US 12,334,501 B2
Electrolyte for lithium-sulfur battery and lithium-sulfur battery comprising same
Yeyoung Ha, Daejeon (KR); and Jaegil Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed on Mar. 3, 2023, as Appl. No. 18/116,931.
Application 18/116,931 is a continuation of application No. 17/053,821, granted, now 11,631,896, previously published as PCT/KR2019/015733, filed on Nov. 18, 2019.
Claims priority of application No. 10-2018-0145896 (KR), filed on Nov. 23, 2018; application No. 10-2019-0039756 (KR), filed on Apr. 4, 2019; and application No. 10-2019-0144814 (KR), filed on Nov. 13, 2019.
Prior Publication US 2023/0207881 A1, Jun. 29, 2023
Int. Cl. H01M 10/0568 (2010.01); H01M 4/38 (2006.01); H01M 10/052 (2010.01); H01M 10/0567 (2010.01); H01M 10/44 (2006.01); H01M 10/0569 (2010.01); H01M 10/42 (2006.01)
CPC H01M 10/0568 (2013.01) [H01M 4/382 (2013.01); H01M 10/052 (2013.01); H01M 10/0567 (2013.01); H01M 10/44 (2013.01); H01M 10/0569 (2013.01); H01M 10/4235 (2013.01); H01M 2300/0037 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for inhibiting the generation of lithium dendrites in a lithium-sulfur battery, comprising:
providing a lithium-sulfur battery comprising a positive electrode; a negative electrode; a separator interposed between the positive electrode and the negative electrode; and an electrolyte solution; and
operating the lithium-sulfur battery,
wherein:
the negative electrode comprises a lithium-based metal, and
the electrolyte solution comprises a lithium salt, a first organic solvent, and a second organic solvent,
wherein the second organic solvent comprises a heterocyclic compound containing at least one double bond, where the heterocyclic compound further comprises an oxygen atom or a sulfur atom; with the proviso that the heterocycle ring does not comprise a nitrogen atom,
wherein the heterocyclic compound comprises at least one selected from the group consisting of pyran, 2-methylpyran, 3-methylpyran, 4-methylpyran, thiophene, 2-methylthiophene, 2-ethylthiophene, 2-propylthiophene, 2-butylthiophene, 2,3-dimethylthiophene, 2,4-dimethylthiophene, and 2,5-dimethylthiophene,
wherein the method further comprises forming a protective film on a surface of the lithium-based metal by a ring-opening polymerization reaction of the heterocyclic compound contained in the electrolyte solution in an initial discharging stage of the lithium-sulfur battery; and
wherein the heterocyclic compound is present in an amount of 23.1 to 38% by weight relative to the total weight of the electrolyte solution for the lithium-sulfur battery.