Nec Corporation

Fuji Jukogyo Kabushiki Kaisha

Makihiro Otohata

Hiroshi Yageta

Noboru Yoshida

Masatomo Mizuta

Nobuaki Yoshioka

Shinya Sudo

Kazuhiko Inoue

Kazuaki Utsumi

Kazuaki Matsumoto

Ikiko Shimanuki

Takeshi Kanai

Kiyokazu Oikawa

Toshihiko Mankyu

Hitoshi Ishikawa

Jiro Iriyama

Takeshi Azami

Provided is an electrode for a battery which effectively suppress a short circuit between a positive electrode and a negative electrode at high temperature of the battery. The electrode includes a current collector, an active material layerformed on at least one side of the current collectorand an insulating layerformed on the surface of the active material layer. The electrode was formed so that peeling occurs between the current collectorand the active material layerand the peeling strength was 10 mN/mm or more when a 90° peeling test was performed at a peeling rate of 100/min.

Electrode for battery, battery having electrode and method for manufacturing electrode and battery having electrode

One of the objects of the present invention is to provide an electrode having an active material layer and an insulating layer formed on a current collector in which the insulating layer has sufficient adhesion and which can be manufactured without significantly changing the manufacturing process. The electrode comprises a current collector, an active material layerformed on at least one surface of the current collector, and an insulating layerformed on the surface of the active material layer. The active material layerincludes an active material and a first binder. The insulating layerincludes non-conductive particles and a second binder. An interfacial binder ratio, which is a ratio of amount of a binder existing in an interface region between the active material layerand the insulating layerper unit thickness of the interface region to amount of a binder existing in the active material layerper unit thickness of the active material layer, is 85% or more.

Electrode for secondary battery, secondary battery using the electrode and method for manufacturing thereof

One of the objects of the present invention is to suppress mixing of a first layer and a second layer while forming the second layer before drying the first layer when manufacturing the electrode for the secondary battery in which the first layer and the second layer are laminated on the current collector. A method for manufacturing an electrode used as a positive electrode and a negative electrode of a secondary battery according to the present invention comprises applying a first layer slurry to a surface of a current collector, applying a second layer slurry on the first layer slurry before the first layer slurry is dried, and drying the first layer slurry and the second layer slurry after applying the first layer slurry and the second layer slurry to obtain a laminated structure in which a first layer and a second layer are laminated in this order on the current collector. A viscosity of the first layer slurry is 12000 mPa&#xb7;s or more, and/or a viscosity of the second layer slurry is 4000 mPa&#xb7;s or more when the viscosities of the first layer slurry and the second layer slurry are measured at 25&#xb0; C. with a shear rate of 1/sec.

Secondary battery electrode manufacturing method and secondary battery manufacturing method

A purpose of the present invention is to provide a lithium ion secondary battery in which an increase in internal resistance is suppressed and a halogenated cyclic anhydride is used as an electrolyte additive. The lithium ion secondary battery according to the present invention comprises a positive electrode and an electrolyte solution, wherein a porous layer comprising an insulating filler is formed on the positive electrode, and the electrolyte solution comprises 0.005 to 10 weight % of a halogenated cyclic acid anhydride.

Lithium ion secondary battery including porous insulating layer formed on positive electrode and electrolyte solution having halogenated cyclic acid anhydride

Disclosed is an electrode, comprising: a metal foil; an electrode layer formed on at least one surface of the metal foil; and an insulating layer formed on the electrode layer; wherein boundary portion between the insulating layer and the electrode layer is in a state in which a part of the insulating layer engages into a part of the electrode layer, and Ls/L is 1.25 or more, wherein a reference length of a straight line in a direction in which the metal foil extends is taken as L and a boundary length along boundary between the insulating layer and the electrode layer is taken as Ls.

Electrode and secondary battery

A method for manufacturing an electrode for a secondary battery includes: applying a first layer slurry containing a first binder to a surface of a current collector, applying a second layer slurry containing a second binder on the first layer slurry before the first layer slurry is dried, and drying the first layer slurry and the second layer slurry after applying the first layer slurry and the second layer slurry to obtain a laminated structure in which a first layer and a second layer are laminated in this order on the current collector. The second layer slurry has a solid content ratio of more than 50% by mass and a composition ratio of the second binder of more than 2% by mass.

Method for manufacturing electrode for secondary battery and method for manufacturing secondary battery

A purpose of the present invention is to provide an electrode assembly and a manufacturing method therefor that can favorably suppress a short circuit that is due to a burr created by punching. At least one of the cathodeand the anodeof the electrode assembly of the present invention is covered with an insulating layer. The cathodeand the anodeare oriented such that the burrof the cathodeand the burrof the anodeof the opposing cathodeand the opposing anodeclose to at least the outer peripheral edge of the cathodeand the outer peripheral edge of the anodedo not face each otherare opposed to each other.

