US 12,080,877 B2
Positive electrode material for lithium secondary battery, and positive electrode for lithium secondary battery and lithium secondary battery including the same
Dong Hwi Kim, Daejeon (KR); Dong Hun Lee, Daejeon (KR); Wang Mo Jung, Daejeon (KR); Sung Bin Park, Daejeon (KR); and Gi Beom Han, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/047,884
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed May 22, 2019, PCT No. PCT/KR2019/006146
§ 371(c)(1), (2) Date Oct. 15, 2020,
PCT Pub. No. WO2019/225969, PCT Pub. Date Nov. 28, 2019.
Claims priority of application No. 10-2018-0058423 (KR), filed on May 23, 2018.
Prior Publication US 2021/0167365 A1, Jun. 3, 2021
Int. Cl. 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 4/364 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A positive electrode material for a lithium secondary battery, comprising:
a first positive electrode active material and a second positive electrode active material, wherein the first positive electrode active material and the second positive electrode active material are lithium composite transition metal oxides containing transition metals comprising nickel (Ni), cobalt (Co) and manganese (Mn),
an average particle size (D50) of the first positive electrode active material is larger than an average particle size (D50) of the second positive electrode active material,
a ratio (Li/Me)1 of a mole number of lithium with respect to a total mole number of transition metals of the first positive electrode active material is more than 1 to 1.5 or less,
a ratio (Li/Me)2 of a mole number of lithium (Li) with respect to a total mole number of transition metals of the second positive electrode active material is 0.9 to 1,
and the second positive electrode active material has a crystallite size of 180 nm or more, wherein the second positive electrode active material is a secondary particle formed by agglomerating primary particles, and an average particle size (D50) of the primary particle is 0.6 μm or more
and wherein the first positive electrode active material is represented by Formula 1 below:
Li1+p1[Ni1−(x1+y1+z1)Cox1Mny1Maz1]1−p1O2  [Formula 1]
Where Ma is at least one or more elements selected from the group consisting of Ba, Ca, Zr, Ti, Mg, Ta, Nb, Al, Cr and Mo, and
0<p1≤0.2, 0<x1≤0.5, 0<y1≤0.5, 0≤z1≤0.1, and 0<x1+y1+z1≤0.7.