US 12,074,287 B2
Electrolyte for lithium secondary battery, and lithium secondary battery including same
Soojin Kim, Yongin-si (KR); Pavel Shatunov, Yongin-si (KR); Sangjae Park, Yongin-si (KR); and Hyerim Lee, Yongin-si (KR)
Assigned to SAMSUNG SDI CO., LTD., Yongin-si (KR)
Appl. No. 17/255,169
Filed by SAMSUNG SDI CO., LTD., Yongin-si (KR)
PCT Filed Jun. 11, 2019, PCT No. PCT/KR2019/006974
§ 371(c)(1), (2) Date Dec. 22, 2020,
PCT Pub. No. WO2020/009340, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 10-2018-0079030 (KR), filed on Jul. 6, 2018.
Prior Publication US 2021/0265662 A1, Aug. 26, 2021
Int. Cl. H01M 10/0567 (2010.01); H01M 10/0525 (2010.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01)
CPC H01M 10/0567 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 2300/0028 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An electrolyte for a lithium secondary battery, comprising:
a non-aqueous organic solvent,
a lithium salt, and
an additive,
wherein the additive includes:
a borate-based lithium salt, the borate-based lithium salt including lithium tetrafluoroborate (LiBF4), lithium bis(oxalate)borate (LiBOB), lithium difluoro(oxalato)borate (LiFOB), lithium bis(2-methyl-2-fluoro-malonato)borate, or a combination thereof; and
a compound represented by Chemical Formula 1, provided that the compound represented by Chemical Formula 1 is not trimethylsilyl isocyanate:
X-L-N═C═O  [Chemical Formula 1]
wherein, in Chemical Formula 1,
L is a single bond, O, S, SO2, a substituted or unsubstituted C1 to C20 alkylene group, a substituted or unsubstituted C2 to C20 alkenylene group, a substituted or unsubstituted C2 to C20 alkynylene group, a substituted or unsubstituted C6 to C30 arylene group, a substituted or unsubstituted C2 to C30 heteroarylene group, or a combination thereof,
X is Si(R1)(R2)(R3) or R4—SO2, and
R1 to R4 are independently hydrogen, deuterium, a halogen, a cyano group, an isocyanate group, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C20 alkynyl group, a substituted or unsubstituted C3 to C20 cycloalkyl group, a substituted or unsubstituted C1 to C30 alkylsilyl group, a substituted or unsubstituted C1 to C30 alkylsilyloxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heteroaryl group, or a combination thereof.