Abstract: A sulfur-carbon composite including a porous carbon material; and sulfur coated on at least a portion of an inside and a surface of the porous carbon material, wherein a pore volume of the sulfur-carbon composite is 0.04 to 0.400 cm3/g and a specific surface area of the sulfur-carbon composite is 4.0 to 30 m2/g, and a method for preparing the same.

Abstract: A lithium secondary battery, and more particularly, to a lithium secondary battery having improved performance by minimizing the content of impurities such as sodium in the battery.

Abstract: A carbon-sulfur composite including a carbonized metal-organic framework (MOF); and a sulfur compound introduced to at least a part of an outside surface and an inside of the carbonized metal-organic framework, wherein the carbonized metal-organic framework has a specific surface area of 2500 m2/g to 4000 m2/g, and the carbonized metal-organic framework has a pore volume of 0.1 cc/g to 10 cc/g, and a method for preparing the same.

Abstract: Disclosed is a carbon-based fiber sheet and a lithium-sulfur battery including the same. The carbon-based fiber sheet for the lithium-sulfur battery is doped with a high concentration of nitrogen and thus plays a role of preventing diffusion by adsorbing lithium polysulfide eluted from a positive electrode during charging and discharging, thereby suppressing a shuttle reaction and thus improving capacity and lifecycle properties of the lithium-sulfur battery.

Abstract: A positive electrode for a lithium-sulfur battery and a lithium-sulfur battery including the same, and in particular, a positive electrode for a lithium-sulfur battery including an active material, a conductive material, a binder and an additive, wherein the additive includes an organic acid lithium salt, the organic acid lithium salt including a dicarboxyl group. By including a dicarboxyl group-including organic acid lithium salt as the additive, the positive electrode for the lithium-sulfur battery is capable of enhancing capacity and lifetime properties of the lithium-sulfur battery through enhancing lithium ion migration properties.

Abstract: A titania-carbon-sulfur composite including a titania-carbon composite prepared by mixing cylindrical carbon materials and titania (TiO2-x), in which some oxygen is reduced (i.e., x is less than 2), to have a structure in which cylindrical carbon materials are entangled and interconnected in three dimensions; and sulfur introduced into at least a part of the external surface and inside of the titania-carbon (TiO2—C) composite, and a method for preparing the same.

Abstract: An active material recovery apparatus includes a heat treatment bath and a screening wall extending along a first axis. The heat treatment bath includes a heating zone and the screening wall includes a cooling zone. The active material recovery apparatus includes an exhaust injection and a degassing system. The heat treatment bath is configured to remove a binder and a conductive material in an active material layer and to perform heat treatment in air on an electrode scrap including the active material layer on a current collector. The screen wall is configured to recover the active material in powder form. The active material recovery apparatus is configured to separately recover the current collector that does not pass through the screening wall. The heat treatment bath includes protrusions in a sawtooth shape on a first cross-section orthogonal to the first axis.

Abstract: A binder for preparing a positive electrode of a lithium-sulfur secondary battery, a composition including the binder, a positive electrode including the composition and a lithium-sulfur secondary battery including the positive electrode. The binder includes an acrylic polymer, and the acrylic polymer includes a unit formed from a hydroxyphenyl-based monomer or a disulfide-based monomer. The acrylic polymer may include 1 to 20 wt. % of units formed from the hydroxyphenyl-based monomer. The acrylic polymer may include 1 to 20 wt. % of units formed from the disulfide-based monomer. Such a battery has increased long-term stability due to suppression of leaching of the sulfur-based materials by absorption of lithium polysulfides.

Abstract: A positive electrode slurry composition, a positive electrode manufactured using the same, and a battery including the positive electrode. The positive electrode slurry composition includes a positive electrode active material, a binder, an alcohol, and water, wherein a content of the alcohol is in a range of 0.1 to 10% by weight, based on a total weight of the composition. The slurry composition for manufacturing a positive electrode has effects of highly improving the dispersibility of the positive electrode active material and the conductive material, decreasing the surface roughness of an electrode, and remarkably reducing a curling phenomenon in the electrode. Also, the slurry composition has an economic advantage in that a dispersing agent is not used or an amount of the dispersing agent used can be remarkably reduced.

Abstract: A method of recovering an active material from a positive electrode scrap and reusing the active material is provided.

