US 12,438,153 B2
Lithium secondary battery
Jun Hyeok Han, Daejeon (KR); Kyoung Ho Ahn, Daejeon (KR); Chul Haeng Lee, Daejeon (KR); and Sol Ji Park, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/605,375
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Jul. 21, 2020, PCT No. PCT/KR2020/009607
§ 371(c)(1), (2) Date Oct. 21, 2021,
PCT Pub. No. WO2021/015535, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 10-2019-0088427 (KR), filed on Jul. 22, 2019.
Prior Publication US 2022/0209230 A1, Jun. 30, 2022
Int. Cl. H01M 4/525 (2010.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 10/0569 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 10/0569 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0034 (2013.01)] 8 Claims
 
1. A lithium secondary battery, comprising:
a positive electrode including a lithium transition metal oxide represented by Formula 1;
a negative electrode;
a separator disposed between the positive electrode and the negative electrode; and
a non-aqueous electrolyte solution containing a lithium salt, and a solvent,
wherein the lithium salt consists of LiN(SO2F)2 (LiFSI), LiN(SO2CF3)2 (LITFSI), LiN(SO2C2F5)2 (LiBETI), or a combination thereof, and the lithium salt is in a concentration of 1.5 M to 2.8 M,
wherein the solvent consists of a first non-aqueous solvent and a second non-aqueous solvent, the first non-aqueous solvent is a carbonate-based organic solvent,
the second non-aqueous solvent is a fluorine-based organic solvent, and
a volume ratio of the first non-aqueous solvent to the second non-aqueous solvent is in a range of 7:3 to 9:1,
wherein the non-aqueous electrolyte solution does not comprise propylene carbonate, and
wherein the fluorine-based organic solvent is a fluorine-containing ether organic solvent represented by Formula 2,
Li(NiaCobMnc)O2  [Formula 1]
wherein, in Formula 1,
0.6≤a≤0.9, 0.05≤b<0.3, 0.05≤c<0.3, and a+b+c=1,
[R1—O—R2]n  [Formula 2]
wherein, in Formula 2,
R1 and R2 are each independently an alkyl group having 1 to 10 carbon atoms substituted with at least one fluorine, and n is an integer of 1 to 10.