US 11,955,629 B2
Positive electrode active material for lithium secondary battery, and positive electrode comprising same
Jong Pil Kim, Daejeon (KR); Seung Beom Cho, Daejeon (KR); Won Tae Kim, Daejeon (KR); San Su Son, Daejeon (KR); and Hyuck Lee, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 15/757,589
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Mar. 31, 2017, PCT No. PCT/KR2017/003542
§ 371(c)(1), (2) Date Mar. 5, 2018,
PCT Pub. No. WO2017/171463, PCT Pub. Date Oct. 5, 2017.
Claims priority of application No. 10-2016-0039391 (KR), filed on Mar. 31, 2016; and application No. 10-2017-0040482 (KR), filed on Mar. 30, 2017.
Prior Publication US 2019/0027748 A1, Jan. 24, 2019
Int. Cl. H01M 4/505 (2010.01); C01G 53/00 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/525 (2010.01); H01M 10/052 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/505 (2013.01) [C01G 53/50 (2013.01); H01M 4/0471 (2013.01); H01M 4/131 (2013.01); H01M 4/525 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01); C01P 2002/74 (2013.01); C01P 2002/76 (2013.01); C01P 2002/78 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 6 Claims
 
1. A lithium secondary battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte,
wherein the positive electrode active material for a lithium secondary battery, the positive electrode active material consists of a compound represented by Formula 1 below and allowing reversible intercalation/deintercalation of lithium,
wherein from a crystal structure analysis of the positive electrode active material by a Rietveld method in which space group R-3m is used in a crystal structure model on the basis of an Xray diffraction analysis, a thickness of an MO slab is 2.1262 Å to 1270 Å, a thickness of an inter slab is 6051 Å to 6054 Å, and a cation mixing ratio between Li and Ni is from 0.30% to 0.36%,
wherein the cation mixing of Li and Ni refers to an amount of Ni cations present in a lithium layer,
Lix[Nia1Cob1Mnc1]O2  [Formula 1]
in Formula 1 above, 1.0≤x≤1.04, a1=0.88, b1=0.08, c1=0.04, and a1+b1+c1=1,
wherein a charging capacity of the lithium secondary battery is from 237.0 mAh/g to 237.2 mAh/g.