Abstract: The present disclosure relates to a carbon nanotube dispersion liquid comprising bundle-type carbon nanotubes; a dispersion medium; and a polyvinyl butyral resin having a weight average molecular weight of greater than 50,000, a method for preparing the same, methods for preparing electrode slurry and an electrode using the same, and an electrode and a secondary battery prepared using the carbon nanotube dispersion liquid.

Abstract: The present invention relates to positive electrode active material slurry including two different types of binders in a specific ratio and having a high solid concentration and low viscosity, a positive electrode including a positive electrode active material layer formed therefrom, and a lithium secondary battery including the positive electrode.

Abstract: Provided are a method of preparing a composition for forming a positive electrode of a lithium secondary battery which includes preparing a first dispersed solution by primary dispersion of a conductive agent and a dispersant in a solvent, preparing a second dispersed solution by adding binder powder to the first dispersed solution and performing secondary dispersion, and adding and mixing a positive electrode active material to the second dispersed solution, and a positive electrode and a lithium secondary battery which are prepared by using the composition. A composition for forming a positive electrode of a lithium secondary battery, which has improved dispersibility, may be prepared by the above method, and internal resistance of the battery may be reduced and output characteristics may be improved when a positive electrode is prepared by using the composition.

Abstract: Disclosed is a dissolution mixer, which includes: a dissolution bath configured to accommodate a powder and a solvent for dissolving the powder; a powder input unit located at an outer side of the dissolution bath; an impeller installed to be rotatable inside the dissolution bath; and an anchor located inside the dissolution bath and having a passage of the powder inputted by the powder input unit and a powder spouting hole connected to the passage.

Abstract: Disclosed is a method for manufacturing an electrode for a lithium secondary battery, including the steps of: (S1) dry mixing a conductive material and an electrode active material; (S2) dry mixing the resultant product of step (S1) with a binder to obtain electrode mixture powder; and (S3) applying the electrode mixture powder to at least one surface of a current collector. According to an embodiment of the present disclosure, electrode mixture powder is prepared without using a solvent and is applied to a current collector to provide an electrode. Thus, there is no need for a separate drying step. Therefore, the binder and conductive material coated on the surface of electrode active material cause no surface migration phenomenon. As a result, it is possible to prevent degradation of the adhesion of the electrode, and thus to prevent degradation of the performance of the lithium secondary battery.

Abstract: Disclosed is a system for manufacturing an electrode for a secondary battery, which includes an active material drying unit configured to dry an active material coated on an electrode current collector, and a tester unit configured to measure a dried state of the active material by performing a scratch test to the dried active material.

Abstract: The present invention relates to positive electrode active material slurry of which degree of non-crystallinity is controlled by including a rubber-based binder in a specific ratio, a positive electrode including a positive electrode active material layer formed therefrom, and a lithium secondary battery including the positive electrode. The positive electrode active material layer formed from the positive electrode active material slurry has enhanced flexibility and rolling property, and internal short circuits, high voltage defects and capacity decline of the lithium secondary battery using the positive electrode including the same are capable of being suppressed.

Abstract: The present disclosure relates to a carbon nanotube dispersion including entangled-type carbon nanotubes, a dispersion medium, and partially hydrogenated nitrile rubber having a residual double bond (RDB) value of 0.5% by weight to 40% by weight calculated according to the following Mathematical Formula 1, wherein dispersed particle diameters of the carbon nanotubes have particle size distribution D50 of 2 ?m to 5 ?m, a method for preparing the same, and methods for preparing electrode slurry and an electrode using the same.

Abstract: The present invention provides a conductive material dispersed liquid including a conductive material which includes bundle-type carbon nanotubes; a dispersant which includes a hydrogenated nitrile-based rubber; and a dispersion medium, where a complex modulus (|G*| @ 1 Hz) is in a range of 20 to 500 Pa when measured by a rheometer at a frequency of 1 Hz, and a secondary battery manufactured using the same. The conductive material dispersed liquid has a controlled complex modulus to exhibit excellent dispersibility and powder resistance characteristics, and as a result, can greatly improve the output characteristics of batteries.

Abstract: Disclosed is a method for preparing positive electrode active material slurry, which includes the steps of: (S1) preparing a positive electrode active material, a linear conductive material, a polymer binder and a solvent; (S2) introducing 40-80% of the prepared polymer binder, the positive electrode active material and the linear conductive material to the solvent, followed by mixing, to obtain a first positive electrode active material slurry; and (S3) further introducing the remaining polymer binder to the first positive electrode active material slurry, followed by mixing, to obtain a second positive electrode active material slurry.

Abstract: The present disclosure relates to a carbon nanotube dispersion including carbon nanotubes, a dispersion medium, and partially hydrogenated nitrile rubber having a residual double bond (RDB) value of 0.5% by weight to 40% by weight calculated according to Mathematical Formula 1, a method for preparing the same, and methods for preparing electrode slurry and an electrode using the same.

