| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a positive electrode active material for a nonaqueous electrolyte secondary battery, which can be manufactured in an industrial production process stably and which has a high initial discharge capacity and a low resistance. <P>SOLUTION: A method of manufacturing a positive electrode active material includes the steps of: crushing NiCoMn compound in a solvent while mixing until the average particle diameter becomes 0.1 to 1 μm; spray-drying a slurry resulting from the preceding step to obtain a mixture raw material of NiCoMn compound having an average particle diameter of 2-6 μm; performing a heat treatment on the mixture raw material at a temperature of 300-800°C; mixing the resultant mixture raw material with Li compound, followed by baking to obtain LiNiCoMn composite oxide; and rinsing with water and vacuum-drying the LiNiCoMn composite oxide. Thus, LiNiCoMn composite oxide of hexagonal system, having a layer structure and represented by a general formula of Li<SB POS="POST">w</SB>Ni<SB POS="POST">x</SB>Co<SB POS="POST">y</SB>Mn<SB POS="POST">z</SB>O<SB POS="POST">2</SB>(where 0.95≥w≥1.30, x=z, x+y+z=1, 0.3≥x≥0.45, 0.1≥y≥0.4 and 0.3≥z≥0.45), can be obtained. As for the LiNiCoMn composite oxide, an occupancy rate of metal ions other than Li at the 3a site is 5% or smaller, and an occupancy rate of metal ions other than NiCoMn at the 3b site is 10% or smaller, and the average particle diameter is 2-6 μm. <P>COPYRIGHT: (C)2012,JPO&INPIT |
