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, and methods for fabricating the same. In one implementation, a method of forming a separator for a battery is provided. The method comprises exposing a metallic material to be deposited on a surface of an electrode structure positioned in a processing region to an evaporation process. The method further comprises flowing a reactive gas into the processing region. The method further comprises reacting the reactive gas and the evaporated metallic material to deposit a ceramic separator layer on the surface of the electrode structure.

Implementations of the present disclosure generally relate to separators, high performance electrochemical devices, such as, batteries and capacitors, including the aforementioned separators, and methods for fabricating the same. In one implementation, a method of forming a separator for a battery is provided. The method comprises exposing a metallic material to be deposited on a surface of an electrode structure positioned in a processing region to an evaporation process. The method further comprises flowing a reactive gas into the processing region. The method further comprises reacting the reactive gas and the evaporated metallic material to deposit a ceramic separator layer on the surface of the electrode structure.

The invention relates to a separator for non-aqueous-type electrochemical devices that has been coated with a polymer binder composition having polymer particles of two different sizes, one fraction of the polymer particles with a weight average particle size of less than 1.5 micron, and the other fraction of the polymer particles with a weight average particle size of greater than 1.5 microns. The bi-modal polymer particles provide an uneven coating surface that creates voids between the separator and adjoining electrodes, allowing for expansion of the battery components during the charging and discharging cycle, with little or no increase in the size of the battery itself. The bi-modal polymer coating can be used in non-aqueous-type electrochemical devices, such as batteries and electric double layer capacitors.

Provided are fluorinated block copolymers comprising alternating hard blocks and soft blocks, wherein both said hard and soft blocks comprise vinylidenfluoride (VDF). Also provided is the use of said block copolymers in applications for lithium batteries including an electrochemical cell and a separator for an electrochemical cell which is coated with a composition comprising the fluorinated block copolymers. Further provided is a process for the manufacture of the separator.

Provided are fluorinated block copolymers comprising alternating hard blocks and soft blocks, wherein both said hard and soft blocks comprise vinylidenfluoride (VDF). Also provided is the use of said block copolymers in applications for lithium batteries including an electrochemical cell and a separator for an electrochemical cell which is coated with a composition comprising the fluorinated block copolymers. Further provided is a process for the manufacture of the separator.

According to a manufacturing method of an electrolytic capacitor according to an embodiment, a fiber film, which serves as a separator, is formed on a surface of a substrate, which serves as an electrode, by ejecting a material liquid against the substrate. When the fiber film is formed, thicker fiber is formed at end parts of the substrate in a width direction, compared to a center part of the substrate in the width direction.

According to a manufacturing method of an electrolytic capacitor according to an embodiment, a fiber film, which serves as a separator, is formed on a surface of a substrate, which serves as an electrode, by ejecting a material liquid against the substrate. When the fiber film is formed, thicker fiber is formed at end parts of the substrate in a width direction, compared to a center part of the substrate in the width direction.

A separator for aluminum electrolytic capacitors, the separator being interposed between a pair of electrodes in an aluminum electrolytic capacitor that includes a conductive polymer as a cathode material, where: the separator is composed of fibrillated cellulose fibers and fibrillated synthetic fibers; and a tensile strength decrease rate as expressed by formula (1) with use of a tensile strength after 30-minute humidity control at 20° C. at 65% RH and a tensile strength after 20-minute heat treatment at 270° C. is from 10% to 90%:

(X1−X2)/X1×100  Formula (1): X1: Tensile strength after 30-minute humidity control at 20° C. at 65% RH X2: Tensile strength after 20-minute heat treatment at 270° C.

A separator for aluminum electrolytic capacitors, the separator being interposed between a pair of electrodes in an aluminum electrolytic capacitor that includes a conductive polymer as a cathode material, where: the separator is composed of fibrillated cellulose fibers and fibrillated synthetic fibers; and a tensile strength decrease rate as expressed by formula (1) with use of a tensile strength after 30-minute humidity control at 20° C. at 65% RH and a tensile strength after 20-minute heat treatment at 270° C. is from 10% to 90%:

(X1−X2)/X1×100  Formula (1): X1: Tensile strength after 30-minute humidity control at 20° C. at 65% RH X2: Tensile strength after 20-minute heat treatment at 270° C.