Lithium-sulfur battery electrolyte and lithium-sulfur battery comprising same

An electrolyte for a lithium-sulfur battery comprising:

• a lithium salt;
• a non-aqueous organic solvent;
• and
• an additive,
• wherein the non-aqueous organic solvent comprises a linear ether compound and a heterocyclic compound, wherein the heterocyclic compound comprises an oxygen atom or a sulfur atom,
• wherein the heterocyclic compound comprises one or more double bonds, and
• wherein the additive comprises a carbonate compound;
• wherein the carbonate compound comprises at least one selected from the group consisting of bis(4-nitrophenyl)carbonate, bis(2-nitrophenyl)carbonate, 2-(methylsulfonyl)ethyl 4-nitrophenyl carbonate, benzyl 4-nitrophenyl carbonate, 2-(trimethylsilyl)ethyl 4-nitrophenyl carbonate, vinylene carbonate, vinyl ethylene carbonate, and allyl methyl carbonate,
• wherein the linear ether compound comprises at least one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methylethyl ether, methylpropyl ether, ethylpropyl ether, dimethoxyethane, diethoxyethane, ethylene glycol ethylmethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methylethyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol methylethyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, tetraethylene glycol methylethyl ether, polyethylene glycol dimethyl ether, polyethylene glycol diethyl ether, and polyethylene glycol methylethyl ether, and
• wherein the heterocyclic compound comprises at least one 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, and 2,5-dimethylthiophene.