US 12,347,848 B2
Method for preparing positive electrode active material for lithium secondary battery and positive electrode active material prepared thereby
Jun Ho Eom, Daejeon (KR); Dong Joon Ahn, Daejeon (KR); Chae Jin Lim, Daejeon (KR); Ji Hye Kim, Daejeon (KR); and Byoung Hun Jung, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/609,555
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jul. 20, 2020, PCT No. PCT/KR2020/009520
§ 371(c)(1), (2) Date Nov. 8, 2021,
PCT Pub. No. WO2021/015511, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 10-2019-0088560 (KR), filed on Jul. 22, 2019.
Prior Publication US 2022/0231281 A1, Jul. 21, 2022
Int. Cl. H01M 4/36 (2006.01); C01B 35/12 (2006.01); C01F 7/78 (2022.01); C01G 53/50 (2025.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/1315 (2010.01); H01M 4/1391 (2010.01); H01M 4/13915 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/58 (2010.01); H01M 4/62 (2006.01); H01M 10/052 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [C01G 53/50 (2013.01); H01M 4/04 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A positive electrode active material comprising:
a lithium transition metal oxide represented by Formula 2 below;
a first coating layer formed on a surface of the lithium transition metal oxide, wherein the first coating layer includes a coating element M1, wherein M1 includes aluminum (Al), or aluminum (Al) and sodium (Na); and
a second coating layer, wherein the second coating layer includes a coating element M2, wherein M2 includes boron (B),
wherein, when M1 includes Al, in a time-of-flight secondary ion mass analysis spectrum of the positive electrode active material, a ratio of the intensity of a peak detected at a mass exceeding 27 and a mass of 27.5 or less and the intensity of a peak of Al+ is 1:0.5 to 1:2,
Lia1Nib1Coc1Mnd1Ale1Xf1O2  [Formula 2]
wherein, in Formula 2,
1.03≤a1≤1.12, 0.7≤b1<1.0, 0<c1≤0.3, 0<d1≤0.3, 0<e1≤0.1, and 0≤f1≤0.1, and
X includes one or more selected from the group consisting of zirconium (Zr), B, tungsten (W), magnesium (Mg), cerium (Ce), hafnium (Hf), tantalum (Ta), titanium (Ti), strontium (Sr), barium (Ba), fluorine (F), phosphorus (P), sulfur (S), and lanthanum (La).