Provided is a lithium-ion assembled battery in which two or more single cells are laminated and the DC resistance value between the single cells is low. The assembled battery has two or more single cells including a laminating unit in which a positive electrode current collector, a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector are laminated in order, in the assembled battery, one single cell and the other single cell are laminated such that the positive electrode current collector of the one single cell and the negative electrode current collector of the other single cell are in contact with each other, the positive electrode current collector is made up of a conductive resin layer containing a polyolefin resin (A1) and a conductive carbon filler (B1), the negative electrode current collector is made up of two or more kinds of conductive layers, and the conductive layer disposed on an outer side among the conductive layers in the negative electrode current collector contains the polyolefin resin (A1) and the conductive carbon filler (B1).

There is provided a method of synthesizing a porous carbon-sulfur composite comprising the step of carbonizing a carbon material having a metal-organic framework (MOF) at a temperature of 800-1000° C. to produce a porous carbon, mixing and heating the porous carbon with sulfur to infuse the sulfur (melt diffusion) into the pores of the porous carbon and removing excess sulfur not infused into the pores or present on the surface of the porous carbon. There is also provided a cathode comprising the porous carbon-sulfur composite and a method of preparing the cathode by mixing with conductive carbon and a polymer binder. The cathode finds use in an electrochemical cell comprising a sodium or lithium anode.

The multilayer copper foil includes: a recrystallization active layer disposed on a surface of a substrate; and a recrystallization suppressing layer disposed on a surface of the recrystallization active layer to inhibit recrystallization of the recrystallization active layer, wherein a concentration of impurities within the recrystallization suppressing layer is greater than a concentration of impurities within the recrystallization active layer.

There is provided a positive electrode for an alkaline secondary battery and an alkaline secondary battery having good output properties and cycle life. To that end, a positive electrode (10) for alkaline secondary battery is obtained by laminating a flexible metal substrate (11) having flexibility; a primer layer (12) having conductivity provided on one or both surfaces of the substrate (11); and a positive electrode composite material layer (13) provided on the primer layer (12) and containing a positive electrode active material, a binder resin, and a first conductive material.

Disclosed are a pole plate, cell, and battery. The pole plate includes a current collector and a coating layer formed on at least one surface of the current collector. The coating layer includes a first coating zone and a second coating zone arranged on two sides of the first coating zone. A compaction density of the second coating zone is larger than that of the first coating zone.

A sodium nickel chloride battery for high-performance batteries of electric vehicles and other demanding stationary applications. The battery which permits a current collector with a maximum surface-to-cross-section ratio and simple manufacture thereof as well as simplified electrode filling of the battery includes a cathode-side metallic current collector elongated in a cathode chamber about a central axis that is made of a metal tube with high electrical conductivity and has, in a part of the current collector immersed in a separator, a formed tube section, provided with elements for increasing the surface area of the current collector, and has, at a transition from an unpressed tube section as a filler tube to a pressed tube section, a through-hole opening the filler tube to the outside, so that the filler tube can be used as a filling opening for the porous mixture of the cathode and the secondary electrolyte.

A secondary battery with excellent cycle performance is provided. The secondary battery is an all-solid-state battery including a positive electrode current collector layer, a base film, a positive electrode active material layer, a buffer layer, and a solid electrolyte layer. The base film contains titanium nitride. The positive electrode active material layer contains lithium cobalt oxide. The buffer layer contains titanium oxide. The solid electrolyte layer contains a titanium compound. By using titanium oxide for the buffer layer, a side reaction between the positive electrode active material layer and the solid electrolyte layer can be suppressed, and cycle performance can be improved.

Provided is a surface-treated copper foil in which in order to avoid failures of electronic parts by corrosion, a high bond strength between an electrolytic copper foil and a resin base material can be maintained even when the surface-treated copper foil is exposed to corrosive gases and microparticles, and a method for manufacturing the same. The surface-treated copper foil of the present invention comprises an electrolytic copper foil, a roughened layer covering at least one surface side of the electrolytic copper foil, and a rust preventive layer further covering the roughened layer, wherein the rust preventive layer is at least one surface of the surface-treated copper foil; the rust preventive layer comprises at least a nickel layer; and the thickness of the nickel layer is 0.8 to 4.4 g/m.sup.2 in terms of mass per unit area of nickel; and the noncontact roughness Spd of the rust preventive layer is 1.4 to 2.6 peaks/μm.sup.2 and the surface roughness RzJIS of the rust preventive layer is 1.0 to 2.5 μm. The method for manufacturing the surface-treated copper foil forms the roughened layer having higher roughnesses than the noncontact roughness Spd and surface roughness RzJIS on one surface of the electrolytic copper foil, and thereafter forming the rust preventive layer meeting the predetermined condition.

A negative electrode for lithium secondary batteries and a method of manufacturing the same are provided. The negative electrode includes a negative electrode current collector and a lithiophilic material formed on at least one surface of the negative electrode current collector, wherein the lithiophilic material is an oxidized product of a coating material coated on the negative electrode current collector and includes at least one of a metal or a metal oxide, and an oxide layer is formed on a surface of the negative electrode current collector having the lithiophilic material formed thereon.

A negative electrode for lithium secondary batteries is provided. The negative electrode comprises a negative electrode current collector including a porous structure having an inner pore or a through-hole formed therethrough from an upper surface to a lower surface thereof, wherein a lithiophilic material is applied to a surface of the porous structure or the through-hole excluding a first surface of the negative electrode current collector that faces a positive electrode.