Tdk Corporation

Yousuke Miyaki

Kiyonori Hinoki

Kazuo Katai

Hideki Tanaka

Tetsuya Takahashi

Hitoshi Arai

Keiji Koga

Atsuko Kosuda

Kazuya Ogawa

Tsuneo Kagotani

Tadashi Suzuki

Hisashi Suzuki

Katsuo Naoi

Eiji Horigome

Kazutoshi Emoto

Seiichi Endo

Masayoshi Hirano

Tsuyoshi Ichiki

Daisuke Nakazato

Hitoshi Maro

Yuukichi Morita

Masanori Kaya

An electrode is provided as one capable of achieving further improvement in safety of an electrochemical device when exposed to a high-temperature environment, and an electrochemical device is provided as one using the electrode. The electrode has a current collector, an endothermic material layer provided on the current collector, and an active material layer provided on the endothermic material layer. The endothermic material layer contains an endothermic material absorbing heat at 80&#xb0; C. or higher in a differential scanning calorimetry curve thereof.

Electrode and electrochemical device

An electrode has a current collector, and an active material-containing layer provided on the current collector and containing active material particles and ceramic particles, and a weight concentration of the ceramic particles to the active material particles in a surface part in the active material-containing layer on the opposite side to the current collector is higher than a weight concentration of the ceramic particles to the active material particles in a lower part in the active material-containing layer on the current collector side. Furthermore, the thickness of the surface part is not less than 30% nor more than 60% of the total thickness of the surface part and the lower part.

A method of manufacturing a lithium-ion secondary battery positive electrode comprises a coating material preparing step of preparing a positive electrode active material layer forming coating material by mixing a positive electrode active material, a binder, a conductive auxiliary, an organic solvent, and water; and an active material layer forming step of forming a positive electrode active material layer on a current collector by using the positive electrode active material layer forming coating material. The binder is polyvinylidene fluoride produced by emulsion polymerization. The positive electrode active material layer forming coating material is prepared in the coating material preparing step such that the amount of water added (% by mass) based on the total amount of the organic solvent and water and the pH of the positive electrode active material satisfy the following expression (1):48&#x2266;[the amount of water added+(4.25&#xd7;the pH of the positive electrode active material)]&#x2266;52&#x2003;&#x2003;(1).

Method of manufacturing lithium-ion secondary battery positive electrode, method of manufacturing lithium-ion secondary battery, lithium-ion secondary battery positive electrode, and lithium-ion secondary battery

An anode is provided as one capable of suppressing rapid entrance/exit of lithium ions during quick charge-discharge and ensuring sufficient safety in use as an anode of a lithium-ion secondary battery. The anode is an anode for lithium-ion secondary battery having a current collector, and an active material-containing layer formed on the current collector, wherein the active material-containing layer is comprised of an outermost layer disposed on the farthest side from the current collector, and a lower layer composed of at least one layer disposed between the outermost layer and the current collector, and wherein a degree of flexion of the outermost layer is larger than a degree of flexion of the lower layer.

Anode and lithium-ion secondary battery

An electrode is provided as one that can suppress generation of hydrogen and that has sufficiently low impedance. The electrode has an aluminum current collector, an aluminum hydroxide layer provided on the aluminum current collector, and an active material layer containing lithium-containing metal oxide and provided on the aluminum hydroxide layer. The thickness of the aluminum hydroxide layer is not more than 50 nm.

Electrode and lithium-ion secondary battery

An anode for lithium-ion secondary battery is provided as one capable of ensuring sufficient safety (suppression of dendrites) while achieving a higher capacity (higher density of the electrode), and permitting formation of a lithium-ion secondary battery with excellent high-rate discharge performance. An anode for lithium-ion secondary battery has a current collector, and an active material-containing layer formed on the current collector, the active material-containing layer is comprised of an outermost layer disposed on the farthest side from the current collector, and a lower layer composed of at least one layer disposed between the outermost layer and the current collector, and a degree of flexion of the outermost layer is smaller than that of the lower layer.

A liquid applicator comprises a guide roll for guiding a sheet, and a slit die, having a slit with an opening extending in an axial direction of the guide roll, for applying a liquid to a surface of the sheet guided by the guide roll. On the rear side of the opening in a rotating direction of the guide roll, the slit die further includes a front lip having a concave surface corresponding to the guide roll. The front lip opposes the guide roll by such a length FA in the rotating direction RD of the guide roll as to have a central angle &#x3b8; of 0.95&#xb0; to 3.0&#xb0; about an axis O of the guide roll.

