Abstract: The present disclosure relates to a plurality of host materials, organic electroluminescent compounds, and organic electroluminescent devices comprising the same. By comprising specific combinations of compounds according to the present disclosure as the plurality of host materials or by comprising a compound according to the present disclosure, it is possible to provide organic electroluminescent devices having improved lifespan characteristics compared to conventional organic electroluminescent devices.

Abstract: A method for manufacturing a secondary battery includes: assembling an electrode assembly having a plurality of electrodes separated by at least one separator positioned between each of the electrodes; sealing the electrode assembly and an electrolyte solution in a battery case; and dissolving at least a portion of an adhesive into the electrolyte solution such that a mark from the adhesive is left on the separator. The step of assembling the electrode assembly includes adhering a first one of the plurality of electrodes to the at least one separator with the adhesive positioned between the first electrode and the separator. A secondary battery manufactured by such method is also provided.

Abstract: A method for manufacturing a secondary battery includes: assembling an electrode assembly having a plurality of electrodes separated by at least one separator positioned between each of the electrodes; sealing the electrode assembly and an electrolyte solution in a battery case; and dissolving at least a portion of an adhesive into the electrolyte solution such that a mark from the adhesive is left on the separator. The step of assembling the electrode assembly includes adhering a first one of the plurality of electrodes to the at least one separator with the adhesive positioned between the first electrode and the separator. A secondary battery manufactured by such method is also provided.

Abstract: A secondary battery comprises: an electrode assembly having electrodes, a separator interposed between the electrodes, and electrode tabs; an electrode lead coupled to the electrode tabs; and a pouch configured to accommodate the electrode assembly therein, wherein the electrode tabs comprise a connection part connected to the electrodes, a coupling part coupled to the electrode lead in a state of being combined into a mass, and a bent part provided between the connection part and the coupling part, and the bent part comprises a first bent surface connected to the coupling part and bent at a first-b angle, a second bent surface connected to the connection part and bent at a second-b angle, and a connection surface configured to connect the first bent surface to the second bent surface, wherein the first-b angle is greater than the second-b angle.

Abstract: A secondary battery comprises an electrode assembly comprising radical units in which first and second electrodes are alternately laminated with a separator therebetween and a separation film surrounding the radical units to be repeatedly laminated, wherein the electrode assembly comprises a protection unit laminated on an outermost separation film disposed on the uppermost end or lowermost end of the separation film, the protection unit has a structure comprising a second protection electrode, a separator, and a first protection electrode which are successively laminated from the outermost separation film disposed on the uppermost end or lowermost end of the electrode assembly, the second protection electrode has a cross-sectional coating structure comprising a second collector and a second electrode active material portion coated with a second electrode active material on an inner surface of the second collector, and the inner surface is a surface facing a center of the electrode assembly.

Abstract: The present disclosure relates to an electrode assembly. The electrode assembly can include a coating portion coated with an electrode active material and an electrode provided with an electrode tab without the electrode active material. The electrode can include a crack spreading prevention part, The crack spreading prevention part can include a crack spreading prevention hole formed in the electrode and an insulating coating layer provided on a circumferential surface of the crack spreading prevention hole.

Abstract: A method for manufacturing a secondary battery includes: assembling an electrode assembly having a plurality of electrodes separated by at least one separator positioned between each of the electrodes; sealing the electrode assembly and an electrolyte solution in a battery case; and dissolving at least a portion of an adhesive into the electrolyte solution such that a mark from the adhesive is left on the separator. The step of assembling the electrode assembly includes adhering a first one of the plurality of electrodes to the at least one separator with the adhesive positioned between the first electrode and the separator. A secondary battery manufactured by such method is also provided.

Abstract: A secondary battery comprises an electrode assembly comprising radical units in which first and second electrodes are alternately laminated with a separator therebetween and a separation film surrounding the radical units to be repeatedly laminated, wherein the electrode assembly comprises a protection unit laminated on an outermost separation film disposed on the uppermost end or lowermost end of the separation film, the protection unit has a structure comprising a second protection electrode, a separator, and a first protection electrode which are successively laminated from the outermost separation film disposed on the uppermost end or lowermost end of the electrode assembly, the second protection electrode has a cross-sectional coating structure comprising a second collector and a second electrode active material portion coated with a second electrode active material on an inner surface of the second collector, and the inner surface is a surface facing a center of the electrode assembly.

Abstract: A secondary battery comprises an electrode assembly comprising radical units in which first and second electrodes are alternately laminated with a separator therebetween and a separation film surrounding the radical units to be repeatedly laminated, wherein the electrode assembly comprises a protection unit laminated on an outermost separation film disposed on the uppermost end or lowermost end of the separation film, the protection unit has a structure comprising a second protection electrode, a separator, and a first protection electrode which are successively laminated from the outermost separation film disposed on the uppermost end or lowermost end of the electrode assembly, the second protection electrode has a cross-sectional coating structure comprising a second collector and a second electrode active material portion coated with a second electrode active material on an inner surface of the second collector, and the inner surface is a surface facing a center of the electrode assembly.