Electrode assembly and manufacturing method therefor

A method of manufacturing an electrode, comprising the steps of: forming a first layer by intermittently applying a layer to a current collecting foil with thickness of 40 &#x3bc;m or more and 300 &#x3bc;m or less; and forming a second layer, wherein the second layer is formed both on a region where the first layer has been formed on the current collecting foil and an exposed region where the current collecting foil is exposed without being formed the first layer; wherein in the step of forming of second layer, providing a gap of 40 &#x3bc;m or more between a applying part of application apparatus and the current collecting foil, based on a positional information of the first layer, from during applying a layer to the exposed region to during applying a layer to the first layer.

Method of manufacturing battery electrode and electrode manufacturing apparatus

A secondary battery electrode manufacturing method comprises applying a slurry for a first layer to a current collector, applying a slurry for a second layer to the slurry for the first layer before the slurry for the first layer dries, and drying the slurries to obtain a laminated structure in which the first and second layers are laminated in this order on the current collector. A first and second binder or thickener for the respective slurries are selected such that when viscosities are measured for a first solution including solvent and the first binder or thickener dissolved in the solvent in a specific mass ratio and a second solution including a solvent and the second binder or thickener dissolved in the solvent at the same mass ratio under the same conditions, the viscosity of the first solution is higher than the viscosity of the second solution.

The secondary battery comprises: a battery elementhaving a positive electrodewherein positive active materialare applied on both surfaces of a positive current collector, a negative electrodewherein negative active materialare applied on both surfaces of a negative current collector, and a separator; a packaging film, made of a film that includes a heat-seal resin layer, for accommodating the battery element; wherein a melting point or a decomposition temperature of the separator is higher than a melting point of the heat-seal resin layer by 50&#xb0; C. or more; and wherein, at least a part of the active material layerof the positive electrode or the negative electrode and the heat-seal resin layer are heat-sealed to each other at at least one surface of the upper surface and the lower surface of the battery element.

Secondary battery, method for manufacturing secondary battery, electric vehicle and electricity storage system

A film package batteryhas a battery element () having a positive electrode, a negative electrode and a separator that are stacked or wound, wherein, at least at 200&#xb0; C., the separator does not melt or soften and has a heat shrinkage ratio of 3% or less; a film package () enclosing the battery element; and a fixing tape () fixed to a part of the battery element and fixed to an inner surface of the film package.

Film packaged battery

The present invention provides a lithium ion secondary battery comprising: a positive electrode; a negative electrode comprising a negative electrode active material comprising at least one carbon material selected from the group consisting of a natural graphite, an artificial graphite, a non-graphitizable carbon and a graphitizable carbon; and an electrolyte solution comprising a specific cyclic disulfonate ester compound and an acid anhydride.

Lithium ion secondary battery

It is an object of the present invention to provide a method for producing a secondary battery in which water in the outer package can be removed even when the secondary battery includes an electrolytic solution containing a halogen-containing compound. The present exemplary embodiment is a method for producing a secondary battery including an electrolytic solution containing a supporting salt, a nonaqueous solvent, and a halogen-containing compound, an electrode assembly including a negative electrode and a positive electrode, and an outer package, the method including (1) disposing a first solution containing at least the supporting salt and the nonaqueous solvent, and the electrode assembly in the outer package; (2) charging the electrode assembly; (3) emitting from the outer package a gas generated by the charge; and (4) injecting a second solution including at least the halogen-containing compound into the outer package after the gas is emitted, wherein the first solution does not contain the halogen-containing compound, and the electrolytic solution includes the first solution and the second solution.

Method for producing secondary battery

A packaged battery, an assembled battery, and a film-covered battery, which can prevent a dangerous state involving a high-pressure gas filled in the film-covered battery while ensuring a sealing reliability, are provided. The Packaged battery includes film-covered batteryincluding a battery element and exterior films forming a sealed space housing the battery element, and holding memberholding film-covered battery. The sealed space includes a housing section housing the battery element, and a pocket communicating with the housing section to expand when the pressure in the sealed space increases. The pocket includes a safety valve which activates when the pocket expands. Holding memberincludes an opening and a cavity fitting the housing section therein. When the housing section is fitted into the cavity, at least part of the pocket and the safety valve protrude to the outside of the holding member from the opening.

Growing community of inventors

Tokyo, Japan

Makihiro Otohata