US 11,923,509 B2
Electrolyte including mixture of siloxane-based oligomer and polyalkylene carbonate-based oligomer and lithium secondary battery including the same
Won Kyung Shin, Daejeon (KR); Kyoung Ho Ahn, Daejeon (KR); Chul Haeng Lee, Daejeon (KR); Min Jung Kim, Daejeon (KR); and Jung Hoon Lee, Daejeon (KR)
Assigned to LG Energy Solution, Ltd.
Appl. No. 17/054,354
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jul. 26, 2019, PCT No. PCT/KR2019/009357
§ 371(c)(1), (2) Date Nov. 10, 2020,
PCT Pub. No. WO2020/036337, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. 10-2018-0095688 (KR), filed on Aug. 16, 2018.
Prior Publication US 2021/0210787 A1, Jul. 8, 2021
Int. Cl. H01M 10/0568 (2010.01); H01M 10/0525 (2010.01); H01M 10/0565 (2010.01); H01M 10/0569 (2010.01)
CPC H01M 10/0568 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0565 (2013.01); H01M 10/0569 (2013.01); H01M 2300/0082 (2013.01); H01M 2300/0085 (2013.01)] 13 Claims
 
1. An electrolyte for a lithium secondary battery, the electrolyte comprising:
a lithium salt present in a concentration of 1.6 M to 5 M;
an oligomer mixture including a first oligomer containing a unit represented by Formula 1 and a second oligomer containing a unit represented by Formula 2a or 2b; and
an organic solvent:

OG Complex Work Unit Chemistry
wherein, in Formula 1,
Ra and Rb are each independently hydrogen or an alkyl group having 1 to 5 carbon atoms, and
p is an integer of 1 to 50,

OG Complex Work Unit Chemistry
wherein, in Formula 2a,
Rh, Ri, Rj, and Rk are each independently hydrogen or an alkyl group having 1 to 5 carbon atoms,
Rm is an aliphatic hydrocarbon group or an aromatic hydrocarbon group,
R″ is hydrogen or an alkyl group having 1 to 3 carbon atoms,
m is an integer of 1 to 3,
t is an integer of 1 to 20, and
u is an integer of 1 to 10, and
s is an integer of 1 to 50,

OG Complex Work Unit Chemistry
wherein, in Formula 2b,
Rh, Ri, Rj, and Rk are each independently hydrogen or an alkyl group having 1 to 5 carbon atoms,
Rm is an aliphatic hydrocarbon group or an aromatic hydrocarbon group,
m′ is an integer of 1 to 2,
m″ is an integer of 1 to 3,
s is an integer of 1 to 50,
t is an integer of 1 to 20, and
u is an integer of 1 to 10.