Abstract: An electrochemical device having an electrode matrix including a multilayer structure laminating positive and negative electrodes with a separator interposed therebetween; wherein at least one of the positive and negative electrodes has a resistance control layer at least at an edge part exposed when the separator thermally shrinks on a surface on the separator side; and wherein the resistance control layer has a resistance value as a total resistance value of the electrode matrix falling in such a range that an estimated internal short circuit current between the positive and negative electrodes is equivalent to 0.09 C to 1 C.

Abstract: An electrode manufacturing apparatus comprises a conveying section for conveying a current collector sheet having a plurality of through holes; a backup roll for guiding the conveyed current collector sheet; an applicator for supplying a coating liquid to the current collector sheet on the backup roll; and a nip roll for pressing a part of the current collector sheet where the coating liquid is not supplied yet from the applicator against the backup roll.

Abstract: According to the present invention, when the electrode for electrochemical devices is fabricated, the treating method for removing off a binder solvent adsorbed to pores in an electrode-constituting activated charcoal or the like, using carbon dioxide in a supercritical state, is used or a method wherein the supercritical-state treating method is modified using a low-boiling solvent is used, whereby the electrostatic capacity of the carbonaceous material as the active substance and the reliability of the electro-chemical device can be improved.

Abstract: An electrochemical device has an armor; a structure housed in the armor and having a separator disposed between first and second electrodes; and external terminals with respective leads connected to the first and second electrodes of the structure, respectively, and extending from the interior of the armor across a sealed portion of the armor to the outside; at least a surface of an intersection in each of the leads crossing the sealed portion is provided with at least one of depressed portion and projected portion. This electrochemical device is realized in compact size and with high reliability.

Abstract: A fiber-containing polymer film contains a host polymer and fibrous substances. The fiber-containing polymer film has an orientation area where the fibrous substances are oriented in a direction substantially parallel to a main surface of the fiber-containing polymer film and in substantially the same direction.

Abstract: A lithium-ion secondary battery separator having a porous structure formed by laminating a second polymer layer, a first polymer layer, and a second polymer layer in sequence. The second polymer layer has a melting point higher than that of the first polymer layer. The second polymer layer has a higher molecular part formed on a side in contact with the first polymer layer and a lower molecular part formed on a side farther from the first polymer layer than is the higher molecular part. The higher and lower molecular parts have a weight-average molecular weight ratio (higher molecular part/lower molecular part) of 4 to 19 therebetween.

Abstract: The present invention provides an electrode producing method capable of uniformly depositing a coating solution on a sheet with projections on a surface. An electrode producing method by an electrode producing apparatus 100 has an inclining step of pressing a surface of a current collector sheet 2A with projections 4a extending outwardly from the surface, which is conveyed in a definite direction, to incline the projections 4a in a direction opposite to the definite direction of the current collector sheet 2A; and an applying step of applying a coating solution 3A onto the current collector sheet 2A the projections of which have been inclined in the inclining step and which is conveyed in the definite direction, by a slit die 12. After the surface of the current collector sheet 2A is pressed to incline the projections 4a on the sheet surface in the opposite direction to the conveyance direction, the coating solution 3A is applied onto the surface.

Abstract: An electrode has a current collector having a plurality of through holes, and active material layers provided on both sides of the current collector, the current collector has projections extending on the top side or on the back side of the current collector from respective edges of the through holes, and an angle between each of the projections and a surface direction of the current collector is in the range of 30 to 80°. Because of the configuration wherein the projections are surrounded by the active material layers, a physical anchor effect is achieved so as to provide high adhesion. Since the projections are inclined relative to the surface direction of the current collector, the distance becomes shorter between the current collector including the projections and an active material, which was located apart from the projections in the case where the projections extended perpendicularly to the surface direction of the current collector.

Abstract: An electrode manufacturing apparatus comprises a conveying section for conveying a current collector sheet having a plurality of through holes; a backup roll for guiding the conveyed current collector sheet; an applicator for supplying a coating liquid to the current collector sheet on the backup roll; and a nip roll for pressing a part of the current collector sheet where the coating liquid is not supplied yet from the applicator against the backup roll.

Abstract: An electrode manufacturing method which can lower the impedance of electrochemical devices is provided. The electrode manufacturing method comprises the steps of applying a coating material containing an active material particle, a binder, and a good solvent for the binder to a current collector, so as to form a coating film made of the coating material; removing the good solvent from the coating film; applying a poor solvent for the binder to the coating film having removed the good solvent; and pressing the coating film coated with the poor solvent.

