| abstract |
Metal oxide nanoparticles of 100 nm or less provide a composite having high dispersion supported on carbon. The composite powder, in which the precursor of the metal oxide nanoparticles is highly dispersed on carbon, is subjected to rapid heat treatment in a nitrogen atmosphere, whereby the crystallization of the metal oxide is advanced, and the metal oxide nanoparticles are highly dispersed on carbon. The precursor of the metal oxide nanoparticles and the carbon nanoparticles carrying the same are produced by a mechanochemical reaction which provides shear stress and centrifugal force to the reactants in the reactor to be swiveled. It is preferable to heat the rapid heat treatment in the nitrogen atmosphere at 400 ° C to 1000 ° C. By further pulverizing the heated composite, the aggregation is eliminated, and the dispersion degree of the metal oxide nanoparticles is made more uniform. As the metal oxide, manganese oxide, lithium iron phosphate, lithium titanate or the like can be used. As carbon, carbon nanofibers or Ketjen black can be used. |