Abstract: A separator for lithium-sulfur batteries and a lithium-sulfur battery including the same. The separator for lithium-sulfur batteries includes a separator substrate, a first coating layer formed on at least one surface of the separator substrate, and a second coating layer formed on the first coating layer. The first coating layer includes a polydopamine, and the second coating layer includes a lithium-substituted water-soluble polymer. Also a method for preparing the separator.

Abstract: A method for reusing a positive electrode active material includes dry-milling a positive electrode scrap comprising an active material layer on a current collector to convert the active material layer into a powdered state and to separate the active material layer from the current collector. The active material layer is a lithium composite transition metal oxide positive material active material layer. The method further includes adding a lithium precursor to a the active material layer. The method further includes thermally treating the active material layer in the powdered state to collect an active material. The method further includes obtaining a reusable active material by washing the collected active material with a basic lithium compound aqueous solution and drying the collected active material.

Abstract: Porous carbon particles, and a positive electrode active material and a lithium secondary battery including the same. This may improve the energy density of the lithium secondary battery by applying a porous electrode containing micropores and mesopores and having a uniform size distribution and shape as a positive electrode material.

Abstract: A sulfur-carbon composite including porous carbon material, and sulfur, wherein at least a portion of an inside and a surface of the porous carbon material coated with the sulfur, the sulfur-carbon composite has a pore volume of 0.180 cm3/g to 0.300 cm3/g, and the sulfur-carbon composite has an average pore size of 40.0 nm to 70.0 nm, and a method of manufacturing the same. Also, a method of manufacturing a sulfur-carbon composite, which includes (a) mixing a porous carbon material with sulfur particles, wherein the sulfur particles have a particle size of 1 nm to 1 ?m using a Henschel mixer; and (b) drying the resulting mixture of (a).

Abstract: There is provided a method of collecting and reusing an active material from a positive electrode scrap. The method of reusing a positive electrode active material according to the present disclosure includes (a-1) dry-milling a positive electrode scrap comprising an active material layer on a current collector to form the active material layer into a powdered state and separate the current collector, (a-2) thermally treating the active material layer in powder form in air for thermal decomposition of a binder and a conductive material in the active material layer, to collect an active material, (b) washing the active material collected from the step (a-2) with a lithium compound solution which is basic in an aqueous solution and drying, and (c) annealing the active material washed from the step (b) with an addition of a lithium precursor to obtain a reusable active material.

Abstract: A sulfur-carbon composite including a porous carbon material; and sulfur coated on at least a portion of an inside and a surface of the porous carbon material, wherein a pore volume of the sulfur-carbon composite is 0.04 to 0.400 cm3/g and a specific surface area of the sulfur-carbon composite is 4.0 to 30 m2/g, and a method for preparing the same.

Abstract: A sulfur-carbon composite including a porous carbon material; and sulfur present in at least a part of pores of the porous carbon material and on an outer surface of the porous carbon material, wherein an inner surface and the outer surface of the porous carbon material are doped with a carbonate compound. Also, a positive electrode and a secondary battery including the same. Further, a method of preparing a sulfur-carbon composite and a method of preparing a positive electrode.

Abstract: A carbon-sulfur composite including a carbonized metal-organic framework (MOF); and a sulfur compound introduced to at least a part of an outside surface and an inside of the carbonized metal-organic framework, wherein the carbonized metal-organic framework has a specific surface area of 2500 m2/g to 4000 m2/g, and the carbonized metal-organic framework has a pore volume of 0.1 cc/g to 10 cc/g, and a method for preparing the same.

Abstract: A method for producing a lithium-sulfur battery with an improved lifetime. This method includes an activation step of forming a positive electrode active material-derived compound from a compound including elemental sulfur by charging and discharging the lithium-sulfur battery, where the battery includes the compound including elemental sulfur and an electrolyte liquid. Additionally, the positive electrode active material-derived compound has a solubility of 1% by weight or greater in the electrolyte liquid. The lithium-sulfur battery may be charged and discharged in a range of greater than 2.0 V and less than 2.4 V in the activation step. Further, the lithium-sulfur battery may be charged and discharged 3 times to 10 times in the activation step. This method avoids a complicated application process of and active material in preparing a lithium-sulfur battery.

Abstract: A binder for preparing a positive electrode of a lithium secondary battery, and a method for preparing a positive electrode using the same. The binder includes two or more different lithium-substituted polyacrylic acids with different molecular weights. The lithium-substituted polyacrylic acids include two different lithium-substituted polyacrylic acids differing in weight average molecular weight by 500,000 or more from each other.