Tdk Corporation

Kazuo Katai

Kiyonori Hinoki

Yousuke Miyaki

Hideki Tanaka

Yoshihiko Ohashi

Hidetake Itoh

Yutaka Shimizu

Naomi Yoshiike

Eizo Tsunoda

Yosuke Miyaki

Katsumi Onozawa

Hiroaki Hasegawa

Eiichi Watanabe

Tadashi Suzuki

Tetsuya Takahashi

Katsuo Naoi

Keita Kobayashi

Eiji Horigome

Kazutoshi Emoto

Mitsuo Kougo

Seiichi Endo

Masayoshi Hirano

Tsuyoshi Ichiki

Akio Yamanaka

Yuukichi Morita

Masujiro Seki

An electrochemical device includes a wound laminated body with first and second electrodes, first and second separators, an electrolytic solution; and an outer package that houses the wound body and the electrolytic solution. The electrochemical device satisfies, at an outer end of the laminated body in a winding direction: the first and second separators protrude more outward in the winding direction than the second electrode; the first electrode protrudes more outward in the winding direction than the first and second separators; and an outer end of the first separator in the winding direction inclines toward a winding center and comes into contact with an upper surface of the second separator beyond the second electrode and an outer end of the first electrode in the winding direction inclines toward the winding center and comes into contact with the second separator and with the peripherally inner first electrode beyond the second electrode.

Electrochemical device and method for manufacturing electrochemical device

In an electrochemical device having an element main bodyA enclosed in an exterior packageB, a peripheral region of the exterior packageB is provided with an elastic structure or a plurality of elastic structures R, Rhaving an elastic force in a thickness direction (Z-axis direction) of films. Each of the elastic structures R, Rhas a first region of the exterior packageB folded along a film outer edge, and a second region of the exterior packageB opposed to the first region. Two ends R, R(R, R) of the first region in a direction along the film outer edge are in contact with the second region, and between the two ends R, R(R, R) there is a space (with a maximum height 2R) between the first region and the second region.

Electrochemical device

A leadof an electrochemical device includes a lead bodyA containing Al, and a bent metallic thin filmprovided to a tip part of the lead bodyA. The metallic thin filmincludes a thin film bodycontaining Ni, and a plating layercontaining Sn and covering at least an outer surface of the bent thin film body. A specific area of an inner surface of the bent thin film bodyand a surface of the lead bodyA are welded in a predetermined area without the plating layerbeing disposed there between.

Electrochemical device and manufacturing method thereof, circuit board and housing tray

An electric double layer capacitor comprising a plurality of electrode bodies comprising a positive electrode and a negative electrode laminated via a separator and being impregnated with an electrolyte solution, wherein the plurality of electrode bodies are electrically connected in series, the positive electrode and the negative electrode comprise an active material having pores, the electrolyte solution comprises an electrolyte having a cation and a counteranion of the cation, a ratio of an average pore diameter of the active material of the positive electrode to an ion diameter of the counteranion is in the range of 2.5 to 2.8, and a ratio of an average pore diameter of the active material of the negative electrode to an ion diameter of the cation is in the range of 1.65 to 1.85.

Electric double layer capacitor with non-equal areas of the active material layers of the positive electrode and the negative electrode

A wound electrochemical device has a wound body formed by winding a multilayer member including a multilayer structure composed of a positive electrode, a separator, and a negative electrode; wherein each of the positive and negative electrodes, includes a structure having an active material layer formed on both sides of a current collector; wherein the wound body has a space at a center portion thereof; and wherein the smallest radius of curvature R of a curved part in an innermost circumferential portion of the wound body satisfies the following expression (1):=&#x3b1;&#xd7;(2)&#x2003;&#x2003;(1)where R is the smallest radius of curvature of the curved part in the innermost circumferential portion of the wound body (unit: &#x3bc;m), &#x3b1; is a value within the range of 3.33 to 7.12, Tis a thickness of the current collector of the electrode positioned at the innermost circumference of the wound body (unit: &#x3bc;m), and Tis a thickness of the active material layer of the electrode positioned at the innermost circumference of the wound body (unit: &#x3bc;m), Tbeing a value within the range of 8 to 30 (unit: &#x3bc;m).

Wound electrochemical device and method of manufacturing same

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.

Electrode and electrochemical device

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 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 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

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.

Growing community of inventors

Tokyo, Japan

Kazuo Katai