Coating die having front and back concave surfaces corresponding to narrow central angles of the guide roll

The present invention provides a method of producing an electrode for an electric double layer capacitor, which yields the electrode with an electrode layer having a higher density by calendering treatment. A method of producing an electrode for a capacitor, which comprises at least a current collector and an electrode layer on the current collector, the method comprising the steps of: applying an electrode layer coating material which comprises at least a carbon material, a binder and a solvent, onto the current collector to form an electrode coating layer; drying the electrode coating layer on the current collector to set the amount of the solvent remaining in the electrode coating layer within a range of 5 to 35% by weight of the layer; and subjecting the electrode coating layer after the drying to calendering treatment to yield an electrode layer.

Method of producing electrode for capacitor

A manufacturing method for an electrode for an electrochemical capacitor according to the present invention comprises a first process (steps S-S) for forming a polarizable electrode layer on a current collector, a second process (step S) for subjecting the front surface of the polarizable electrode layer formed on the current collector, to an embossment work, and a third process (step S) for flattening the front surface of the polarizable electrode layer as has undergone the embossment work. In this manner, in the invention, the front surface of the polarizable electrode layer undergoes the embossment work, so that the polarizable electrode layer is effectively compressed, and it is consequently permitted to achieve a high volume capacitance of at least 17 F/cm. Moreover, after the embossment work, the resulting embossment is flattened, so that porous grains contained in the polarizable electrode layer are prevented from falling off, and it is permitted to ensure a high reliability.

Electrode for electric chemical capacitor, manufacturing method and apparatus thereof

An electrical double layer capacitor comprises an element and a case which houses the element. The element has an anode charge collector, anode, separator, cathode and cathode charge collector. The anode and cathode consist of a porous layer containing electrically conducting porous particles as a constituent material. The anode charge collector is disposed in electrical contact with the anode. The cathode charge collector is disposed in electrical contact with the cathode. The thickness of the element is 600 &#x3bc;m or less. The sum of the anode thickness and cathode thickness is set to 80% or less of the thickness of the element.

Electrochemical device

An electrode production method has an active-material-containing layer forming step of applying an electrode-forming coating solution containing an electrode active material, a binder capable of binding the electrode active material, and a liquid capable of dissolving or dispersing the binder, onto a collector sheet, and thereafter removing the liquid to form an active-material-containing layer on the collector, thereby obtaining a electrode sheet; and an electrode forming step of cutting the electrode sheet with a slitter apparatus to obtain an electrode.

Slitter apparatus and production method of electrode

The present invention provides a method of making an electrochemical capacitor electrode including a collector and an electronically conductive porous layer formed on the collector, the porous layer containing at least an electronically conductive porous particle and a binder adapted to bind the porous particle; the method including a mixing step of mixing the binder and a porous particle with a solvent including an organic solvent usable in a nonaqueous electrolytic solution, the organic solvent existing on a surface of the porous particle. The present invention also provides a porous particle with a solvent, wherein an organic solvent usable in a nonaqueous electrolytic solution exists on the surface of a porous body having an electronic conductivity.

Method of making electrochemical capacitor electrode, method of making electrochemical capacitor, and porous particle with solvent for use therein

A method of manufacturing an electrode includes a preparatory step of preparing an electrode matrix comprising a collector and an active material containing layer formed on at least one face of the collector, at least one edge part of the collector including an exposed surface free of the active material containing layer, an edge part of the active material containing layer on a side close to the exposed surface including a thinner part having a thickness smaller than a maximum thickness of the active material containing layer; and a roll-pressing step of pressing the electrode matrix with a roll press.

Method of manufacturing electrode and electrode

A first electrode and a second electrode to be used are electrodes each of which has a collector, and a porous material layer with electron conductivity placed between the collector and a separator, and each of which has a configuration wherein the porous material layer includes at least particles of a porous material with electron conductivity, and a thermoplastic resin being capable of binding the particles of the porous material together and having a softening point Tlower than a softening point Tof the separator. A production method includes a thermal treatment step of thermally treating a laminate at a thermal treatment temperature Tsatisfying a condition represented by Formula (1): T&#x2266;T&#x3c;T, thereby bringing the collector of the first electrode, the porous material layer of the first electrode, the separator, the porous material layer of the second electrode, and the collector of the second electrode in the laminate into an integrated state.

Method of producing electrochemical device, and the electrochemical device

An electric chemical capacitor includes first and second electrodes each including a collectora polarized electrode layerand an undercoat layerfor bonding the collector and the polarized electrode layer with each other, and a separator put between the first and second electrodes so that the polarized electrode layersandface each other, wherein an end portion of each undercoat layeris located in the same position as or on the outer side of an end portion of the corresponding polarized electrode layerand located on the inner side of an end portion of the separatorThus, the polarized electrode layers can be prevented from peeling from the collector. Further, the undercoat layers can be prevented from abutting against each other, and the undercoat layer of one electrode and the collector of the other electrode can be prevented from abutting against each other.

Growing community of inventors

Tokyo, Japan

Yousuke Miyaki