POSITIVE ELECTRODE MATERIALS FOR LITHIUM SECONDARY BATTERY USING SPHERICAL COBALT HYDROXIDE AND MANUFACTURING METHOD THEREOF

摘要

PURPOSE: A manufacturing method of a positive electrode material manufactures a positive electrode material with improved lifetime and having a particle size of 20 micron or greater in order to obtain high energy density. CONSTITUTION: A manufacturing method of a positive electrode material comprises a step of manufacturing spherical cobalt hydroxide by coprecipitating an aqueous solution including a cobalt raw material, a hydroxide raw material, a hetero metal raw material for substitution, and an amine raw material (S10); and a step of manufacturing cobalt oxide substituted with heterometal by heat-treating the cobalt hydroxide. In manufacturing cobalt hydroxide, the cobalt hydroxide has the composition ratio of Co_(1-x)M_x(OH)_2 where 0.00<=x<=0.10 and M is Al, Mg, or Ti. The average granularity of the cobalt hydroxide is 15-30 micron. [Reference numerals] (AA) Start; (BB) End; (S10) Manufacturing high density spherical cobalt hydroxide by coprecipitating an aqueous solution including a cobalt raw material, a hydroxide raw material, a hetero metal raw material for substitution, and an amine raw material; (S20) Producing high density cobalt oxide substituted with heterometal by heat-treating the cobalt hydroxide at 500-800°C; (S30) Producing cobalt acid lithium, material for anode, by mixing cobalt oxide with Li_2CO_3 and Li_2CO_3 at 900-1100°C; (S40) Confricating by pulverizing heat treated anode material