COMPOSITE OF MANGANESE OXIDE NANOPARTICLE AND CARBON, METHOD FOR MANUFACTURING THE SAME, AND ELECTRODE AND ELECTROCHEMICAL ELEMENT USING THE COMPOSITE

摘要

PROBLEM TO BE SOLVED: To provide a composite in which manganese oxide nanoparticles in diameter of 100 nm or less are supported on carbon in a highly dispersed manner.SOLUTION: Composite powder having a precursor of manganese oxide nanoparticles supported on carbon in a highly dispersed manner is treated by rapid heating in a nitrogen atmosphere to progress crystallization of metal oxide, whereby manganese oxide nanoparticles are supported on carbon in a highly dispersed manner. The precursor of manganese oxide nanoparticles and the carbon nanoparticles supporting thereof are prepared by a mechanochemical reaction which imparts shear stress and centrifugal force to the reactant in a revolving reactor. It is desirable that the rapid heating treatment in a nitrogen atmosphere be carried out at 250°C to 600°C. The heated composite is further pulverized to eliminate the aggregation thereof, thereby making the dispersity of manganese oxide nanoparticles more uniform. Carbon nanofiber or Ketjenblack may be used as carbon.