US 12,087,943 B2
Precursor of positive electrode active material for nonaqueous electrolyte secondary batteries and production method thereof and positive electrode active material for nonaqueous electrolyte secondary batteries and production method thereof
Taira Aida, Niihama (JP); and Hiroyuki Toya, Niihama (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Filed on Jul. 12, 2023, as Appl. No. 18/220,905.
Application 18/220,905 is a division of application No. 16/509,941, filed on Jul. 12, 2019, granted, now 11,742,479.
Application 16/509,941 is a continuation of application No. 15/129,159, granted, now 10,601,036, issued on Mar. 24, 2020, previously published as PCT/JP2015/057229, filed on Mar. 12, 2015.
Claims priority of application No. 2014-069590 (JP), filed on Mar. 28, 2014.
Prior Publication US 2023/0369580 A1, Nov. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/505 (2010.01); C01G 53/00 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/505 (2013.01) [C01G 53/50 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A positive electrode active material for nonaqueous electrolyte secondary batteries, consisting of
lithium-nickel-manganese composite oxide particles represented by the general formula (2), wherein
the positive electrode active material has a sulfate group content of 0.4% by mass or less and a sodium content of 0.035% by mass or less,
the lithium-nickel-manganese composite oxide particles have a hollow consisting of a central space and a shell outside the hollow or pores are distributed throughout the particles, and wherein a porosity of the lithium-nickel-manganese composite oxide particles is from 49 to 58%,
LiaNixCoyMnzMtO2  general formula (2)
where 0.95≤a≤1.20; 0.2≤x≤0.8; 0≤y<0.3; 0.07<z≤0.8; 0≤t≤0.1; x+y+z+t=1; and M is at least one element selected from Mg, Ca, Ba, Sr, Al, Ti, V, Cr, Zr, Mo, Hf, Ta, and W.