Abstract: A cathode for a lithium secondary battery includes a cathode current collector; and a cathode mixture layer on at least one surface of the cathode current collector, wherein the cathode mixture layer includes a first cathode mixture layer on the cathode current collector; and a second cathode mixture layer on the first cathode mixture layer, the first cathode mixture layer and the second cathode mixture layer respectively independently include lithium metal phosphate and lithium transition metal oxide as active materials, a weight of the lithium metal phosphate included in the first cathode mixture layer exceeds a weight of the lithium transition metal oxide, the first cathode mixture layer includes a spherical-type conductive material, and the second cathode mixture a needle-type layer includes conductive material.

Abstract: A cathode for a lithium secondary battery according to an embodiment of the present disclosure includes: a cathode current collector; and a cathode mixture layer on at least one surface of the cathode current collector, and the cathode mixture layer includes: a first cathode mixture layer on the cathode current collector; and a second cathode mixture layer on the first cathode mixture layer, each of the first cathode mixture layer and the second cathode mixture layer independently includes a lithium metal phosphate as an active material, at least one of the first cathode mixture layer and the second cathode mixture layer includes a lithium transition metal oxide as an active material, and a weight of the lithium metal phosphate included in the first cathode mixture layer is greater than or equal to a weight of the lithium metal phosphate included in the second cathode mixture layer.

Abstract: A lithium secondary battery includes a cathode, an anode and non-aqueous electrolyte solution. The cathode includes a cathode active material layer that includes a first cathode active material including lithium metal phosphate particles, and a second cathode active material including lithium transition metal oxide particles. The anode faces the cathode. The non-aqueous electrolyte solution includes an organic solvent and a lithium salt. A weight ratio of the first cathode active material relative to the second cathode active material in the cathode active material layer is in a range from 1.5 to 9. A concentration of the lithium salt in the non-aqueous electrolyte solution exceeds 1 M.

Abstract: A cathode active material for a lithium secondary battery according to embodiments of the present disclosure includes first lithium-transition metal oxide particles containing nickel and having a single particle form, and second lithium-transition metal oxide particles including small-sized lithium-transition metal oxide particles and large-sized lithium-transition metal oxide particles and having a bi-modal distribution. The energy density, cycle life properties, and storage properties of the lithium secondary battery may be improved.

Abstract: A cathode for a secondary battery according to the present disclosure includes: a cathode current collector, and a first cathode active material layer and a second cathode active material layer sequentially stacked on at least one surface of the cathode current collector. The first cathode active material layer includes a lithium transition metal oxide. The second cathode active material layer includes a lithium metal phosphate, a particulate conductive material and a fibrous conductive material. The ratio of the content of the fibrous conductive material to that of the particulate conductive material, based on the total weight of the second cathode active material layer, is 2 to 7.

Abstract: An apparatus and method for detecting a defective battery cell is proposed. The proposed apparatus includes a charger for supplying current to cause a battery cell to maintain a constant voltage, a measurement part for measuring the voltage and current of the battery cell, and a controller for determining whether a defect exists in the battery cell on the basis of the current measured by the measurement part, whereby the defective battery cell may be detected with high accuracy, a time required for the detection may be shortened, and a space required for the detection may also be reduced.

Abstract: A cathode for a lithium secondary battery according to embodiments of the present disclosure includes a cathode current collector, a first cathode active material layer disposed on at least one surface of the cathode current collector and including lithium metal phosphate particles, and a second cathode active material layer disposed on the first cathode active material layer and including lithium-transition metal oxide particles, wherein the content of the lithium-transition metal oxide particles, based on the total weight of the lithium metal phosphate particles and the lithium-transition metal oxide particles, is 20 wt % to 70 wt %.

Abstract: A cathode for a secondary battery according to embodiments of the present disclosure includes a cathode current collector and a cathode active material layer, and the cathode active material layer includes a cathode active material and a binder. The cathode active material includes first particles including lithium iron phosphate. The binder includes a first fluorine-based polymer and a second fluorine-based polymer having a hydrophilic functional group bound to the first fluorine-based polymer.

Abstract: A lithium secondary battery according to the present disclosure may comprise a positive electrode; a negative electrode; and an electrolyte comprising a lithium salt, an organic solvent, and an additive, wherein the organic solvent may comprise ethylene carbonate (EC) and propylene carbonate (PC), wherein the additive may comprise fluoroethylene carbonate (FEC), and a volume ratio of the propylene carbonate to the ethylene carbonate in the organic solvent may be 0.2 or more and less than 4.

Abstract: A cathode for a lithium secondary battery and a lithium secondary battery including the same are provided. The cathode for a lithium secondary battery includes a cathode current collector, a first cathode mixture layer disposed on at least one surface of the cathode current collector, and including a first cathode active material being a lithium transition metal oxide particle having a single-crystal structure, and a second cathode mixture layer disposed on the first cathode mixture layer, and including a second cathode active material being a lithium transition metal oxide particle having a secondary particle structure.

