| 摘要 |
PURPOSE: To provide tricobalt tetroxide with high pulverizing capability and a BET mean particle size of 0.1-0.5μm at low cost, used as a positive electrode material of a lithium secondary battery. CONSTITUTION: Cobalt sulfate aqueous solution is reacted with an aqueous solution containing bicarbonate ions equivalent or mote to cobalt ions contained in the cobalt sulfate aqueous solution. After reaction, ammonium is added until pH becomes 7.0-8.5, and they are stirred for one hour or more, obtained precipitation is separated from the solution, washed, dried, then baked under coexistence of oxygen such as in the air at 600-700 deg.C. |
