US 11,721,837 B2
Lithium secondary battery including fluoroethylene carbonate in electrolyte
Yunhee Kim, Yongin-si (KR); Kyoung Soo Kim, Yongin-si (KR); Yongchan You, Yongin-si (KR); Erang Cho, Yongin-si (KR); and Seonju Choi, Yongin-si (KR)
Assigned to SAMSUNG SDI CO., LTD., Yongin-si (KR)
Appl. No. 16/638,526
Filed by SAMSUNG SDI CO., LTD., Yongin-si (KR)
PCT Filed Aug. 1, 2018, PCT No. PCT/KR2018/008743
§ 371(c)(1), (2) Date Feb. 12, 2020,
PCT Pub. No. WO2019/050161, PCT Pub. Date Mar. 14, 2019.
Claims priority of application No. 10-2017-0113935 (KR), filed on Sep. 6, 2017.
Prior Publication US 2020/0373617 A1, Nov. 26, 2020
Int. Cl. H01M 10/0567 (2010.01); H01M 4/38 (2006.01); H01M 4/587 (2010.01); H01M 4/36 (2006.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); C07F 7/08 (2006.01); C07F 9/6574 (2006.01); C07F 5/04 (2006.01); H01M 4/02 (2006.01)
CPC H01M 10/0567 (2013.01) [C07F 5/04 (2013.01); C07F 7/0834 (2013.01); C07F 9/65742 (2013.01); H01M 4/364 (2013.01); H01M 4/366 (2013.01); H01M 4/386 (2013.01); H01M 4/387 (2013.01); H01M 4/587 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01); H01M 2300/0025 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A lithium secondary battery, comprising:
a negative electrode comprising a negative electrode active material comprising Si or Sn;
a positive electrode comprising a positive electrode active material; and
a non-aqueous electrolyte comprising a non-aqueous organic solvent; a lithium salt; fluoroethylene carbonate; a first additive comprising a compound represented by Chemical Formula 1; and a second additive comprising a compound represented by Chemical Formula 2:

OG Complex Work Unit Chemistry
wherein R1 to R6 are independently a substituted or unsubstituted primary, secondary, or tertiary alkyl group, a substituted or unsubstituted alkenyl group, or a substituted or unsubstituted aryl group,

OG Complex Work Unit Chemistry
wherein Rg, Rh, Ri, and Rj are independently a halogen or a halogen substituted or unsubstituted alkyl group or at least two of Rg, Rh, Ri, and Rj are linked with each other to form an oxalate group,
wherein a mixing ratio of the first additive to the second additive is a weight ratio of 10:1 to 0.066:1,
wherein an amount of the first additive is 0.5 wt % to 5 wt % based on a total weight of the electrolyte,
wherein an amount of the second additive is 0.5 wt % to 7 wt % based on total weight of the electrolyte, and
wherein an amount of the fluoroethylene carbonate is 0.1 wt % to 3 wt % based on a total weight of the electrolyte.