Abstract: A method for manufacturing a secondary battery, having an activation process, in which charging/discharging and aging are performed, according to the present invention comprises: a step of providing a first cell and a second cell, each of which has a structure in which an electrode assembly is embedded in a pouch, and a negative electrode lead and a positive electrode lead protrude to the outside of the pouch; a step of stacking the first cell and the second cell; and a step of bonding the positive electrode leads of the first and second cells to each other and bonding the negative electrode leads of the first and second cells to each other, wherein each of the first and second cells is individually activated before the step of providing the first cell and the second cell.

Abstract: The electrode assembly comprises a first electrode unit in which an electrode and a separator are alternately stacked and a second electrode unit in which an electrode and a separator are alternately stacked, the second electrode unit having a size less than that of the first electrode unit and being stacked on the first electrode unit, wherein a tab bonding body manufactured by connecting an electrode tab provided in the first electrode unit to an electrode tab provided in the second electrode unit is disposed within a range of a width of the second electrode unit, and a leading electrode tab to which an electrode lead is connected is disposed on a portion of the first electrode unit.

Abstract: A secondary battery comprises an electrode assembly comprising radical units in which first and second electrodes are alternately laminated with a separator therebetween and a separation film surrounding the radical units to be repeatedly laminated, wherein the electrode assembly comprises a protection unit laminated on an outermost separation film disposed on the uppermost end or lowermost end of the separation film, the protection unit has a structure comprising a second protection electrode, a separator, and a first protection electrode which are successively laminated from the outermost separation film disposed on the uppermost end or lowermost end of the electrode assembly, the second protection electrode has a cross-sectional coating structure comprising a second collector and a second electrode active material portion coated with a second electrode active material on an inner surface of the second collector, and the inner surface is a surface facing a center of the electrode assembly.

Abstract: The electrode assembly comprises a first electrode unit in which an electrode and a separator are alternately stacked and a second electrode unit in which an electrode and a separator are alternately stacked, the second electrode unit having a size less than that of the first electrode unit and being stacked on the first electrode unit, wherein a tab bonding body manufactured by connecting an electrode tab provided in the first electrode unit to an electrode tab provided in the second electrode unit is disposed within a range of a width of the second electrode unit, and a leading electrode tab to which an electrode lead is connected is disposed on a portion of the first electrode unit.

Abstract: Disclosed herein is a battery cell configured to have a structure in which an electrode assembly that can be charged and discharged is mounted in a plate-shaped battery case, a cathode terminal and an anode terminal protrude from one end of the battery case, the electrode terminals deviate to one side from a vertical central axis of a battery body when viewed from above, and a depressed portion is formed at one side of the battery body.

Abstract: Disclosed herein is a battery cell configured to have a structure in which an electrode assembly including a separator disposed between a cathode and an anode is mounted in a battery case, wherein an asymmetric structure with respect to a central axis crossing the electrode assembly in plane is formed at a portion of at least one side of the electrode assembly constituting the outer circumference of the electrode assembly.

Abstract: Provided is a jelly-roll type electrode assembly pattern-coated with active materials manufactured by winding and compressing a separator and an anode and a cathode arranged on both sides of the separator. The anode includes anode flat coated portion coated with an anode active material and anode curved uncoated portion not coated with the anode active material, which are alternately formed. The cathode includes a cathode flat coated portion coated with a cathode active material and a cathode curved uncoated portion not coated with the cathode active material, which are alternately formed.

Abstract: Provided is a secondary battery with improved safety through filling a polymer in a hardened state, and a method of manufacturing the same. The method of manufacturing a secondary battery according to the present disclosure includes preparing a polymer slurry by adding a polymer particle to an electrolyte solution, injecting the polymer slurry to a battery casing in which an electrode assembly is received, changing the polymer slurry to a polymer solution by heating the battery casing, and hardening the polymer solution by cooling the battery casing.

Abstract: Disclosed herein is a battery cell configured to have a structure in which an electrode assembly including a separator disposed between a cathode and an anode is mounted in a battery case, wherein an asymmetric structure with respect to a central axis crossing the electrode assembly in plane is formed at a portion of at least one side of the electrode assembly constituting the outer circumference of the electrode assembly.

Abstract: Provided is a jelly-roll type electrode assembly pattern-coated with active materials manufactured by winding and compressing a separator and an anode and a cathode arranged on both sides of the separator. The anode includes anode flat coated portion coated with an anode active material and anode curved uncoated portion not coated with the anode active material, which are alternately formed. The cathode includes a cathode flat coated portion coated with a cathode active material and a cathode curved uncoated portion not coated with the cathode active material, which are alternately formed.

Abstract: Disclosed herein is a battery cell configured to have a structure in which an electrode assembly, including cathodes, anodes, and separators disposed respectively between the cathodes and the anodes, is mounted in a battery case and in which a cathode terminal and an anode terminal protrude from a first outer circumference of the battery case and a second outer circumference of the battery case opposite to the first outer circumference of the battery case is curved when viewed from above.