Abstract: An anode for a secondary battery comprising an anode current collector and an anode active material layer comprising a first anode active material layer disposed on the anode current collector and a second anode active material layer disposed on the first anode active material layer. A mass loading of the second anode active material layer is greater than a mass loading of the first anode active material layer. The first anode active material comprises first silicon-based active material particles, wherein the content of the first silicon-based active material particles is greater than 0 and less than or equal to 0.1.

Abstract: A cathode for a lithium secondary battery and a lithium secondary battery comprising the cathode are provided. The cathode comprises a cathode current collector, and a cathode active material layer comprising a cathode active material on at least one surface of the cathode current collector. A G value and measured at a surface of the cathode active material layer is less than 2.0.

Abstract: A cathode for a secondary battery and a secondary battery comprising the cathode are provided. The cathode a cathode current collector, and a cathode active material layer on a surface of the cathode current collector which comprises a cathode active material. The cathode active material layer comprises a first plurality of pores having a diameter of 0.08 ?m or less, and a second plurality of pores having a diameter of greater than 0.08 ?m and 1 ?m or less. A ratio of a second porosity to a first porosity is in a range from 1.75 to 3.6.

Abstract: A method for detecting a defect in a battery in a formation process is disclosed. In some implementations, the method includes: charging or discharging at least one battery cell in the formation process; measuring a pressure in the at least one battery cell or a differentiation (dP/dQ) of the pressure with respect to charge when the at least one battery cell is charged or discharged; and generating data on whether the at least one battery cell has a defect based on the differentiation (dP/dQ).

Abstract: A lithium secondary battery, and a method of operating a lithium secondary battery are provided. The lithium secondary battery includes a cathode including a cathode active material layer that includes a lithium-nickel metal oxide, and an anode opposing the cathode. A full width at half maximum ratio or a relative peak area ratio of the lithium secondary battery is 70% or more.

Abstract: In a method for manufacturing an electrode for a lithium secondary battery, an electrode mixture is prepared by mixing an electrode active material and a prepolymer binder including a polyvinylidene fluoride (PVDF)-based polymer. The electrode mixture is dry-coated onto an electrode current collector to form a preliminary electrode active material layer. The preliminary electrode active material layer is roll-pressed. An electric field is applied to the preliminary electrode active material layer to form an electrode active material layer. The electrode for a lithium secondary battery exhibits improved elasticity and ionic conductivity, thereby improving the cycle life characteristics and electrical properties of the secondary battery.

Abstract: A facility and method for manufacturing electrodes are disclosed. The facility for manufacturing electrodes according to an embodiment of the present disclosure may include a first chamber and a second chamber, each of which has a hollow portion formed therein and arranged side by side; an electric field unit, at least a portion of which is located inside the first chamber and configured to generate an electric field; and a heater unit, at least a portion of which is located inside the second chamber.

Abstract: A device for drying electrodes include: a drying chamber having a drying space formed therein and comprising a drying chamber inlet wall and a drying chamber outlet wall that face each other, an inlet chamber located outside the drying chamber and in contact with the drying chamber inlet wall; an outlet chamber located outside the drying chamber and in contact with the drying chamber outlet wall; a roll assembly including a plurality of transport rolls located in the drying space; and a heater assembly configured to provide heat to the drying space, wherein the drying chamber further include a partition located in the drying space to divide the drying space into a first drying space and a second drying space, and the heater assembly include a first heater configured to provide heat to the first drying space and a second heater configured to provide heat to the second drying space.

Abstract: The present disclosure relates to a battery cell including an electrode assembly; a body case including an opening on one surface and accommodating the electrode assembly therein through the opening; a coupling region located adjacent to the opening along at least a portion of a circumference of the opening in one region of the body case; a coupling hole penetrating the body case in the coupling region; a cover portion including a terminal portion electrically connecting the electrode assembly to an outside and coupled to the body case in the coupling region to cover the opening; and an adhesive member cured by being located on an inner side surface of the body case and an outer side surface of the body case in the coupling region through the coupling hole and combining the cover portion and the body case, and a manufacturing method of the battery cell.

Abstract: The present invention provides an apparatus and a method for evaluating performance of a battery and equipment for transporting the battery. The battery performance evaluation apparatus of the present invention includes: a temperature measurement unit for measuring an aging temperature of the battery; a voltage measurement unit for measuring a first open circuit voltage of the battery at the start of aging and measuring a second open circuit voltage of the battery at the end of aging; and a processor for calculating a delta voltage of a voltage drop using a difference between the first open circuit voltage and the second open circuit voltage measured by the voltage measurement unit, and determining normal or defective of the battery based on the delta voltage calculated using the aging temperature measured by the temperature measurement unit and an aging period between measurement times of the first and second open circuit voltage.

Abstract: The present invention provides an apparatus and a method for evaluating performance of a battery and equipment for transporting the battery. The battery performance evaluation apparatus of the present invention includes: a temperature measurement unit for measuring an aging temperature of the battery; a voltage measurement unit for measuring a first open circuit voltage of the battery at the start of aging and measuring a second open circuit voltage of the battery at the end of aging; and a processor for calculating a delta voltage of a voltage drop using a difference between the first open circuit voltage and the second open circuit voltage measured by the voltage measurement unit, and determining normal or defective of the battery based on the delta voltage calculated using the aging temperature measured by the temperature measurement unit and an aging period between measurement times of the first and second open circuit voltage.