Abstract: An anode according to embodiments of the present disclosure includes an anode current collector, a first anode active material layer which is disposed on at least one surface of the anode current collector, and includes a first silicon-based active material and a first binder including a first rubber-based binder and a first cellulose-based binder. The anode includes a second anode active material layer which is disposed on the first anode active material layer, and includes a second silicon-based active material and a second binder including a second rubber-based binder and a second cellulose-based binder. A weight ratio of the first cellulose-based binder to the first rubber-based binder in the first binder is lower than a weight ratio of the second cellulose-based binder to the second rubber-based binder in the second binder.

Abstract: A cathode for a lithium secondary battery according to the present disclosure includes: a cathode current collector; a first cathode active material layer disposed on at least one surface of the cathode current collector and including first lithium metal oxide particles having a secondary particle structure; and a second cathode active material layer disposed on the first cathode active material layer and including second lithium metal oxide particles having a single particle structure. Each of the first cathode active material layer and the second cathode active material layer includes pores. A ratio of the median pore diameter (D50) of the first cathode active material layer to that of the second cathode active material layer is 2.5 to 4.

Abstract: The present invention provides an anode for a secondary battery, which includes an anode current collector and an anode active material layer which is formed on the anode current collector, and includes a silicon-based active material and a conductive material including single-walled carbon nanotubes. The single-walled carbon nanotube has a Raman R value (a D band peak intensity (Id)/a G band peak intensity (Ig)) of 0.01 to 0.1.

Abstract: The present invention provides an anode for a secondary battery, which includes an anode current collector and an anode active material layer which is formed on the anode current collector, and includes a silicon-based active material and a conductive material including single-walled carbon nanotubes. The single-walled carbon nanotube has a Raman R value (a D band peak intensity (Id)/a G band peak intensity (Ig)) of 0.01 to 0.1.

Abstract: An anode for a secondary battery includes an anode current collector, and an anode active material layer including a first anode active material layer and a second anode active material layer sequentially stacked from a surface of the anode current collector. Each of the first anode active material layer and the second anode active material layer includes a carbon-based active material and a silicon-based active material as an anode active material, and a carbon nanotube as a conductive material. A content of the silicon-based active material in the second anode active material layer is greater than a content of the silicon-based active material in the first anode active material layer. A Raman R value of the carbon nanotube included in the second anode active material layer is smaller than a Raman R value of the carbon nanotube included in the first anode active material layer.

Abstract: The present disclosure relates to a high energy density lithium secondary battery having significantly improved high-temperature storage characteristics and lifespan characteristics, which are problematic when a silicon-based negative electrode active material is applied. Specifically, a lithium secondary battery according to an exemplary embodiment includes a positive electrode; a negative electrode facing the positive electrode and including a silicon-based negative electrode active material; and a non-aqueous electrolyte containing a non-aqueous organic solvent including a di-fluoro-based organic solvent and a lithium salt, wherein a content of the di-fluoro-based organic solvent is 5 to 20 vol % with respect to a total volume of the non-aqueous organic solvent.

Abstract: An anode for a secondary battery includes an anode current collector, a first anode active material layer disposed on at least one surface of the anode current collector and including a first anode active material that includes a first silicon composite oxide, and a second anode active material layer disposed on the first anode active material layer and including a second anode active material that includes a second silicon composite oxide. Each of the first silicon composite oxide and the second silicon composite oxide includes a metal. A BET specific surface area of each of the first silicon composite oxide and the second silicon composite oxide is in a range from 2.0 m2/g to 6.5 m2/g.

Abstract: An anode for a lithium secondary battery includes an anode current collector, and an anode active material layer formed on at least one surface of the anode current collector. The anode active material layer includes a first region adjacent to the anode current collector and a second region spaced apart from the anode current collector in a thickness direction with the first region interposed therebetween. The anode active material layer includes an anode active material including an artificial graphite-based active material and a silicon-based active material having a minimum particle diameter (Dmin) in a range from 1 ?m to 5 ?m. A content of the silicon-based active material based on a total weight of the anode active material included in the second region is greater than a content of the silicon-based active material based on a total weight of the anode active material included in the first region.

Abstract: An anode for a secondary battery includes an anode current collector, and an anode active material layer including a first anode active material layer and a second anode active material layer sequentially stacked from a surface of the anode current collector. Each of the first anode active material layer and the second anode active material layer includes a carbon-based active material and a silicon-based active material as an anode active material, and a carbon nanotube as a conductive material. A content of the silicon-based active material in the second anode active material layer is greater than a content of the silicon-based active material in the first anode active material layer. A Raman R value of the carbon nanotube included in the second anode active material layer is smaller than a Raman R value of the carbon nanotube included in the first anode active material layer.

Abstract: Embodiments of the present invention provide a lithium secondary battery including anode active material layers which have a multi-layered structure and include carbon-based active materials having different contents from each other, thereby improving mechanical stability and battery performance.