The present disclosure relates to a condenser core configured for surrounding an electrical conductor. The condenser core includes an insulation material and a plurality of electrically conducting capacitive layers for modifying electrical fields formed by a current flowing in the electrical conductor. At least one of the electrically conducting capacitive layers includes a first foil and a second foil. Each of the first and second foils of an outermost capacitive layer is connected with a grounding arrangement for grounding the foils.

A power storage material is made by using a fiber material of cellulose molecules obtained from wood, plant fibers (pulp), and the like, and capable of storing electric power of direct current and alternating current, and an ultra power storage body has the power storage material. A power storage material includes a fiber mainly including a fiber derived from at least any one of wood, plant fibers (pulp), animals, algae, microorganisms, and microbial products, and having a large number of recesses and protrusions on a surface. The fiber is preferably crystallized/amorphous fibers, is preferably an amorphous fiber having an atomic vacancy, and preferably has a specific surface area of 10 m.sup.2/g or more. Preferably, the large number of recesses and protrusions have a diameter of 1 nm to 500 nm. Preferably, the electric resistance is 100 MΩ or more, and the electric capacity is 5 mF/cm.sup.2 or more

A power storage material is made by using a fiber material of cellulose molecules obtained from wood, plant fibers (pulp), and the like, and capable of storing electric power of direct current and alternating current, and an ultra power storage body has the power storage material. A power storage material includes a fiber mainly including a fiber derived from at least any one of wood, plant fibers (pulp), animals, algae, microorganisms, and microbial products, and having a large number of recesses and protrusions on a surface. The fiber is preferably crystallized/amorphous fibers, is preferably an amorphous fiber having an atomic vacancy, and preferably has a specific surface area of 10 m.sup.2/g or more. Preferably, the large number of recesses and protrusions have a diameter of 1 nm to 500 nm. Preferably, the electric resistance is 100 MΩ or more, and the electric capacity is 5 mF/cm.sup.2 or more

Disclosed are a high-temperature capacitive energy storage film having a structure in which graphene fluoride (GF) is sandwiched between aramid nanofibers (ANFs) and a method of manufacturing the same.

A film capacitor preferably includes a single film capacitor layer wound around itself in adjacent layers to form a winding. The film capacitor layer preferably includes a dielectric film, a first metallization layer formed on the dielectric film, a dielectric coating formed on the first metallization layer, and a second metallization layer formed on the dielectric coating. A metallic contact layer is preferably formed on an outer edge of the winding. A terminal is preferably formed on an outer edge of the metallic contact layer. An insulating material preferably encapsulates the winding, the metallic contact layer, and a portion of the terminal. The capacitor as self-healing properties. Further, the border of the electrodes may be wave-cut. Further, an insulating gap may be added between the border and the upper electrode.

A capacitor that includes: a substrate; a fixing layer with a first main surface and a second main surface that face each other, the first main surface being in contact with a surface of the substrate; a plurality of fibrous core materials each having a first embedded in the fixing layer and a second end exposed from the fixing layer; a dielectric layer covering the second end of each of the plurality of fibrous core materials; and a conductor layer covering the dielectric layer, wherein a length of a part of each of the plurality of fibrous core materials embedded in the fixing layer is larger than a distance between a contact between the plurality of fibrous core materials and the second main surface of the fixing layer and the first main surface of the fixing layer.

A capacitor that includes: a substrate; a fixing layer with a first main surface and a second main surface that face each other, the first main surface being in contact with a surface of the substrate; a plurality of fibrous core materials each having a first embedded in the fixing layer and a second end exposed from the fixing layer; a dielectric layer covering the second end of each of the plurality of fibrous core materials; and a conductor layer covering the dielectric layer, wherein a length of a part of each of the plurality of fibrous core materials embedded in the fixing layer is larger than a distance between a contact between the plurality of fibrous core materials and the second main surface of the fixing layer and the first main surface of the fixing layer.

Provided is a separator for aluminum electrolytic capacitors, in which the separator has both good short circuit resistance and good impedance characteristics. A separator for aluminum electrolytic capacitors is formed, in which the separator is interposed between a positive electrode and a negative electrode of an aluminum electrolytic capacitor, and the separator includes at least one layer that is formed from plant fibers and has a dielectric breakdown strength of greater than or equal to 20 kV/mm.

Provided is a separator for aluminum electrolytic capacitors, in which the separator has both good short circuit resistance and good impedance characteristics. A separator for aluminum electrolytic capacitors is formed, in which the separator is interposed between a positive electrode and a negative electrode of an aluminum electrolytic capacitor, and the separator includes at least one layer that is formed from plant fibers and has a dielectric breakdown strength of greater than or equal to 20 kV/mm.

Provided is a separator for an electrochemical element having exceptional strength and shielding performance, a small thickness, and low resistance. A separator for an electrochemical element interposed between a pair of electrodes and capable of holding an electrolytic solution containing an electrolyte, wherein the separator for an electrochemical element comprises a regenerated cellulose fiber having an average fiber length of 0.25-0.80 mm and an average fiber width of 3-35 m, and in which the value calculated by dividing the average fiber length by the average fiber width is 15-70.