithium iron phosphate, lithium titanate or the like may be used as the metal oxide. A carbon nanofiber or Ketjen black may be used as the carbon.SELECTED DRAWING: Figure 1