Abstract: The present invention relates to a secondary battery that is capable of being improved in safety. Also, the secondary battery according to the present invention comprises a case accommodating an electrode assembly and an electrolyte, a lead part electrically connected to the electrode assembly and extending to the outside of the case, and a current interruption part disposed between the electrode assembly and the lead part to electrically disconnect the electrode assembly from the lead part at a predetermined temperature and a predetermined pressure.

Abstract: The present invention relates to a positive electrode for a secondary battery to improve stability during overcharge, and a lithium secondary battery including the same, and particularly, to a positive electrode for a secondary battery including a positive electrode active material layer formed on a positive electrode collector, wherein the positive electrode active material layer has a double-layer structure which includes a first positive electrode active material layer formed on the positive electrode collector and a second positive electrode active material layer formed on the first positive electrode active material layer, the first positive electrode active material layer includes a first positive electrode active material, a conductive agent, and a gas generating agent generating gas during overcharge, and the second positive electrode active material layer includes a second positive electrode active material, and a lithium secondary battery including the same.

Abstract: The present invention relates to a secondary battery. The secondary battery according to the present invention comprises an electrode assembly in which a positive electrode, a separator, and a negative electrode are alternately combined to be stacked; and a pouch that accommodates the electrode assembly therein. The separator comprises a first separator disposed between the positive electrode and the negative electrode and having a through-hole penetrated in a direction that faces the positive electrode and the negative electrode, and a second separator covering the through-hole of the first separator and having an end connected to the pouch. When an internal gas is generated due to overcharging, the pouch is expanded to allow the second separator to move to open the through-hole of the first separator to cause the positive electrode and the negative electrode to contact each other via the through-hole.

Abstract: An electrode for a rechargeable battery, includes: a primer coating layer including PVdF as a first binder and a conductive material formed on a current collector; and an electrode composite layer including a second binder and an electrode active material formed on the primer coating layer, wherein crystallinity of the first binder is 58 or greater.

Abstract: The present disclosure relates to an electrode for an electrochemical device and a method for manufacturing the same. More particularly, the present disclosure relates to an electrode having a small difference in porosity along the thickness direction of the electrode, and a method for manufacturing the same.

Abstract: The present disclosure provides a test cell for measuring electrode characteristics including an electrode assembly having a first reference electrode, a second reference electrode, and a first electrode, which is a target of characteristic measurement, wherein the electrode assembly is housed and sealed in a pouch type battery case made of a laminate sheet with an electrolyte solution.

Abstract: Disclosed are a secondary battery and a life prediction apparatus thereof. The life prediction apparatus predicts a life of a secondary battery including an electrode assembly, a positive electrode tab, a negative electrode tab, a case and a plurality of reference electrodes. In particular, the life prediction apparatus predicts a residual life of the secondary battery by detecting impedances of different regions of the secondary battery by using the plurality of reference electrodes.

Abstract: Provided are a method for designing an electrode for a lithium secondary battery comprising measuring the electrical conductivity of an electrode with an alternating current to determine whether an electrical path in the electrode has been appropriately formed, and a method for manufacturing an electrode for a lithium secondary battery comprising the same. According to the present invention, it is possible to determine the content of a conductive agent in the electrode using the same.

Abstract: Disclosed is a battery cell having an electrode assembly configured as a structure in which a cathode, an anode, and a separator interposed between the cathode and the anode, wherein a surface or both surfaces of respective electrode current collectors of the cathode and the anode are coated with an electrode mixture including an electrode active material, the cathode and the anode are provided with a first cathode terminal and a first anode terminal respectively serving as external input/output terminals of the battery cell, and at least one of the cathode and the anode is provided with a resistance measurement terminal at a position opposite to the external input/output terminal, for measuring a resistance of an electrode current collector.

Abstract: A positive electrode for a lithium secondary battery includes a positive electrode current collector, a positive electrode active material layer, and a primer layer formed between the positive electrode current collector and the positive electrode active material layer. The primer layer includes lithium carbonate (Li2CO3) particles having two or more different particle diameters, a binder polymer, and a conductive material. The lithium secondary battery attains the overcharge cutoff voltage rapidly by virtue of the gas generated between the positive electrode current collector and the positive electrode active material layer, in an overcharged state. Thus, it is possible to ensure the safety of the lithium secondary battery.

Abstract: Disclosed herein is an electrode for a secondary battery including an electrode mixture layer including an electrode active material on one surface or both surfaces of a current collector, wherein the electrode mixture layer includes a plurality of fine holes recessed toward the current collector from a vertical cross-sectional surface, and each of the fine holes is a horn-shaped hole whose diameter is gradually decreased from the vertical cross-sectional surface toward the current collector in the electrode mixture layer.

