Abstract: A negative electrode active material including a core, an intermediate layer on a surface of the core, and a shell layer on a surface of the intermediate layer, wherein the core includes a silicon oxide of SiOx (0 <x<2); the intermediate layer includes a lithium silicate, the shell layer includes lithium fluoride (LiF) and the intermediate layer is present in an amount of 5 wt %-15 wt % based on a total weight of the negative electrode active material. Also, a method for preparing the negative electrode active material, and a negative electrode and lithium secondary battery including the same. The negative electrode active material provides excellent initial efficiency and life characteristics.

Abstract: Disclosed is a method for manufacturing a cable-type secondary battery, which includes successively supplying a first electrode member, a separator ribbon and a second electrode member around a rod-shaped winding core, wherein a width of the first electrode member and a width of the second electrode member are respectively smaller than a winding circumference, and a width of the separator ribbon is greater than the winding circumference.

Abstract: Disclosed herein is a method of manufacturing a secondary battery electrode containing a positive temperature coefficient (PTC) material, the method including (a) applying first slurry including a first mixture and a solvent mixed with each other to one surface of a planar current collector to generate a PTC material after drying, (b) applying second slurry including a second mixture, including an electrode active material, and a solvent mixed with each other to the first slurry applied to the current collector, which is in a non-dried state, and (c) drying the first slurry and the second slurry applied to the current collector.

Abstract: The present invention provides a negative electrode for a secondary battery, the negative electrode including a negative electrode current collector, a first negative electrode active material layer located on the negative electrode current collector, and a second negative electrode active material layer located on the first negative electrode active material layer, such that resistance in the electrode is decreased due to an increase in adhesion between the negative electrode current collector and the active material and cohesion between the active materials, thereby significantly improving capacity and lifespan characteristics of a battery, a method of fabricating the same, and a secondary battery including the same.

Abstract: The present invention relates to a negative electrode including an active material layer which includes carbon-based particles having an oxygen content of 700 mg/kg to 1,700 mg/kg, and a secondary battery including the same.

Abstract: Disclosed is an electrode active material for a lithium secondary battery including a first material including a carbon material, a second material of a nanostructure formed on the first material, the second material including at least one selected from a metal and a metalloid capable of reversibly alloying with lithium, and a third material present on a surface of at least one of the first material and the second material to control a side reaction with an electrolyte solution, an electrode including the electrode active material, and a lithium secondary battery having the electrode.

Abstract: The present disclosure provides a cable-type secondary battery which includes: a cable-type electrode assembly comprising an inner electrode and a separation layer surrounding the outer surface of the inner electrode to prevent a short-circuit between electrodes; and a sheet-form outer electrode surrounding the outer surface of the cable-type electrode assembly, and satisfies the mathematical formula of C?W (wherein C is the circumference of the section perpendicular to the longitudinal direction of the cable-type electrode assembly, and W is the width of the sheet-form outer electrode).

Abstract: A method for pre-lithiation of a negative electrode is disclosed, including the steps of: producing a lithium metal laminate which includes i) lithium metal foil; and ii) a buffer layer including carbonaceous material particles, inorganic compound particles, polymer compound particles or their combination, and coated on one surface of the lithium metal foil; producing a negative electrode including a negative electrode current collector, and a negative electrode active material layer formed on at least one surface of the negative electrode current collector; and laminating the lithium metal laminate with the negative electrode in such a manner that the buffer layer of the lithium metal laminate is in contact with the negative electrode active material layer. A lithium metal laminate used for the method is also provided. The pre-lithiation of a negative electrode that includes a buffer layer reduces the problem of rapid volumetric swelling occurring.

Abstract: Disclosed is a positive electrode for a lithium secondary battery which uses a positive electrode active material containing secondary particles with a relatively weak particle strength to improve the adhesion between a positive electrode mixture layer and a current collector, and the positive electrode includes a positive electrode current collector; a primer coating layer including a first polymer binder and a first conductive material, having surface roughness (Ra) of 85 nm to 300 nm and formed on at least one surface of the positive electrode current collector; and a positive electrode mixture layer formed on an upper surface of the primer coating layer and including a positive electrode active material containing secondary particles with a compressive breaking strength of 1 to 15 MPa, a second polymer binder and a second conductive material.

Abstract: An electrode for a lithium secondary battery includes a current collector, primer layer formed on a side of the current collector and includes a first conductive agent, a first binder and a first dispersant. Further, an active material layer is formed on a side of the primer layer disposed opposite to the current collector and includes an active material. Additionally, the lithium secondary battery includes a positive electrode, a negative electrode or both, a separator disposed between the positive electrode and the negative electrode and an electrolyte. The structural stability and adhesion of the electrode is improved, a ratio of a binder in the active material layer is reduced and the internal resistance is reduced.

