Electrolyte for lithium-sulfur battery and lithium-sulfur battery comprising same
The present disclosure relates to an electrolyte solution for a lithium-sulfur battery containing a lithium salt, an organic solvent, and an additive, wherein the additive includes a heterocyclic compound containing one or more double bonds, the hetero atom contained in the ring of the heterocyclic compound is an oxygen atom or a sulfur atom, and the organic solvent is selected from the group consisting of a linear ether-based solvent, a cyclic ether-based solvent, and combinations thereof.
1 . An electrolyte solution for a lithium-sulfur battery, comprising:
a lithium salt;
an organic solvent; and
an additive,
wherein the additive comprises a heterocyclic compound containing one or more double bonds,
wherein a hetero atom contained in a ring of the heterocyclic compound is an oxygen atom or a sulfur atom,
wherein the organic solvent is selected from the group consisting of a linear ether-based solvent, a cyclic ether-based solvent, and a combination thereof,
wherein the organic solvent comprises at least dimethoxyethane,
wherein the cyclic ether-based solvent excludes a solvent selected from the group consisting of dioxolane, methyldioxolane, dimethyldioxolane, vinyldioxolane, methoxydioxolane, ethylmethyldioxolane, and a combination thereof,
wherein the heterocyclic compound is comprised in a volume ratio of 15 to 24 relative to 100 volume ratio of the organic solvent, and
wherein the heterocyclic compound is selected from the group consisting of furan, 2-methylfuran, 3-methylfuran, 2-ethylfuran, 2-propylfuran, 2-butylfuran, 2,3-dimethylfuran, 2,4-dimethylfuran, 2,5-dimethylfuran, pyran, 2-methylpyran, 3-methylpyran, 4-methylpyran, benzofuran, 2-(2-nitrovinyl)furan, thiophene, 2-methylthiophene, 2-ethylthiophene, 2-propylthiophene, 2-butylthiophene, 2,3-dimethylthiophene, 2,4-dimethylthiophene, 2,5-dimethylthiophene, and a combination thereof.
2 . The electrolyte solution for the lithium-sulfur battery according to claim 1 , wherein the organic solvent consists of a linear ether-based solvent.
3 . The electrolyte solution for the lithium-sulfur battery according to claim 1 , wherein the linear ether-based solvent further comprises dimethyl ether, diethyl ether, dipropyl ether, dibutyl ether, diisobutyl ether, ethylmethyl ether, ethylpropyl ether, ethyltertbutyl ether, dimethoxymethane, trimethoxymethane, diethoxyethane, dimethoxypropane, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene glycol divinyl ether, diethylene glycol divinyl ether, triethylene glycol divinyl ether, dipropylene glycol dimethylene ether, butylene glycol ether, diethylene glycol ethyl methyl ether, diethylene glycol isopropyl methyl ether, diethylene glycol butyl methyl ether, diethylene glycol tertbutyl ethyl ether, ethylene glycol ethyl methyl ether, or a combination thereof.
4 . The electrolyte solution for the lithium-sulfur battery according to claim 1 , wherein the cyclic ether-based solvent is selected from the group consisting of dioxane, trioxane, tetrahydrofuran, methyltetrahydrofuran, dimethyltetrahydrofuran, dimethoxytetrahydrofuran, ethoxytetrahydrofuran, tetrahydropyran, and a combination thereof.
5 . The electrolyte solution for the lithium-sulfur battery according to claim 1 , wherein the heterocyclic compound is 2-methylfuran, and
wherein the organic solvent is dimethoxyethane.
6 . The electrolyte solution for the lithium-sulfur battery according to claim 1 , wherein the lithium salt is selected from the group consisting of LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiC 4 BO 8 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, (C 2 F 5 SO 2 ) 2 NLi, (SO 2 F) 2 NLi, (CF 3 SO 2 ) 3 CLi, lithium chloroborane, lithium lower aliphatic carboxylate, lithium tetraphenyl borate, lithium imide and a combination thereof.
7 . A lithium-sulfur battery comprising,
a positive electrode;
a negative electrode;
a separator between the positive electrode and the negative electrode; and
the electrolyte solution of claim 1 .