Abstract: The present invention relates to positive electrode active material slurry of which degree of non-crystallinity is controlled by including a rubber-based binder in a specific ratio, a positive electrode including a positive electrode active material layer formed therefrom, and a lithium secondary battery including the positive electrode. The positive electrode active material layer formed from the positive electrode active material slurry has enhanced flexibility and rolling property, and internal short circuits, high voltage defects and capacity decline of the lithium secondary battery using the positive electrode including the same are capable of being suppressed.

Abstract: The present disclosure relates to a carbon nanotube dispersion liquid comprising bundle-type carbon nanotubes; a dispersion medium; and a polyvinyl butyral resin having a weight average molecular weight of greater than 50,000, a method for preparing the same, methods for preparing electrode slurry and an electrode using the same, and an electrode and a secondary battery prepared using the carbon nanotube dispersion liquid.

Abstract: The present invention relates to a grinder using induced electric fields. The grinder comprises: a grinding unit on which a plurality of protrusions for cutting are disposed on an outer circumferential surface thereof; a power unit disposed in the grinding unit to generate electric fields and attach the conductive materials to the grinding unit; and a chamber disposed outside the grinding unit and comprising beads that disperse and grind the conductive materials attached to the grinding unit, wherein the conductive materials have directionality by the electric fields of the power unit.

Abstract: The present disclosure relates to a carbon black dispersion solution comprising carbon black, a dispersion medium, and partially hydrogenated nitrile rubber having a residual double bond (RDB) value of 0.5% by weight to 40% by weight calculated according to the following Mathematical Formula 1, wherein dispersed particle diameters of the carbon black have particle size distribution D50 of 0.1 ?m to 2 ?m, a method for preparing the same, and methods for preparing electrode slurry and an electrode using the same.

Abstract: The carbon nanotube pellets according to the present invention are produced by using only a small amount of solvent and have increased apparent density. The present invention can improve the problems of the change of the content generated by scattering of powders and safety issues by using carbon nanotubes in the form of pellet rather than carbon nanotubes in the form of powder in composite materials. And since the density of the pellet form is higher than that of the powder form, transport, transfer and improvement become easier. Therefore, it can be more effectively applied to the manufacturing of composite materials.

Abstract: The present invention provides a composition for forming a positive electrode of a secondary battery which includes a positive electrode active material, a conductive material, and a dispersing agent, in which the conductive material includes a carbon-based material having a specific surface area of 130 m2/g or more and an oil absorption number of 220 ml/100g or more at 0.1 wt % to 2 wt % with respect to the total weight of the composition for forming a positive electrode, and the dispersing agent is introduced into the conductive material to form a conductive material-dispersing agent composite, and the conductive material-dispersing agent composite has a particle size distribution D50 of 0.8 ?m to 1.2 ?m, a positive electrode for a secondary battery and a secondary battery, which are manufactured using the same.

Abstract: The present disclosure relates to a carbon nanotube dispersion including carbon nanotubes, a dispersion medium, and partially hydrogenated nitrile rubber having a residual double bond (RDB) value of 0.5% by weight to 40% by weight calculated according to Mathematical Formula 1, a method for preparing the same, and methods for preparing electrode slurry and an electrode using the same.

Abstract: Provided herein are a positive electrode for a secondary battery and a secondary battery including the same. The positive electrode includes a positive electrode active material layer including a positive electrode active material, a conductive material, and a dispersant, wherein the conductive material includes bundle-type carbon nanotubes, units of which have an average strand diameter of 15 nm or less, and the positive electrode active material layer has a packing density of 3.0 g/cc or more, and has an average pore diameter of 0.1 ?m to 0.5 ?m at the packing density when a pore size distribution is measured by mercury intrusion porosimetry, and thus may exhibit excellent electrolyte wetting properties. As a result, when the positive electrode is applied to a battery, wetting time of the positive electrode is shortened, and an area of the positive electrode that is not filled with an electrolyte is reduced, resulting in enhanced battery performance.

Abstract: The present invention provides: a conductive material dispersed liquid containing a conductive material, a dispersant, and a dispersion medium, wherein the conductive material comprises bundle-type carbon nanotubes having a bulk density in a range of 10-50 kg/m3 and a conductivity satisfying the conditions of Equation 1 below, thereby exhibiting excellent dispersibility and conductivity; and a lithium secondary battery, which is manufactured using the conductive material dispersed liquid and thus can exhibit excellent battery functions, especially, excellent output characteristics at low temperatures: ?X?10 log R??0.6X??[Equation 1] (in Equation 1 above, X is a bulk density of the carbon nanotubes, and R is a powder resistance of the carbon nanotubes under a pressure of 10 to 65 MPa.).