Abstract: Disclosed is a multilayer cable-type secondary battery including a first electrode assembly comprising one or more first inner electrodes and a sheet-type first separation layer-outer electrode complex spirally wound to surround outer surfaces of the first inner electrodes, a separation layer surrounding the first electrode assembly to prevent short circuit of the electrodes, and a second electrode assembly comprising one or more second inner electrodes surrounding an outer surface of the separation layer and a sheet-type second separation layer-outer electrode complex spirally wound to surround outer surfaces of the second inner electrodes.

Abstract: A negative electrode for a secondary battery, and a method for manufacturing the same, and more particularly, to a negative electrode for a secondary battery used for a negative electrode of a secondary battery, and a method for manufacturing the same. A negative electrode for a secondary battery may include a carbon-based active material; a conductive material; a silicon-based active material-polymer binder combination including a silicon-based active material, and a polymer binder for suppressing the expansion of the silicon-based active material bonded to a particle surface of the silicon-based active material; a thickener; and a water-based binder.

Abstract: The present disclosure relates to a cable-type secondary battery having improved performance and capable of alleviating stress caused by external force. The present disclosure provides provided a sheet-type electrode assembly which includes: an electrode array including an inner electrode, a first separator, a double-sided electrode, a second separator and an outer electrode stacked successively; and a support layer formed integrally on at least one surface of the electrode array by compression, and a cable-type secondary battery including the same.

Abstract: A negative electrode for a secondary battery, and a method for producing the same, and more particularly, to a negative electrode for a secondary battery used for a negative electrode of a secondary battery, and a method for producing the same. A negative electrode for a secondary battery may include a carbon-based active material; a conductive material; and a silicon-based active material-polymer binder combination including a silicon-based active material, and a polymer binder for suppressing the expansion of the silicon-based active material bonded to a particle surface of the silicon-based active material.

Abstract: Provided is a multilayer cable-type secondary battery including: a first electrode assembly including one or more first inner electrodes, a first separation layer surrounding outer surfaces of the first inner electrodes to prevent short circuit of electrodes and a sheet-type first outer electrode spirally wound to surround the first separation layer; a third separation layer surrounding the first electrode assembly to prevent short circuit of electrodes; and a second electrode assembly including one or more second inner electrodes surrounding an outer surface of the third separation layer, a second separation layer surrounding outer surfaces of the second inner electrodes to prevent short circuit of electrodes and a sheet-type second outer electrode spirally wound to surround the second separation layer.

Abstract: Disclosed is a battery cell having an electrode assembly that is sealed with an electrolyte solution within a battery case, the electrode assembly including one or more positive electrodes to which a positive electrode terminal is connected; one or more first negative electrodes to which a first negative electrode terminal is connected; one or more second negative electrodes to which a second negative electrode terminal is connected; and a separator disposed between the positive electrode and the first negative electrode or second negative electrode, or a separator disposed between the positive electrode and the first negative electrode or second negative electrode and a separator disposed between the first negative electrode and the second negative electrode.

Abstract: Disclosed is a negative electrode for a lithium secondary battery having excellent electric conductivity and adhesion even though a high-loading negative electrode is used, and the negative electrode includes a negative electrode current collector; a first negative electrode mixture layer containing a first negative electrode active material, a first polymer binder and a first conductive material and formed on at least one surface of the negative electrode current collector; and a second negative electrode mixture layer containing a second negative electrode active material, a second polymer binder and a second conductive material and formed on an upper surface of the first negative electrode mixture layer, wherein the first negative electrode active material contains natural graphite and silicon oxide, and the second negative electrode active material contains artificial graphite.

Abstract: A positive electrode for a lithium secondary battery includes a positive electrode current collector; a lower positive electrode active material layer disposed on at least one surface of the positive electrode current collector; and an upper positive electrode active material layer disposed on the lower positive electrode active material layer, wherein the lower positive electrode active material layer includes 90% or more of a sphere-type carbonaceous conductive material as a conductive material, the upper positive electrode active material layer includes 90% or more of a needle-type carbonaceous conductive material as a conductive material, and the content of the conductive material contained in the lower positive electrode active material layer is larger than the content of the conductive material contained in the upper positive electrode active material layer.

Abstract: Disclosed is a negative electrode active material for secondary batteries having improved lifespan characteristics. In particular, provided is a negative electrode active material, for secondary batteries, including silicon (Si), and amorphous hard carbon or low-crystalline soft carbon.

Abstract: The present invention relates to a packaging for a cable-type secondary battery extending longitudinally, comprising: a hollow metal foil layer; a first polymer resin layer formed on one surface of the metal foil layer; and a second polymer resin layer formed on the other surface of the metal foil layer, and a cable-type secondary battery comprising the packaging. The packaging of the present invention comprises a metal foil layer to prevent the contamination of an electrolyte in the cable-type battery and prevent the deterioration of battery performances, and also maintain the mechanical strength of the cable-type battery.