US 11,742,480 B2
Positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery
Takao Kokubu, Osaka (JP); and Tomoki Tsuji, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 16/763,700
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Oct. 19, 2018, PCT No. PCT/JP2018/038914
§ 371(c)(1), (2) Date May 13, 2020,
PCT Pub. No. WO2019/097951, PCT Pub. Date May 23, 2019.
Claims priority of application No. 2017-222199 (JP), filed on Nov. 17, 2017.
Prior Publication US 2020/0373574 A1, Nov. 26, 2020
Int. Cl. H01M 4/525 (2010.01); H01M 4/505 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01); H01M 10/0569 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/505 (2013.01); H01M 4/623 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 10/0567 (2013.01); H01M 10/0569 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0034 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A positive electrode active material for a non-aqueous electrolyte secondary battery having composite oxide particles, the composite oxide particles including Ni, Co, and Li, also including at least one of the group consisting of Mn and Al, and having a proportion of Ni of 80 mol % or more based on the total number of moles of the metal elements except for Li, wherein
the composite oxide particles are composed of particles in an aggregated state and particles in a non-aggregated state,
wherein the particles in a non-aggregated state include not only particles in a state where composite oxide particles are separated completely one primary particle by one primary particle but also particles in a state where 2 to 19 primary particles are assembled,
the particles in an aggregated state refer to particles in a state where 20 or more primary particles of the composite oxide particles are assembled, and
the particles in a non-aggregated state have an average particle size of in the range of 2 μm to 20 μm, and the particles in an aggregated state have an average particle size of in the range of 5 μm to 20 μm; and
a content ratio between the particles in an aggregated state and the particles in a non-aggregated state is in the range of 5:95 to 50:50 in terms of mass ratio.