| abstract |
This positive electrode active material for a secondary cell having a non-aqueous electrolyte includes a lithium complex oxide A that contains W and Ni, and a lithium complex oxide B that contains Ni but not W. In the lithium complex oxide A, the proportion of Ni relative to the total number of moles of metal elements excluding lithium is 30-60 mol%, the 50% grain diameter D50 is 2-6 μm, the 10% grain diameter D10 is 1.0 μm or greater, and the 90% grain diameter D90 is 6.8 μm or less. In the lithium complex oxide B, the proportion of Ni relative to the total number of moles of metal elements excluding lithium is 50-95 mol%, the 50% grain diameter D50 is 10 to 22 μm, the 10% grain diameter D10 is 7.0 μm or greater, and the 90% grain diameter D90 is 22.5 μm or less. The mass ratio of the lithium complex oxide A relative to the lithium complex oxide B is 1:1 to 5.7:1. |