Process for producing composite material of metal oxide with conductive carbon

A method for producing a composite material of a metal oxide and conductive carbon, comprising:

• a preparation step to introduce into a rotatable reactor a reaction solution obtained by preparing a base solution comprising water, at least one compound with a transition metal selected from a group consisting of Mn, Fe, Co and Ni which is dissolved in the water, and conductive carbon powder and then adding to the base solution a pH adjuster for adjusting a pH of the reaction solution in a range of 9 to 11;
• a supporting step to add shear stress and centrifugal force to the reaction solution by rotating the reactor so as to form a core of a hydroxide of the transition metal, disperse the core of a hydroxide of the transition metal obtained and the conductive carbon powder, and simultaneously support a particle grown from the core of the hydroxide of the transition metal by the conductive carbon powder;
• and
• a heat treatment step to heat a mixture obtained by mixing the conductive carbon powder supporting the particle grown from the core of the hydroxide of the transition metal with at least one compound with a typical metal selected from a group consisting of elements in groups 1 and 2 of the periodic table so as to react the particle grown from the core of the hydroxide of the transition metal supported by the conductive carbon powder and the compound of a typical metal and transform to a nanoparticle of a compound oxide,
• wherein the compound of a typical metal is lithium hydroxide, and the nanoparticle of a compound oxide is selected from a group consisting of a nanoparticle of LiMO2 having a layered rock salt structure or a layered Li2MnO3-LiMO2 solid solution, wherein M in the formulas is Mn, Fe, Co, Ni or a combination thereof, and
• hydrothermal treatment is given after heat-treatment in an atmosphere containing oxygen at a temperature of 200 to 300° C. in the heat treatment step.