Abstract: A secondary battery including an electrode assembly and a pouch configured to accommodate the electrode assembly. The pouch includes two first covers provided on both surfaces of the electrode assembly in a thickness direction and two second covers provided on both surfaces of the electrode assembly in a full-width direction. The edge surfaces of the first covers and the second covers are sealed by a first sealing part, and the end surfaces of the first covers and the second covers are sealed by a second sealing part. The two second covers are in close contact with both the surfaces of the electrode assembly in the full-width direction.

Abstract: An electrode drying apparatus and a method of manufacturing an electrode using the same is provided. In the electrode drying apparatus, by inducing static electricity onto a back side of an electrode current collector of which a front surface is coated with an electrode slurry so that the electrode slurry has an electric charge opposite to an electric charge of an ionic binder contained in the electrode slurry as a binder, even when solvent volatilization occurs during a drying process of the electrode slurry, it is possible to prevent binders from being moved to a surface of the electrode slurry, and thus it is possible to improve an adhesive force between an electrode mixture layer formed by drying the electrode slurry and the electrode current collector.

Abstract: A positive electrode for a lithium secondary battery comprising a multilayer structure of electrode active materials. The first positive electrode active material layer comprising a positive electrode active material particles and a conductive material on at least one surface of the current collector. The second positive electrode active material layer positioned on the first positive electrode active material layer and comprising positive electrode active material particles and a conductive material.

Abstract: A positive electrode for a lithium secondary battery and a lithium secondary battery including the same, and a method of making the same are disclosed herein. In some embodiments, a positive electrode includes a current collector, a first mixture layer, and a second mixture layer that are sequentially stacked, wherein the first mixture layer includes a first binder composed of a rubber-based resin, and wherein the second mixture layer includes a second binder composed of a fluorine-based resin derived from a fluorine (F)-containing monomer. By using a first binder exhibiting more hydrophobicity than a second binder adhesive strength between a positive electrode current collector and the mixture layer, and durability of the positive electrode, can be improved. When the first mixture layer contains a positive electrode additive, damage to the positive electrode can be minimized, and the electrical performance and lifetime of the lithium secondary battery can be improved.

Abstract: Provided is a positive electrode for a lithium secondary battery with improved structural stability, a manufacturing method thereof, and a lithium secondary battery including the same. When the positive electrode containing a positive electrode additive is manufactured, the conditions of first and second rolling operations are controlled so that there is an advantage in that structures and electrical properties of a first mixture layer and a second mixture layer can be improved.

Abstract: Provided is a positive electrode for a lithium secondary battery and a lithium secondary battery including the same, wherein the positive electrode is manufactured by using a pre-dispersion containing a positive electrode additive represented by Chemical Formula 1 and a conductive material having a linear structure in a positive electrode mixture layer as an irreversible additive and, by adjusting the electrode sheet resistance to satisfy a specific range, it is possible to reduce the amount of oxygen gas generated during charging and discharging, as well as easily improve the charging and discharging efficiency of the lithium secondary battery.

Abstract: The present technology relates to a positive electrode additive for a lithium secondary battery and a positive electrode for a lithium secondary battery including the same, wherein the positive electrode additive contains a carbon material on a surface of a lithium cobalt oxide represented by Chemical Formula 1 to improve the low electrical conductivity of the positive electrode additive, and an effect of improving the problem caused by the amount of gases generated during initial charging and discharging (i.e., “activation”) is excellent, and thus a positive electrode and lithium secondary battery including the positive electrode additive have excellent electrical performance.

Abstract: An electrode assembly for a lithium secondary battery and a positive electrode for the lithium secondary battery including the electrode assembly. By controlling a ratio (CRLip/CRSi) between a content percentage of a positive electrode additive and a silicon (Si)-containing material that is a negative electrode active material, which are contained in a positive electrode mixture layer and a negative electrode mixture layer, respectively, to a specific range, the electrode assembly has an advantage in that high charging/discharging capacity and charging/discharging efficiency can be realized during initial charging/discharging, a capacity retention rate can be excellent during subsequent charging/discharging, and a lithium secondary battery including the electrode assembly can exhibit a high energy density and long lifetime.

Abstract: The present disclosure relates to aA negative electrode for a lithium secondary battery and a lithium secondary battery including the same, wherein the negative electrode includes a negative electrode active material which contains a carbon material and a silicon material, contains Si in a specific content, and has a form and/or structure in which the size of each material is controlled so that it is possible to improve the charging/discharging capacity and efficiency of the negative electrode, suppress the side reaction between the negative electrode active material and the electrolyte during the charging and discharging while solving a problem of the negative electrode mixture layer peeling due to the expansion and contraction of the negative electrode active material.

Abstract: A master batch for a positive electrode additive and a positive electrode slurry for a lithium secondary battery that contains the same, wherein the master batch contains a high content of irreversible additive together with a positive electrode active material so that a small amount of irreversible additive is dispersed in the positive electrode slurry with high dispersion without loss when a positive electrode is manufactured, and thus a positive electrode for a lithium secondary battery manufactured using the irreversible additive has high electrical properties and reliability, and a degree of freedom in design is improved when the positive electrode is manufactured.

