公开(公告)号：US20200220119A1

公开(公告)日：2020-07-09

申请号：US16645005

申请日：2018-09-27

Applicant: NEC CORPORATION

Inventor： Noboru YOSHIDA ,  Kazuhiko INOUE ,  Kenichi SHIMURA ,  Makihiro OTOHATA

IPC: H01M2/02 ,  H01M2/08 ,  H01M10/04

Abstract: A battery having a battery element with an outer package made of a film that includes a first portion having a first bottom wall and a first side wall rising from an outer peripheral end of the first bottom wall over an entire outer peripheral end of the first bottom wall, a second portion having a second bottom wall and a second sidewall rising from an outer peripheral end at least at a part of the outer peripheral end of the second bottom surface, and a joining portion in which outer peripheral portions of the first and second portions are joined when the battery element is between the first and second bottom walls and the first and second portions face each other, wherein the joining portion includes a sidewall joining portion in which the first and second sidewalls are joined and located outside a thickness range of the battery element.

公开(公告)号：US20160226099A1

公开(公告)日：2016-08-04

申请号：US15021669

申请日：2014-08-28

Applicant: NEC CORPORATION

Inventor： Takeshi AZAMI ,  Hitoshi ISHIKAWA ,  Noboru YOSHIDA ,  Ikiko SHIMANUKI ,  Kazuaki MATSUMOTO ,  Makihiro OTOHATA

IPC: H01M10/0567 ,  H01M4/131 ,  H01M4/505 ,  H01M10/0568 ,  H01M4/66 ,  H01M4/133 ,  H01M2/16 ,  H01M10/0569 ,  H01M10/0525 ,  H01M4/62

CPC classification number: H01M10/0567 ,  H01M2/1653 ,  H01M4/131 ,  H01M4/133 ,  H01M4/364 ,  H01M4/505 ,  H01M4/587 ,  H01M4/622 ,  H01M4/623 ,  H01M4/625 ,  H01M4/661 ,  H01M10/0525 ,  H01M10/0568 ,  H01M10/0569 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2300/0037 ,  Y02T10/7011

Abstract: 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.

Abstract translation: 本发明提供一种锂离子二次电池，其包括：正极; 包含负极活性物质的负极，所述负极活性物质包含选自天然石墨，人造石墨，不可石墨化碳和可石墨化碳的至少一种碳材料; 以及包含特定的环状二磺酸酯化合物和酸酐的电解质溶液。

公开(公告)号：US20200381698A1

公开(公告)日：2020-12-03

申请号：US16766358

申请日：2018-11-13

Applicant: NEC CORPORATION

Inventor： Noboru YOSHIDA ,  Makihiro OTOHATA

IPC: H01M4/04 ,  H01M4/1391 ,  H01M10/058 ,  H01M4/62 ,  H01M4/131 ,  H01M4/505 ,  H01M4/525

Abstract: 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.

公开(公告)号：US20200058930A1

公开(公告)日：2020-02-20

申请号：US16500508

申请日：2018-02-08

Applicant: NEC Corporation

Inventor： Makihiro OTOHATA ,  Noboru YOSHIDA

IPC: H01M4/139 ,  H01M4/04

Abstract: 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·s or more, and/or a viscosity of the second layer slurry is 4000 mPa·s or more when the viscosities of the first layer slurry and the second layer slurry are measured at 25° C. with a shear rate of 1/sec.

公开(公告)号：US20210036330A1

公开(公告)日：2021-02-04

申请号：US16980235

申请日：2019-02-07

Applicant: NEC CORPORATION

Inventor： Noboru YOSHIDA ,  Makihiro OTOHATA

IPC: H01M4/66 ,  H01M4/62 ,  H01M4/36 ,  H01M4/04 ,  H01M10/0525

Abstract: 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 110, an active material layer 111 formed on at least one surface of the current collector 110, and an insulating layer 112 formed on the surface of the active material layer 111. The active material layer 111 includes an active material and a first binder. The insulating layer 112 includes 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 layer 111 and the insulating layer 112 per unit thickness of the interface region to amount of a binder existing in the active material layer 111 per unit thickness of the active material layer 111, is 85% or more.

公开(公告)号：US20190157651A1

公开(公告)日：2019-05-23

申请号：US16320672

申请日：2017-07-20

Applicant: NEC CORPORATION

Inventor： Makihiro OTOHATA

IPC: H01M2/26 ,  H01M4/36 ,  H01M4/04 ,  H01M10/0585

Abstract: 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 cathode 11 and the anode 12 of the electrode assembly of the present invention is covered with an insulating layer. The cathode 11 and the anode 12 are oriented such that the burr 11b of the cathode 11 and the burr 12b of the anode 12 of the opposing cathode 11 and the opposing anode 12 close to at least the outer peripheral edge of the cathode 11 and the outer peripheral edge of the anode 12 do not face each other 12 are opposed to each other.

公开(公告)号：US20180102568A1

公开(公告)日：2018-04-12

申请号：US15560185

申请日：2016-03-23

Applicant: NEC CORPORATION

Inventor： Makihiro OTOHATA

IPC: H01M10/0525 ,  H01M10/0585 ,  H01M10/04 ,  H01M2/02 ,  H01M2/26

CPC classification number: H01M10/0525 ,  H01G11/06 ,  H01G11/12 ,  H01G11/52 ,  H01G11/78 ,  H01G11/80 ,  H01M2/02 ,  H01M2/0275 ,  H01M2/0287 ,  H01M2/16 ,  H01M2/263 ,  H01M10/04 ,  H01M10/052 ,  H01M10/0585 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

Abstract: The secondary battery comprises: a battery element 20 having a positive electrode 30 wherein positive active material 31 are applied on both surfaces of a positive current collector 32, a negative electrode 40 wherein negative active material 41 are applied on both surfaces of a negative current collector 42, and a separator; a packaging film 10, made of a film that includes a heat-seal resin layer 13, 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° C. or more; and wherein, at least a part of the active material layer 31, 41 of 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.

公开(公告)号：US20200303743A1

公开(公告)日：2020-09-24

申请号：US16086188

申请日：2017-05-18

Applicant: NEC CORPORATION

Inventor： Noboru YOSHIDA ,  Makihiro OTOHATA ,  Shinya SUDO

IPC: H01M4/66 ,  H01M4/62 ,  H01M4/04 ,  H01M4/36 ,  H01M10/0569 ,  H01M10/0525 ,  H01M2/16

Abstract: 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 110, an active material layer 111 formed on at least one side of the current collector 110 and an insulating layer 112 formed on the surface of the active material layer 111. The electrode was formed so that peeling occurs between the current collector 110 and the active material layer 111 and the peeling strength was 10 mN/mm or more when a 90° peeling test was performed at a peeling rate of 100/min.

公开(公告)号：US20200153044A1

公开(公告)日：2020-05-14

申请号：US16608008

申请日：2018-04-24

Applicant: NEC Corporation

Inventor： Makihiro OTOHATA ,  Noboru YOSHIDA

IPC: H01M10/0567 ,  H01M10/0525 ,  H01M10/058 ,  C07D305/10

Abstract: 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.

公开(公告)号：US20190103598A1

公开(公告)日：2019-04-04

申请号：US16087379

申请日：2017-03-21

Applicant: NEC Corporation

Inventor： Makihiro OTOHATA

IPC: H01M4/04 ,  H01M4/66 ,  H01M4/70

Abstract: 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 μm or more and 300 μm 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 μm 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.