US 12,315,909 B2
Positive electrode active material for lithium ion secondary battery, method for producing the same, and lithium ion secondary battery
Tomoko Nakayama, Niihama (JP); and Haruki Kaneda, Niihama (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 17/622,401
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Jun. 19, 2020, PCT No. PCT/JP2020/024253
§ 371(c)(1), (2) Date Dec. 23, 2021,
PCT Pub. No. WO2020/262264, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-117934 (JP), filed on Jun. 25, 2019.
Prior Publication US 2022/0359860 A1, Nov. 10, 2022
Int. Cl. H01M 4/131 (2010.01); C01G 53/00 (2025.01); C01G 53/42 (2025.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/131 (2013.01) [C01G 53/42 (2013.01); H01M 4/0471 (2013.01); H01M 4/364 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2002/50 (2013.01); C01P 2004/03 (2013.01); C01P 2004/51 (2013.01); C01P 2004/62 (2013.01); C01P 2004/64 (2013.01); C01P 2006/10 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A positive electrode active material for a lithium ion secondary battery, the positive electrode active material having a mole ratio among lithium (Li), nickel (Ni), cobalt (Co), an element M, and tungsten (W) of Li:Ni:Co:M:W=a:(1−x−y):x:y:z (in which 0≤x≤0.35, 0≤y≤0.35, 0.005≤z≤0.030, 0.97≤a≤1.25, and the element M represents at least one element selected from the group consisting of Mn, V, Mg, Mo, Nb, Ti, and Al), wherein
the positive electrode active material comprises: a lithium-metal composite oxide which comprises primary particles and secondary particles formed of a plurality of the primary particles which are aggregated together; and a compound containing lithium and tungsten present on surfaces of the primary particles,
an amount of tungsten contained in the compound containing lithium and tungsten is 0.5 atom % or more and 3.0 atom % or less in terms of a ratio of a number of atoms of W with respect to a total number of atoms of Ni, Co, and the element M, and
a conductivity when the positive electrode active material is compressed to 4.0 g/cm3 as determined by powder resistance measurement is 6×10−3 S/cm or less.