Abstract: Provided is a positive electrode for a lithium secondary battery and a lithium secondary battery including the same, and the positive electrode contains a positive electrode additive represented by Formula 1 and a positive electrode mixture layer including a region with a needle-shaped crack structure in its cross-section after initial charging (activation), so an amount of gas such as oxygen generated by an irreversible additive, which is a positive electrode additive, during the subsequent charging/discharging is reduced, and the migration path of lithium ions and/or electrons is able to be ensured. Therefore, an excellent effect of improving the battery safety and electrical performance of a lithium secondary battery is exhibited.

Abstract: Provided is a lithium secondary battery comprising an electrolyte and an electrode assembly, wherein the electrode assembly comprises a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The positive electrode comprises a positive electrode current collector and a positive electrode mixture layer positioned on the positive electrode current collector, wherein the positive electrode mixture layer comprises a positive electrode active material, a positive electrode additive represented by Chemical Formula 1 (LipCo(1-q)M1qO4), a conductive material, and a binder. The lithium secondary battery satisfies Expression 1 (ALCO/A0) with 2.0 or more and 20.0 or less after charging to a state of charge (SoC) of 100% in an activation process under conditions of a voltage of 3.5 V to 4.5 V and a current of 0.1 to 0.5 C.

Abstract: A vent includes a gas inlet configured to allow gas to be introduced therethrough, a gas outlet configured to allow the gas introduced through the gas inlet to be discharged to the outside therethrough, an alarm means provided at one side of the gas outlet, the alarm means being configured to generate sound when the gas is discharged to the outside, a connection portion configured to connect the gas inlet and the gas outlet to each other, and a sealing cap located in the connection portion, the sealing cap being configured to automatically discharge gas to the outside, whereby gas generated in a battery cell or a battery module is automatically discharged to the outside.

Abstract: Provided is a positive electrode slurry for a positive electrode for a lithium secondary battery, which is manufactured using the same. The positive electrode slurry is composed of a two-liquid type composition, contains the positive electrode additive represented by Chemical Formula 1 (LipCo(1-q)M1qO4), which is used as an irreversible additive, in a large amount, and contains the first liquid whose viscosity is adjusted within a specific range (i.e. 5,000 to 8,000 cps). Thus, not only is there an advantage in that the dispersibility and workability of the positive electrode additive are excellent, but also since it is possible to suppress side reactions while minimizing the loss of the positive electrode additive contained in the positive electrode slurry, the state stability of the positive electrode slurry can be improved, and thus the electrical properties of the positive electrode manufactured using the positive electrode slurry are excellent.

Abstract: Provided are a positive electrode including a positive electrode additive, a method of manufacturing the positive electrode, and a lithium secondary battery including the positive electrode. A coating temperature of a slurry is adjusted when the positive electrode is manufactured, and thus the deformation of the positive electrode additive due to temperature is minimized, and accordingly, structural deformation of the positive electrode additive included in the positive electrode is prevented.

Abstract: Disclosed is a battery cell, a battery module, a battery pack, and a vehicle. The battery cell may include a venting guide unit to discharge a venting gas in a desired direction and from a desired location of a cell case of the battery when a thermal event occurs. The battery cell may include an electrode assembly and an electrode lead connected to the electrode assembly. The cell case may be configured to accommodate the electrode assembly therein and support the electrode lead. The venting guide unit provided to the cell case may be configured to guide a venting gas to be discharged to a predetermined region of the cell case as an internal pressure of the cell case increases.

Abstract: An electrode assembly having a high energy density and a lithium secondary battery including the same are disclosed herein. The electrode assembly includes a positive electrode in which a positive electrode mixture layer includes a positive electrode active material and a positive electrode additive and a negative electrode in which a negative electrode mixture layer includes graphite mixed with silicon (Si)-containing particles. The amount of gas generated during charging and discharging of a battery is reduced, the resistance change rate of the electrode is low even after charging and discharging, and accordingly, a lithium secondary battery including the electrode assembly has a high energy density, a long lifetime, and good quick charging efficiency.

Abstract: Provided are a cathode active material including lithium transition metal phosphate particles, including a first secondary particle formed by agglomeration of two or more first primary particles, and a second secondary particle formed by agglomeration of two or more second primary particles in the first secondary particle, and a method of preparing the same. Since the cathode active material may include first and second primary particles having different average particle diameters, the exfoliation of the cathode active material from a cathode collector may be minimized and performance characteristics, such as high output characteristics and an increase in available capacity, of a secondary battery may be further improved.

Abstract: Provided is a lithium nickel complex oxide represented by Chemical Formula 1: LiwNiIIx1NiIIIx2MnyCozFdO2-d??<Chemical Formula 1> where x1+x2+y+z=1, 0.4?x1+x2?0.9, 0<y?0.6 and 0<z?0.6, 0.9?w?1.3, and 0<d?0.3.

Abstract: Disclosed are a cathode active material for lithium secondary batteries including lithium-containing metal oxide particles; a first surface treatment layer formed on the surfaces of the lithium-containing metal oxide particles and including at least one compound selected from the group consisting of fluorine-doped metal oxides and fluorine-doped metal hydroxides; and a second surface treatment layer formed on a surface of the first surface treatment layer and including a fluorine copolymer, and a method of manufacturing the same.