US 11,870,036 B2
Lithium secondary battery having improved high-temperature characteristics
Gwang Yeon Kim, Daejeon (KR); Chul Haeng Lee, Daejeon (KR); Kyoung Ho Ahn, Daejeon (KR); and Jeong Woo Oh, Daejeon (KR)
Assigned to LG Energy Solution, Ltd.
Appl. No. 16/766,976
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jul. 2, 2019, PCT No. PCT/KR2019/008065
§ 371(c)(1), (2) Date May 26, 2020,
PCT Pub. No. WO2020/009436, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 10-2018-0076682 (KR), filed on Jul. 2, 2018.
Prior Publication US 2021/0036365 A1, Feb. 4, 2021
Int. Cl. H01M 10/0567 (2010.01); H01M 4/131 (2010.01); H01M 4/134 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 10/0569 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/0567 (2013.01) [H01M 4/131 (2013.01); H01M 4/134 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 10/0569 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 8 Claims
 
1. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
an organic solvent,
a first lithium salt that is LiPF6,
a second lithium salt excluding LiPF6,
a first additive that is an oligomer represented by Formula 1, and
a second additive that is a mixed additive of lithium difluorophosphate (LiDFP), fluorobenzene (FB), and tetravinylsilane (TVS),
wherein the second additive comprises the lithium difluorophosphate (LiDFP), the fluorobenzene (FB), and the tetravinylsilane (TVS) in a weight ratio of 1:1:0.05 to 1:6:0.5:

OG Complex Work Unit Chemistry
wherein, in Formula 1,
R1 is —R1′—O—, wherein R1′ is an alkylene group having 1 to 5 carbon atoms which is unsubstituted or substituted with fluorine,
R2 is —R2′—O—, wherein R2′ is an alkylene group having 1 to 3 carbon atoms which is unsubstituted or substituted with fluorine,
R3 is an alkylene group having 1 to 5 carbon atoms which is unsubstituted or substituted with fluorine,
R4 is an aliphatic hydrocarbon group or an aromatic hydrocarbon group,
Ra and Rb are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms,
o, p, q, and r are numbers of repeating units,
is an integer of 1 to 5,
p is an integer of 1 to 10,
r is an integer of 1 to 5,
q is an integer of 3 to 15, and
b and c are each independently an integer of 1 to 3.