Abstract: A lithium-sulfur battery with improved lifetime performance is provided. The lithium-sulfur battery comprises an electrolyte including a first solvent containing fluorine-based ether compounds, a second solvent containing a glyme-based compound, and a lithium salt containing lithium bis (pentafluoroethanesulfonyl) imide; and a positive electrode including an active material containing sulfur and carbon material, and can utilize 80% or more of the theory discharging capacity of sulfur and can operate for a long life, by using an electrolyte system of SSE excluding nitrile solvents and at the same time applying a carbon material with a high specific surface area to the positive electrode.

Abstract: A porous carbon material, a method for preparing the same, a positive electrode including the same, and a lithium-sulfur battery including the same are provided. The porous carbon material has a specific surface area of 200 to 1,700 m2/g and impurities therefrom are removed through pre-treatment using microwaves. The porous carbon material, when applied to the positive electrode of the lithium-sulfur battery, improves the charging overvoltage problem of the lithium-sulfur battery.

Abstract: An electrolyte solution for a lithium secondary battery, which is capable of not only operating at a low temperature by lowering resistance, but also securing the stable lifetime characteristics of the battery, and increasing the discharging capacity at a low temperature. The electrolyte solution for the lithium secondary battery includes a first solvent including at least one glyme-based compound; a second solvent including at least one conjugated heterocyclic compound; a third solvent including at least one non-conjugated cyclic ether-based compound; and lithium salt.

Abstract: 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.

Abstract: The present disclosure relates to an electrolyte solution for a lithium-sulfur battery comprising a first solvent comprising a heterocyclic compound containing one or more double bonds and at the same time, containing any one of an oxygen atom and a sulfur atom; a second solvent comprising at least one of an ether-based compound, an ester-based compound, an amide-based compound, and a carbonate-based compound; lithium salt; lithium nitrate; and borate-based lithium salt, and a lithium-sulfur battery comprising the same.

Abstract: The present disclosure relates to an electrolyte for a lithium-sulfur battery including a non-aqueous organic solvent including specific three types of compounds, and a lithium-sulfur battery including the same.

Abstract: A lithium-sulfur battery comprising an electrolyte including a first solvent containing a fluorine-based ether compound, a second solvent containing a glyme-based compound, and a lithium salt; and a positive electrode including active materials comprising sulfur and a carbon material, the lithium-sulfur battery having a sulfur utilization rate of sulfur included in the positive electrode of 90% or higher based on a theoretical discharge capacity, is provided.

Abstract: The present disclosure relates to an electrolyte solution for a lithium-sulfur batteries comprising a lithium salt and an organic solvent, wherein the organic solvent comprises a first solvent, a second solvent, and a third solvent, the first solvent comprises a compound represented by Formula 1 or Formula 2 containing a cyano group (—CN); a linear ether containing two or more oxygen atoms; or a cyclic ether, the second solvent comprises a fluorinated ether-based solvent, and the third solvent comprises an ether-based non-solvent represented by Formula 3 below.

Abstract: An electrolyte solution for a lithium secondary battery including a first solvent containing a heterocyclic compound having at least one double bond and any one of an oxygen atom and a sulfur atom; a second solvent containing at least one of an ether-containing compound that does not contain fluorine, an ester-containing compound, an amide-containing compound, and a carbonate-containing compound; a third solvent containing a hydrofluoro ether-containing compound; a lithium salt; lanthanum nitrate; and lithium nitrate.

Abstract: An electrolyte solution for a lithium secondary battery, including a first solvent comprising a heterocyclic compound haying at least one double bond, and any one of an oxygen atom and a sulfur atom; a second solvent including at least one of an ether-containing compound, an ester-containing compound, an amide-containing compound, and a carbonate-containing compound; a lithium salt; lanthanum nitrate; and an additive including lithium nitrate.