Abstract:
Disclosed herein is an electrode assembly configured to have a structure in which two or more unit cells are sequentially stacked or a structure in which two or more unit cells are folded using a long sheet type separation film, wherein the unit cells include bi-cells, each of which includes a positive electrode, a negative electrode, and a separator, at least one of the bi-cells includes a safety electrode configured such that an electrode active material is applied only to one major surface of an electrode current collector, the safety electrode includes a first surface, to which no electrode active material is applied, and a second surface, to which the electrode active material is applied, and the at least one of the bi-cells including the safety electrode is configured such that a safety separator, having a thickness equivalent to 110% to 220% of a thickness of a separator disposed between a positive electrode and a negative electrode or between a negative electrode and a positive electrode excluding the safety electrode, is added to the first surface and/or the second surface of the safety electrode.
Abstract:
Disclosed herein is a stacked/folded type electrode assembly configured to have a structure in which two or more unit cells, each of which includes a separator disposed between a positive electrode and a negative electrode, each having an electrode mixture including an electrode active material applied to a current collector, are wound using a sheet type separation film, wherein the positive electrode is configured to have a structure in which a positive electrode mixture is coated on an aluminum foil as the current collector and the negative electrode is configured to have a structure in which a negative electrode mixture is coated on a metal foil, other than the aluminum foil, as the current collector, the unit cells include one or more full-cells and/or bi-cells, one of the unit cells located at each outermost side of the electrode assembly is configured such that one outermost electrode of the unit cell is a single-sided electrode, the single-sided electrode being configured such that the electrode mixture is applied only to one major surface of the current collector facing the separator, and the separation film has higher elongation than the separator.
Abstract:
The present invention relates to an electrode slurry coating device and method, wherein the heights of first and second slot die heads for discharging active material can be controlled according to time to improve process efficiency and reduce defect rates when forming an active material layer having a double layer structure.
Abstract:
Disclosed are an electrolyte for lithium secondary batteries including 10 to 50% by weight of a cyclic carbonate compound, and 50 to 90% by weight of a linear ester compound, based on the total weight of a non-aqueous solvent, wherein a content of ethyl propionate of the linear ester compound is 20 to 60% by weight, based on the total weight of the non-aqueous solvent, and a lithium secondary battery including the electrolyte and exhibiting superior low-temperature characteristics.
Abstract:
Disclosed herein is a prismatic battery cell including an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, the electrode assembly having a positive electrode terminal and a negative electrode terminal protruding from at least one side of the positive electrode and the negative electrode, two or more case members coupled to each other so as to have a shape corresponding to the external shape of the electrode assembly such that the case members surround the electrode assembly, the case members having a predetermined opening, through which one surface of the electrode assembly, at least, corresponding to protruding portions of the positive electrode terminal and the negative electrode terminal is exposed, and a cap plate coupled to the opening of the case members in a sealed state.
Abstract:
Disclosed herein is a battery cell including an electrode assembly configured to have a structure in which two or more electrode rolls are stacked in a height direction on the basis of a plane, wherein the electrode rolls have the same size or at least two of the electrode rolls have different sizes, and the electrode rolls having different sizes are stacked to form one or more stepped structures in width and/or height.