CPC H01M 4/525 (2013.01) [C01G 53/54 (2013.01); H01M 4/505 (2013.01); C01P 2002/32 (2013.01); C01P 2004/03 (2013.01); C01P 2004/51 (2013.01); C01P 2004/54 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] | 10 Claims |
1. A positive-electrode active material for a non-aqueous electrolyte secondary battery, comprising:
lithium transition metal composite oxide particles having an average particle diameter based on SEM observation DSEM that is from 0.5 μm to less than 3 μm, and a ratio D50/DSEM that is from 1.6 to 2.1 where D50 is a particle diameter corresponding to 50% in its volume-based cumulative particle size distribution,
wherein the lithium transition metal composite oxide particles have a spinel structure based on nickel and manganese,
wherein the lithium transition metal composite oxide particles contain lithium transition metal composite oxide particles onto surfaces of which a substance containing niobium is adhered,
wherein the lithium transition metal composite oxide particles have a ratio D95/D5 that is from 2.5 to 3.8, and
wherein the lithium transition metal composite oxide particles have a ratio D90/D10 that is from 2.0 to 2.5.
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