The electric storage device disclosed herein is a stacked type electric storage device. The electric storage device includes a separator insulating a first electrode from a second electrode. The electric storage device includes a first conductive path from a first electrode terminal to the first electrode, a second conductive path from a second electrode terminal to the second electrode, and a current interruption device disposed between the second electrode terminal and the second electrode, the current interruption device being configured to interrupt the second conductive path. The separator includes a first surface part covering the one surface of the first electrode, a second surface part covering the other surface of the first electrode, and a connection part connected to both the first and second surface parts. The connection part is disposed between the current interruption device and an end of the first electrode on a current interruption device side.

The electric storage device disclosed herein is a stacked type electric storage device. The electric storage device includes a separator insulating a first electrode from a second electrode. The electric storage device includes a first conductive path from a first electrode terminal to the first electrode, a second conductive path from a second electrode terminal to the second electrode, and a current interruption device disposed between the second electrode terminal and the second electrode, the current interruption device being configured to interrupt the second conductive path. The separator includes a first surface part covering the one surface of the first electrode, a second surface part covering the other surface of the first electrode, and a connection part connected to both the first and second surface parts. The connection part is disposed between the current interruption device and an end of the first electrode on a current interruption device side.

A capacitor electrode includes a collector, and an electrode layer disposed in contact with the collector and capable of inserting and releasing cations. The electrode layer includes first carbon material particles capable of inserting and releasing cations and second carbon material particles capable of inserting and releasing cations. The average particle diameter of primary particles of the second carbon material particles is smaller than the average particle diameter of primary particles of the first carbon material particles. In the electrode layer, the content amount of the second carbon material particles is smaller than the content amount of the first carbon material particles.

A capacitor electrode includes a collector, and an electrode layer disposed in contact with the collector and capable of inserting and releasing cations. The electrode layer includes first carbon material particles capable of inserting and releasing cations and second carbon material particles capable of inserting and releasing cations. The average particle diameter of primary particles of the second carbon material particles is smaller than the average particle diameter of primary particles of the first carbon material particles. In the electrode layer, the content amount of the second carbon material particles is smaller than the content amount of the first carbon material particles.

Provided are a metal foil, a metal foil manufacturing method and a method for manufacturing an electrode using the same, in which the adhesion between the metal foil and a conductive resin layer and the coating performance of the conductive resin layer can be improved by treating the surface of the metal foil. The metal foil comprises: a metal base substrate; a surface treatment layer formed on at least one surface of the metal base substrate by treating the surface of the metal base substrate; and a conductive resin layer applied to the surface of the surface treatment layer, wherein the surface treatment layer has a surface energy of 34-46 dyne/cm.

The present disclosure further provides an exemplary energy storage device fabricated from rectangular-tube polyaniline (PANI) that is chemically synthesized by a simple and convenient method. The rectangular-tube PANI, as an active material, is synthesized on a functionalized carbon cloth (FCC) as a substrate, and the obtained composite is immobilized on a stainless steel mesh as a current collector. The present disclosure additionally presents a facile technique for the direct synthesis of PANI nanotubes, with rectangular pores, on chemically activated CC.

Provided are a current collector which has an excellent high-rate property and exerts a sufficient safety function when employed in a secondary battery or a capacitor, as well as an electrode, a secondary battery or a capacitor in which said current collector is employed. According to the invention, a current collector is provided which comprises: metal foil; and a conductive layer with a film thickness of 0.1 μm to 10 μm formed on a surface of said metal foil. Here, said conductive layer includes a conductive material and a binder material. A melting point of said binder material is 80° C. to 150° C. Further, said binder material shows, in differential scanning calorimetry (DSC) in a range from room temperature to 200° C., one or more endothermic peaks in the heating-up process. In a case where said binder material shows two or more endothermic peaks, each difference between said peaks is 15° C. or more. Moreover, said binder material shows one or more exothermic peaks in the cooling-down process. In a case where said binder material shows only one exothermic peak, said exothermic peak falls within a range of 50 to 120° C., and a width at half maximum of said exothermic peak is 10° C. or less. On the other hand, in a case where said binder material shows two or more exothermic peaks, a maximum exothermic peak among said exothermic peaks falls within a range of 50 to 120° C., and a width at half maximum of said exothermic peak is 10° C. or less.

Provided are a current collector which has an excellent high-rate property and exerts a sufficient safety function when employed in a secondary battery or a capacitor, as well as an electrode, a secondary battery or a capacitor in which said current collector is employed. According to the invention, a current collector is provided which comprises: metal foil; and a conductive layer with a film thickness of 0.1 μm to 10 μm formed on a surface of said metal foil. Here, said conductive layer includes a conductive material and a binder material. A melting point of said binder material is 80° C. to 150° C. Further, said binder material shows, in differential scanning calorimetry (DSC) in a range from room temperature to 200° C., one or more endothermic peaks in the heating-up process. In a case where said binder material shows two or more endothermic peaks, each difference between said peaks is 15° C. or more. Moreover, said binder material shows one or more exothermic peaks in the cooling-down process. In a case where said binder material shows only one exothermic peak, said exothermic peak falls within a range of 50 to 120° C., and a width at half maximum of said exothermic peak is 10° C. or less. On the other hand, in a case where said binder material shows two or more exothermic peaks, a maximum exothermic peak among said exothermic peaks falls within a range of 50 to 120° C., and a width at half maximum of said exothermic peak is 10° C. or less.

Provided is a process for producing an electrolyte-impregnated laminar graphene structure for use as a supercapacitor electrode. The process comprises (a) preparing a graphene dispersion having multiple isolated graphene sheets dispersed in an electrolyte; and (b) subjecting the graphene dispersion to a forced assembly procedure, forcing the multiple graphene sheets to assemble into an electrolyte-impregnated laminar graphene structure, wherein the multiple graphene sheets are alternately spaced by thin electrolyte layers, less than 5 nm in thickness, and the graphene sheets are substantially aligned along a desired direction, and wherein the laminar structure has a physical density from 0.5 to 1.7 g/cm.sup.3 and a specific surface area from 50 to 3,300 m.sup.2/g, when measured in a dried state of the laminar structure with the electrolyte removed. This process leads to a supercapacitor having a large electrode thickness, high active mass loading, high tap density, and exceptional energy density.

Provided is a process for producing an electrolyte-impregnated laminar graphene structure for use as a supercapacitor electrode. The process comprises (a) preparing a graphene dispersion having multiple isolated graphene sheets dispersed in an electrolyte; and (b) subjecting the graphene dispersion to a forced assembly procedure, forcing the multiple graphene sheets to assemble into an electrolyte-impregnated laminar graphene structure, wherein the multiple graphene sheets are alternately spaced by thin electrolyte layers, less than 5 nm in thickness, and the graphene sheets are substantially aligned along a desired direction, and wherein the laminar structure has a physical density from 0.5 to 1.7 g/cm.sup.3 and a specific surface area from 50 to 3,300 m.sup.2/g, when measured in a dried state of the laminar structure with the electrolyte removed. This process leads to a supercapacitor having a large electrode thickness, high active mass loading, high tap density, and exceptional energy density.