CPC H01M 4/525 (2013.01) [H01M 4/364 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] | 3 Claims |
1. A positive electrode active material for a non-aqueous electrolyte secondary battery, including Ni-containing lithium composite oxides a and b, wherein
an average primary particle size of the Ni-containing lithium composite oxide a is 1 μm or more and larger than an average primary particle size of the Ni-containing lithium composite oxide b,
an average secondary particle size of the Ni-containing lithium composite oxide a is 2 μm to 6 μm,
the Ni-containing lithium composite oxide b has an average primary particle size of 0.05 μm or more and an average secondary particle size of 10 μm to 20 μm,
the Ni-containing lithium composite oxide a includes Mn, includes at least either one of B and Al, contains 55 mol % or more of Ni based on the total number of moles of the metal elements except for Li, and has a crystallite size of 100 nm to 200 nm,
the Ni-containing lithium composite oxide b includes Mn, is free of B and Al or has smaller contents of B and Al than those in the Ni-containing lithium composite oxide a, contains 55 mol % or more of Ni based on the total number of moles of the metal elements except for Li, and has a crystallite size of 100 nm to 200 nm, and
a mass ratio between the Ni-containing lithium composite oxide a and the Ni-containing lithium composite oxide b is 5:95 to 55:45.
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