A capacitor and a method for producing a capacitor are disclosed. In an embodiment, the capacitor includes a winding having a cathode foil, an anode foil and separators arranged therebetween, an overlap-free region, wherein the cathode foil does not overlap with the anode foil in the overlap-free region, wherein the overlap-free region adjoins an overlapping region, and wherein the cathode foil overlaps with the anode foil in a lateral direction in the overlapping region, and a cathode contact arranged in the overlap-free region, the cathode contact contacting the cathode foil.

An electrochemical energy storage cell is configured to repeatedly store electrical energy, and includes two electrodes, and at least one reference electrode element to enable determining an electrode potential of at least one of the two electrodes. A rechargeable battery, and in particular to a rechargeable lithium-ion battery, includes the electrochemical energy storage cell, and is configured to supply electrical energy to an electrical load. A method includes determining an electrode potential of at least one of the two electrodes with reference to the at least one reference electrode element.

A capacitor includes an anode foil, a cathode foil, a conductive electrolyte, and a separator between the cathode foil and the anode foil. The conductive electrolyte fills between the cathode foil and the anode foil and contains butyrolactone. The separator includes an aromatic polyamide fiber material. The aromatic polyamide fiber material is non-woven and includes a para-aromatic-polyamide synthetic fiber. The separator has a thickness in a range of about 5 μm to about 20 μm and a density of greater than about 1.0 g/cm.sup.3.

A separator for an electrochemical device includes a first porous coating layer on a first surface of a porous polymer substrate. The first porous coating layer includes inorganic particles and a first binder polymer, and the first porous coating layer has an interstitial volume pore structure. The separator also includes a second porous coating layer on a second surface of the porous polymer substrate. The second porous coating layer includes second inorganic particles and a second binder polymer. The second porous coating layer having a node-filament pore structure. The separator also includes an electrode adhesion layer on a surface of the first porous coating layer opposite to the porous separator substrate. The electrode adhesion layer includes a third binder polymer. The separator for an electrochemical device has high heat resistance and improved adhesive property with electrode. An electrochemical device having the separator is also provided.

A capacitor 1 includes a capacitor element 3 holding solution between an anode foil 5 and a cathode foil 7 that are wound up with a separator 6 in between, a body case 2 for housing the capacitor element 3, and a sealing member 4 for sealing the body case 2. A part of the separator 6 makes contact, at a plurality of points or over an area, with the face of the sealing member 4 facing the capacitor element 3 so as to rest on that face. The solution contains, dissolved in a lipophilic solvent, deterioration preventing agent that solidifies by oxidation. The solution is supplied through the separator 6 to the sealing member 4 and permeates the sealing member 4, so that a coating 17 resulting from the agent solidifying coats the outer face of the sealing member 4, leaving the solution present in the sealing member 4.

A capacitor 1 includes a capacitor element 3 holding solution between an anode foil 5 and a cathode foil 7 that are wound up with a separator 6 in between, a body case 2 for housing the capacitor element 3, and a sealing member 4 for sealing the body case 2. A part of the separator 6 makes contact, at a plurality of points or over an area, with the face of the sealing member 4 facing the capacitor element 3 so as to rest on that face. The solution contains, dissolved in a lipophilic solvent, deterioration preventing agent that solidifies by oxidation. The solution is supplied through the separator 6 to the sealing member 4 and permeates the sealing member 4, so that a coating 17 resulting from the agent solidifying coats the outer face of the sealing member 4, leaving the solution present in the sealing member 4.

Implementations of the present disclosure generally relate to separators, high performance electrochemical devices, such as, batteries and capacitors, including the aforementioned separators, systems and methods for fabricating the same. In one implementation, a separator is provided. The separator comprises a polymer substrate, capable of conducting ions, having a first surface and a second surface opposing the first surface. The separator further comprises a first ceramic-containing layer, capable of conducting ions, formed on the first surface. The first ceramic-containing layer has a thickness in a range from about 1,000 nanometers to about 5,000 nanometers. The separator further comprises a second ceramic-containing layer, capable of conducting ions, formed on the second surface. The second ceramic-containing layer is a binder-free ceramic-containing layer and has a thickness in a range from about 1 nanometer to about 1,000 nanometers.

A separator for at least one of electrochemical energy accumulators or converters includes: a porous substrate with a comb polymer, the comb polymer containing a polymer main chain along several lateral chains that are covalently bonded to the polymer main chain. At least one of the lateral chains has at least one Lewis-acid or Lewis-base functionality.

A device includes an electrode stack including a plurality of conductive anodes, a plurality of conductive cathodes, a plurality of separators arranged between the conductive anodes and the conductive cathodes, and a dielectric material disposed on a surface of each of the conductive anodes. The stack has a top surface, a bottom surface, and an edge extending between the top surface and the bottom surface. A continuous electrically insulating film overlies the edge, peripheral portions of the top surface and peripheral portions of the bottom surface so that a central portion of the top surface and a central portion of the bottom surface are exposed. An electrolyte is disposed between the conductive anodes and the conductive cathodes.

A device includes an electrode stack including a plurality of conductive anodes, a plurality of conductive cathodes, a plurality of separators arranged between the conductive anodes and the conductive cathodes, and a dielectric material disposed on a surface of each of the conductive anodes. The stack has a top surface, a bottom surface, and an edge extending between the top surface and the bottom surface. A continuous electrically insulating film overlies the edge, peripheral portions of the top surface and peripheral portions of the bottom surface so that a central portion of the top surface and a central portion of the bottom surface are exposed. An electrolyte is disposed between the conductive anodes and the conductive cathodes.