US 12,406,998 B2
Positive electrode slurry including oxalic acid, preparation method thereof, positive electrode for secondary battery, and secondary battery
Shanghao Piao, Daejeon (KR); Hye Lim Shim, Daejeon (KR); Wooha Kim, Daejeon (KR); and Sang Hoon Choy, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 16/965,685
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Dec. 4, 2019, PCT No. PCT/KR2019/017022
§ 371(c)(1), (2) Date Jul. 29, 2020,
PCT Pub. No. WO2020/138751, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 10-2018-0169827 (KR), filed on Dec. 26, 2018; and application No. 10-2019-0159241 (KR), filed on Dec. 3, 2019.
Prior Publication US 2021/0043938 A1, Feb. 11, 2021
Int. Cl. H01M 4/62 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 10/42 (2006.01)
CPC H01M 4/628 (2013.01) [H01M 4/04 (2013.01); H01M 4/131 (2013.01); H01M 4/1391 (2013.01); H01M 4/362 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 10/4235 (2013.01); H01M 2004/028 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A positive electrode slurry for preparing a positive electrode for a lithium secondary battery,
the positive electrode slurry comprising a positive electrode active material, a conductive material, a binder, an overcharge inhibitor, oxalic acid, and a solvent,
wherein the overcharge inhibitor is included in an amount of 1 part by weight to 2 parts by weight, based on 100 parts by weight of a total solid content of the positive electrode active material, the conductive material, and the binder,
wherein the oxalic acid is included in an amount of 0.15 part by weight to 0.5 parts by weight, based on 100 parts by weight of the total solid content of the positive electrode active material, the conductive material, and the binder,
wherein the positive electrode active material includes one or more lithium nickel-based oxides represented by the following Chemical Formula 1:
Lia(NixMnyCozAw)O2-bXb  [Chemical Formula 1]
in Chemical Formula 1,
A is one or more elements selected from the group consisting of W, V, Cr, Nb, Mo, Fe, and Al, X is one or more elements selected from the group consisting of P, N, F, S and Cl, 0.95≤a≤1.2, 0≤b≤0.02, 0.8≤x<1, 0<y<0.2, 0<z<0.2, 0≤w<0.2, and x+y+z+w=1, and
wherein the overcharge inhibitor consists of Li2CO3.