Abstract: An electrode manufacturing method which can form a flat short-circuit prevention coating film (solid polyelectrolyte layer) having a uniform thickness and prevent short circuits from occurring in an electrochemical device is provided. The electrode manufacturing method comprises a first step of applying an active material layer coating material containing an active material particle, an active material layer binder, and a first solvent to a current collector so as to form a coating film made of the active material layer coating material; a second step of applying a second solvent to the coating film; and a third step of applying a solid polyelectrolyte layer coating material containing a solid polyelectrolyte, a solid polyelectrolyte layer binder, and a third solvent to the coating film coated with the second solvent.

Abstract: An electrochemical device comprises an electrode matrix including a multilayer structure composed of a positive electrode, a negative electrode, and a first separator, and first and second dummy electrodes electrically connected to the positive and negative electrodes, respectively. The first and second dummy electrodes have respective opposing parts opposing each other through a second separator at an outer peripheral part of the electrode matrix. One or each of the first and second dummy electrodes has a resistance control layer at least on a side where the opposing parts oppose each other. The resistance control layer has such a resistance value that an estimated internal short circuit current between the first and second dummy electrodes is equivalent to 0.09 C to 1.00 C. The first and second dummy electrodes are adapted to short-circuit each other at a lower temperature than the positive and negative electrodes do.

Abstract: An electrochemical device having an electrode matrix including a multilayer structure laminating positive and negative electrodes with a separator interposed therebetween; wherein at least one of the positive and negative electrodes has a resistance control layer at least at an edge part exposed when the separator thermally shrinks on a surface on the separator side; and wherein the resistance control layer has a resistance value as a total resistance value of the electrode matrix falling in such a range that an estimated internal short circuit current between the positive and negative electrodes is equivalent to 0.09 C to 1 C.

Abstract: An electrochemical device including a first anode, a first cathode, a single continuous separator provided between the first anode and the first cathode and folded so as to be arranged on the opposite side of the first anode to the first cathode and on the opposite side of the first cathode to the first anode, and an electrolyte in contact with the separator, the first anode and the first cathode, wherein the separator has a shape that surrounds the periphery of the first anode or the first cathode by being folded in the same direction at two folds consecutive from one end of the separator.

Abstract: An electrochemical device has an armor; a structure housed in the armor and having a separator disposed between first and second electrodes; and external terminals with respective leads connected to the first and second electrodes of the structure, respectively, and extending from the interior of the armor across a sealed portion of the armor to the outside; at least a surface of an intersection in each of the leads crossing the sealed portion is provided with at least one of depressed portion and projected portion. This electrochemical device is realized in compact size and with high reliability.

Abstract: According to the present invention, when the electrode for electrochemical devices is fabricated, the treating method for removing off a binder solvent adsorbed to pores in an electrode-constituting activated charcoal or the like, using carbon dioxide in a supercritical state, is used or a method wherein the supercritical-state treating method is modified using a low-boiling solvent is used, whereby the electrostatic capacity of the carbonaceous material as the active substance and the reliability of the electro-chemical device can be improved.

Abstract: In the inventive fabrication process for electrodes for electrochemical devices, when the coating film is rolled so as to increase its density, the given binder solvent is intentionally allowed to remain in an amount good enough to keep pores on the surface of the active substance uncrushed, and after the rolling operation is carried out, the solvent extraction operation is conducted to remove the binder solvent remaining in the pores in the coating film. Thus, an electrochemical device using an electrode according to the inventive fabrication process is much improved in electrostatic capacity as well as in durability and reliability as well.

Abstract: The present invention provides an electrode for an electric double layer capacitor which enhances an adhesive property between an electrode layer and an etched aluminum foil current collector. An electrode for a capacitor, includes a current collector, an undercoat layer on the current collector, and an electrode layer on the undercoat layer, wherein the current collector is made of an aluminum foil; the undercoat layer includes at least electrically conductive particles (P) and a binder (B) in a weight ratio P/B of 0.25 to 2.33, and the binder (B) includes a fluorine-containing polymer as a main component; and the electrode layer includes at least a carbon material and a binder.

Abstract: The present invention provides an electrode for an electric double layer capacitor which is considerably excellent in adhesive property between an electrode layer and an etched aluminum foil current collector. An electrode for a capacitor, which comprises a current collector, an undercoat layer on the current collector, and an electrode layer on the undercoat layer, wherein the current collector is made of an aluminum foil; the undercoat layer comprises at least electrically conductive particles (P) and a binder (B) in a weight ratio P/B of 0.25 to 2.33, and the binder (B) comprises a fluorine-containing polymer as a main component; and the electrode layer comprises at least a carbon material and a binder.