US 12,191,481 B2
Lithium composite oxide and lithium secondary battery comprising the same
Moon Ho Choi, Cheongju-si (KR); Jun Won Suh, Cheongju-si (KR); Jin Kyeong Yun, Cheongju-si (KR); Jung Han Lee, Cheongju-si (KR); Mi Hye Yun, Cheongju-si (KR); Seung Woo Choi, Cheongju-si (KR); Gwang Seok Choe, Cheongju-si (KR); Joong Ho Bae, Cheongju-si (KR); and Jin-Oh Son, Cheongju-si (KR)
Assigned to ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed by ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed on Sep. 28, 2020, as Appl. No. 17/035,660.
Claims priority of application No. 10-2019-0125099 (KR), filed on Oct. 10, 2019.
Prior Publication US 2021/0111396 A1, Apr. 15, 2021
Int. Cl. H01M 4/36 (2006.01); C01G 53/00 (2006.01); H01M 4/02 (2006.01); H01M 4/131 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [C01G 53/50 (2013.01); H01M 4/131 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2002/72 (2013.01); H01M 2004/028 (2013.01); Y02E 60/10 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A lithium composite oxide, comprising:
primary particles enabling lithium intercalation and deintercalation and comprising at least nickel (Ni), cobalt (Co) and manganese (Mn), and secondary particles in which the primary particles are aggregated; and
a coating layer having a boron (B)-containing oxide, which covers at least a part of a region selected from the interface between the primary particles and the surface of the secondary particle,
wherein a full width at half-maximum (FWHM; deg., 2θ) range of a (104) peak among XRD peaks defined by the hexagonal lattice with an R-3m space group is represented by Expression 1 below:
−0.025≤FWHM(104)−{0.04+(q−0.6)×0.25}≤0.025  [Expression 1]
In Expression 1, q is a molar ratio of nickel with respect to the total molar ratio of metal elements excluding lithium in the primary particle, and the FWHM(104) is represented by Expression 2 below,
FWHM(104)=FWHMLi(104)−FWHMSi(220)  [Expression 2]
In Expression 2,
the FWHMLi(104) indicates the FWHM of a (104) peak observed at 44.5±1.0° (2θ) among XRD measurement values of the lithium composite oxide, and
the FWHMSi(220) indicates the FWHM of a (220) peak observed at approximately 47.3+1.0° (2θ) among XRD measurement values of an Si powder,
wherein the amount of Co and Mn in relation to the total amount of Co, Mn and Ni in the lithium composite oxide is from 6 to 40 mol % and the amount of a dopant other than Co, Mn and Ni in the lithium composite oxide is 2,719 ppm or less.