▎ 摘　　要

NOVELTY - Manganese oxide-nanocarbon composite particles comprise nanocarbon particles and manganese oxide, where the content of manganese is 3-70 mol.% with respect to the carbon atom in the nanocarbon particles, and the intensity ratio (G/D ratio) of the G band and the D band in the Raman spectrum is 2-100. USE - The composite particles are useful in electrode material for electric double layer capacitor (all claimed). ADVANTAGE - The composite particles have excellent capacitance and charge/discharge characteristics. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a manganese oxide-nanocarbon composite particle dispersion liquid, prepared by dispersing the manganese oxide-nanocarbon composite particles in a solvent chosen from water and/or water-soluble solvent; (2) a method for producing the manganese oxide-nanocarbon composite particle dispersion, involving (A) adding/mixing potassium permanganate or its aqueous solution to a nanocarbon particle dispersion liquid in which nanocarbon particles are dispersed in one or more first solvent chosen from water and a water-soluble solvent, (B) adjusting the pH of the obtained dispersion to 2-9 with a pH adjuster, and (C) heating the obtained dispersion to obtain the product, (or) (D) recovering nanocarbon particles from a nanocarbon particle dispersion liquid in which nanocarbon particles are dispersed in one or more first solvent chosen from water and a water-soluble solvent, (E) adding the nanocarbon particles obtained in step (D) to one or more second solvents selected from water and a water-soluble solvent and dispersing, (F) adding/mixing potassium permanganate or its aqueous solution to the dispersion obtained in step (E), (G) adjusting the pH of the dispersion obtained in step (F) to 2-9 with a pH adjuster, and (H) heating the dispersion obtained in step (G) to obtain the product; and (3) a method for producing manganese oxide-nanocarbon composite particles, involving (I) recovering solid particles by filtering or centrifuging the manganese oxide-nanocarbon composite particle dispersion obtained by the above method, (J) washing the solid particles obtained in step (I) with water or alcohol, and (K) drying the manganese oxide-nanocarbon composite particles obtained in step (J).