US 11,942,637 B2
Positive electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
Hidekazu Hiratsuka, Hyogo (JP); Hiroki Watanabe, Hyogo (JP); and Kazunori Donoue, Hyogo (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/417,240
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Nov. 25, 2019, PCT No. PCT/JP2019/045909
§ 371(c)(1), (2) Date Jun. 22, 2021,
PCT Pub. No. WO2020/137296, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-247348 (JP), filed on Dec. 28, 2018.
Prior Publication US 2022/0059836 A1, Feb. 24, 2022
Int. Cl. H01M 4/525 (2010.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01)
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
OG exemplary drawing
 
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.