An object is to provide an aluminum plate which has favorable adhesiveness and coating properties to active materials and has a high strength and a method for manufacturing an aluminum plate. An average opening diameter of the plurality of through holes is 0.1 m or more and 100 m or less, an average opening ratio of the plurality of through holes is 2% or more and 40% or less, among the plurality of through holes, a percentage of through holes having an opening diameter of 5 m or less is 40% or less, among the plurality of through holes, a percentage of through holes having an opening diameter of 40 m or more is 40% or less, and, among the plurality of through holes, a percentage of through holes in which a ratio S.sub.1/S.sub.0 of an area S.sub.1 of the through holes to an area S.sub.0 of a circle having a long axis of the through hole as a diameter is 0.1 or more and 1 or less is 50% or more.

A method and an apparatus for producing a microporous metal foil comprising (a) passing a metal foil through a gap between a pattern roll having large numbers of high-hardness, fine particles on the surface and a hard roll while pressing, to provide the metal foil with large numbers of fine penetrating pores, with a thin hard plastic film interposed between the metal foil and the pattern roll, and a thick soft plastic film interposed between the metal foil and the hard roll; and (b) adjusting tension applied to each of the metal foil, the hard plastic film and the soft plastic film to such an equal level that the metal foil is not broken during forming the fine penetrating pores.

The present disclosure provides a sheet-form electrode for a secondary battery, comprising a current collector; an electrode active material layer formed on one surface of the current collector; and a first porous supporting layer formed on the electrode active material layer. The sheet-form electrode for a secondary battery according to the present disclosure has supporting layers on at least one surface thereof to exhibit surprisingly improved flexibility and prevent the release of the electrode active material layer from a current collector even if intense external forces are applied to the electrode, thereby preventing the decrease of battery capacity and improving the cycle life characteristic of the battery.

The present disclosure provides a flat metal sheet having a principal surface located on one side along a thickness direction, a plurality of struts, and a node part where end portions of the plurality of struts are connected to one another, wherein the strut and the node part form a mesh structure, and the plurality of the struts are in close contact with each other, and a plurality of through holes penetrating the principal surface in the thickness direction.

A fuel electrode incorporates a first and second corrugated portion that are attached to each other at offset angles respect to their corrugation axis and therefore reinforce each other. A first corrugated portion may extend orthogonally with respect to a second corrugated portion. The first and second corrugated portions may be formed from metal wire and may therefore have a very high volumetric void fraction and a high surface area to volume ratio (sa/vol). In addition, the strands of the wire may be selected to enable high conductivity to the current collectors while maximizing the sa/vol. In addition, the shape of the corrugation, including the period distance, amplitude and geometry may be selected with respect to the stiffness requirements and electrochemical cell application factors. The first and second corrugated portions may be calendared or crushed to reduce thickness of the fuel electrode.

The present invention relates to a secondary battery. The secondary battery comprises an electrode assembly, which comprises: a first electrode in which a first notching part is provided; a second electrode in which a second notching part is provided; a first separator interposed between the first electrode and the second electrode; and a second separator disposed on a lower portion of the second electrode, wherein the electrode assembly is folded in a width direction in a state in which the first electrode, the first separator, the second electrode, and the second separator are sequentially stacked and folded and bent through the first and second notching parts.

There is provided a lithium-ion secondary battery that includes a positive electrode including a sulfur-based positive active material containing at least sulfur and a negative electrode including a silicon-based negative active material containing at least silicon or a tin-based negative active material containing tin, in which lithium ions are easily implanted and moved. There is also provided a method of manufacturing the lithium-ion secondary battery. A positive electrode 3 includes a positive current collector 4 and a sulfur-based positive active material 5 containing at least sulfur (S). A negative electrode 7 includes a negative current collector 8 and a silicon-based negative active material 9 containing at least silicon (Si) or a tin-based negative active material 9 containing tin (Sn). The positive current collector 4 is made of an aluminum foil having a plurality of through holes. The negative current collector 8 is made of a copper foil having a plurality of through holes. The positive electrode 3 and the negative electrode 7 are stacked via a separator 11 to form an electrode group 13.

Provided are a method of preparing an electrode assembly suitable for preparing a secondary battery having a structure that may increase a degree of freedom in the design of a device in which the secondary battery is installed, and a method of preparing a secondary battery.

A battery includes an anode, an electrolyte, and a cathode. The cathode includes a current collector formed from a mesh structure with an opening pattern. The opening pattern does not include any angles less than 90 degrees, and the current collector has a first surface and a second surface opposite the first surface. The cathode also includes a first material layer bonded to the first surface of the current collector, and a second material layer bonded to the second surface of the current collector and to the first material layer through the current collector.

Disclosed are an electrode including a perforated current collector, and a lithium secondary battery including the same, and according to the present disclosure, precipitation and elimination reactions of lithium metal are induced inside a perforation of a negative electrode current collector, and therefore, volume expansion of a cell is suppressed and battery performance is enhanced therefrom.