Abstract: The present invention relates to a separator for a lithium secondary battery, which includes a porous substrate, and a lithium metal layer formed on one side of the porous substrate, wherein the lithium metal layer is formed on an outer circumferential surface of the porous substrate and has a window frame shape with an empty interior, and a lithium secondary battery including the same.

Abstract: The present invention relates to a positive electrode for a secondary battery to improve stability during overcharge, and a lithium secondary battery including the same, and particularly, to a positive electrode for a secondary battery including a positive electrode active material layer formed on a positive electrode collector, wherein the positive electrode active material layer has a double-layer structure which includes a first positive electrode active material layer formed on the positive electrode collector and a second positive electrode active material layer formed on the first positive electrode active material layer, the first positive electrode active material layer includes a first positive electrode active material, a conductive agent, and a volume expansion resin in which volume expansion occurs at a high temperature during overcharge, and the second positive electrode active material layer includes a second positive electrode active material, and a lithium secondary battery including the same.

Abstract: Disclosed herein are a secondary battery configured to be prevented from catching fire or exploding in a critical situation such as overcharging and a method of preventing the secondary battery from catching fire or exploding. Since a separator including a low melting point material is used, a short circuit in the battery occurs when the battery is abnormally heated, and the resistance of an electrode is increased when the temperature of the battery increases to a predetermined temperature or higher. As a result, a positive temperature coefficient (PTC) material is operated at a stable State of Charge (SoC). Consequently, it is possible to prevent the occurrence of a thermal runaway phenomenon of the battery.

Abstract: An electrode mixture of the present invention comprises: an electrode active material; a binder; and a conductive material. When a cross-section of the electrode mixture is imaged such that a pixel filled 100% with a conductive material among a plurality of divided pixels is considered to be a condensed pixel and a value obtained by counting condensed pixels is considered to be the degree of agglomeration, the degree of agglomeration of a conductive material in the electrode mixture in the depth direction of the electrode mixture has a standard deviation less than 3.0. The electrode mixture as described above includes a conductive material uniformly distributed therein and thus has low electrode resistance. Therefore, the electrode mixture can improve output and lifespan properties of a lithium secondary battery to which the electrode mixture has been applied.

Abstract: The secondary battery includes a case in which a positive electrode lead and a negative electrode lead are provided, wherein the case includes an external layer exposed to the outside, an insulation layer disposed in the case and insulated, a conductive layer stacked between the external layer and the insulation layer, made of a conductive material, and having one side coming into contact with the positive electrode lead and the other side coming into contact with the negative electrode lead, and a safety member disposed at a center of the conductive layer to prevent electricity from flowing through the conductive layer at a predetermined temperature or less and melted at the predetermined temperature or more to allow the electricity to flow through the conductive layer.

Abstract: A secondary battery having improved output characteristics is disclosed. The secondary battery according to the present invention accommodates a cell assembly including a plurality of cells connected in parallel, and an electrolyte together in one package, in which positive electrodes of a plurality of central cells disposed at a central part of the cell assembly have a loading energy density higher than that of positive electrodes of a plurality of side cells disposed at a side part, and the positive electrodes of the central cells have positive electrode material coating layers formed at surfaces thereof, which are thicker than those formed at surfaces of the positive electrodes of the side cells. Preferably, the total resistance of the side cells is lower than the total resistance of the central cells.

Abstract: The present disclosure relates to an electrode for an electrochemical device and a method for manufacturing the same. More particularly, the present disclosure relates to an electrode having a small difference in porosity along the thickness direction of the electrode, and a method for manufacturing the same.

Abstract: A secondary battery comprises: a pouch; an electrode assembly mounted within the pouch and having a structure in which electrodes and separators are alternately laminated, the electrode assembly having a tab connection part in which electrode tabs extending from ends of the electrodes overlap each other; a lead comprising a first lead having one end electrically connected to the tab connection part and a second lead having one end electrically connected to the first lead and the other end extending outside of the pouch, each of the first lead and the second lead being fixed to respective portions of an inner surface of the pouch; an adhesion unit mechanically and electrically coupling the first lead and the second lead to each other; and a high-voltage decomposition material that is configured to generate a gas when a high voltage having a predetermined level or more is applied to the adhesion unit.

Abstract: The present invention relates to a negative electrode and a method for manufacturing the same. Specifically, the present invention provides a negative electrode comprising a current collector, a first active material layer formed on the current collector, and a second active material layer formed on the first active material layer, wherein the first active material layer comprises carbon-based negative electrode active material particles, and the second active material layer comprises silicon nitride. The negative electrode according to the present invention comprises a second active material layer comprising silicon nitride on a first active material layer. Nitrogen of the silicon nitride may react with lithium ions to form lithium nitride.