An external terminal for an electric energy storage device, which is coupled to an upper end of a cylindrical metal case to cap the metal case and has a hollow formed at a center thereof so that a safety valve is installed therein, wherein the metal case includes an outer part exposed to the outside in an erect state in a normal direction and an inner part positioned below the outer part, and wherein the inner part includes a first surface adjacent to the hollow and a second surface stepped higher than the first surface (112a) toward the outer part (111).

An external terminal for an electric energy storage device, which is coupled to an upper end of a cylindrical metal case to cap the metal case and has a hollow formed at a center thereof so that a safety valve is installed therein, wherein the metal case includes an outer part exposed to the outside in an erect state in a normal direction and an inner part positioned below the outer part, and wherein the inner part includes a first surface adjacent to the hollow and a second surface stepped higher than the first surface (112a) toward the outer part (111).

A tantalum capacitor includes: first and second surfaces facing in a first direction, third and fourth surfaces facing in a second direction, and fifth and sixth surfaces facing in a third direction; a tantalum body having one surface through which a tantalum wire is exposed in the first direction; and a substrate on which the tantalum body is mounted, wherein the substrate may be an organic-inorganic composite substrate.

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 and a method of making a capacitor, is provided with improved reliability performance. The capacitor comprises an anode; a dielectric on the anode; and a cathode on the dielectric wherein the cathode comprises a conductive polymer and a polyanion wherein the polyanion is a copolymer comprising groups A, B and C represented by Formula A.sub.xB.sub.yC.sub.z as described herein.

A capacitor and a method of making a capacitor, is provided with improved reliability performance. The capacitor comprises an anode; a dielectric on the anode; and a cathode on the dielectric wherein the cathode comprises a conductive polymer and a polyanion wherein the polyanion is a copolymer comprising groups A, B and C represented by Formula A.sub.xB.sub.yC.sub.z as described herein.

An example includes a capacitor case sealed to retain electrolyte, at least one anode disposed in the capacitor case, the at least one anode comprising a sintered portion disposed on a substrate, an anode conductor coupled to the substrate in electrical communication with the sintered portion, the anode conductor sealingly extending through the capacitor case to an anode terminal disposed on the exterior of the capacitor case with the anode terminal in electrical communication with the sintered portion, a second electrode disposed in the capacitor case, a separator disposed between the second electrode and the anode and a second electrode terminal disposed on an exterior of the capacitor case and in electrical communication with the second electrode, with the anode terminal and the second electrode terminal electrically isolated from one another.

An example includes a capacitor case sealed to retain electrolyte, at least one anode disposed in the capacitor case, the at least one anode comprising a sintered portion disposed on a substrate, an anode conductor coupled to the substrate in electrical communication with the sintered portion, the anode conductor sealingly extending through the capacitor case to an anode terminal disposed on the exterior of the capacitor case with the anode terminal in electrical communication with the sintered portion, a second electrode disposed in the capacitor case, a separator disposed between the second electrode and the anode and a second electrode terminal disposed on an exterior of the capacitor case and in electrical communication with the second electrode, with the anode terminal and the second electrode terminal electrically isolated from one another.

A composite oligomeric material includes one or more repeating backbone units; one or more polarizable units incorporated into or connected to one or more of the one or more repeating backbone units; and one or more resistive tails connected to one or more of the repeating backbone units or to the one or more polarizable units as a side chain on the polarizable unit, on a handle linking a polarizable unit to a backbone unit, or directly attached to a backbone unit. The composite oligomer material may be polymerized to form a metadielectric, which may be sandwiched between to electrodes to form a metacapacitor.

A composite oligomeric material includes one or more repeating backbone units; one or more polarizable units incorporated into or connected to one or more of the one or more repeating backbone units; and one or more resistive tails connected to one or more of the repeating backbone units or to the one or more polarizable units as a side chain on the polarizable unit, on a handle linking a polarizable unit to a backbone unit, or directly attached to a backbone unit. The composite oligomer material may be polymerized to form a metadielectric, which may be sandwiched between to electrodes to form a metacapacitor.