US 12,476,242 B2
Lithium secondary battery
Young Hoon Do, Daejeon (KR); Yoon Ji Lee, Daejeon (KR); Yong Hyun Cho, Daejeon (KR); and In Haeng Cho, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK ON CO., LTD., Seoul (KR)
Filed on Oct. 3, 2023, as Appl. No. 18/479,926.
Application 18/479,926 is a division of application No. 17/003,635, filed on Aug. 26, 2020, granted, now 11,811,019, issued on Nov. 7, 2023.
Claims priority of application No. 10-2019-0105944 (KR), filed on Aug. 28, 2019.
Prior Publication US 2024/0072298 A1, Feb. 29, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/131 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01); H01M 10/0569 (2010.01); H01M 4/02 (2006.01); H01M 50/46 (2021.01)
CPC H01M 4/131 (2013.01) [H01M 4/364 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 10/0567 (2013.01); H01M 10/0569 (2013.01); H01M 2004/028 (2013.01); H01M 50/46 (2021.01); H01M 2300/0025 (2013.01); H01M 2300/0034 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A lithium secondary battery comprising:
a positive electrode comprising a first lithium-metal oxide comprising secondary particles formed by aggregating primary particles having a particle diameter of less than 2 μm, and a second lithium-metal oxide comprising nickel and at least one or more metals and comprising primary particles having a particle diameter of 2 μm or more, wherein the at least one or more metals comprises manganese, cobalt, or both;
a negative electrode;
a separator interposed between the positive electrode and the negative electrode; and
an electrolyte comprising a lithium salt, a nonaqueous organic solvent, and a compound containing at least one difluorophosphite group and at least one or more olefin groups,
wherein the compound containing at least one difluorophosphite group and at least one or more olefin groups is represented by the following Chemical Formula 4 or Chemical Formula 5:

OG Complex Work Unit Chemistry
wherein
R1 to R3 are independently of one another hydrogen, *—(CH2)r—OPF2, C1-C10 alkyl, or C2-C10 alkenyl;
L is C1-C10 alkylene, and the alkylene of L may be further substituted by one or more selected from the group consisting of C1-C10 alkyl, *—(CH2)a—OPF2, and

OG Complex Work Unit Chemistry
R′ is hydrogen or —OPF2;
a and b are independently of each other an integer of 0 to 5;
q is an integer of 0 to 5; and
r is an integer of 0 to 5,

OG Complex Work Unit Chemistry
wherein
ring D is mono-, bi-, or tri-C6-C20 cycloalkenyl,
wherein the compound containing at least one difluorophosphite group and at least one or more olefin groups is comprised at 0.1 to 5 wt %, based on a total weight of the electrolyte.