US 12,255,331 B2
Lithium-sulfur secondary battery
Intae Park, Daejeon (KR); Doo Kyung Yang, Daejeon (KR); Youngcheol Choi, Daejeon (KR); Soohyun Kim, Daejeon (KR); and Changhoon Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 16/971,177
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Oct. 24, 2019, PCT No. PCT/KR2019/014039
§ 371(c)(1), (2) Date Aug. 19, 2020,
PCT Pub. No. WO2020/085811, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 10-2018-0128729 (KR), filed on Oct. 26, 2018; and application No. 10-2019-0131538 (KR), filed on Oct. 22, 2019.
Prior Publication US 2021/0104745 A1, Apr. 8, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/58 (2010.01); H01M 4/02 (2006.01); H01M 4/136 (2010.01); H01M 10/052 (2010.01); H01M 10/0569 (2010.01)
CPC H01M 4/5815 (2013.01) [H01M 4/136 (2013.01); H01M 10/052 (2013.01); H01M 10/0569 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0028 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A lithium-sulfur secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution, wherein the positive electrode has an SC factor value of 0.45 or more represented by Equation 1 below:

OG Complex Work Unit Math
wherein P is the porosity (%) of the positive electrode active material layer in the positive electrode, L is the mass of sulfur (mg/cm2) per unit area of the positive electrode active material layer in the positive electrode, and α is 10 (constant),
wherein the electrolyte solution comprises a first solvent, a second solvent, and a lithium salt,
wherein the first solvent is selected from the group consisting of propionitrile, dimethylacetamide, dimethylformamide, triethylamine, 1-iodopropane, and or combinations thereof, and
wherein the second solvent is a fluorinated ether-based solvent.