公开(公告)号：US20210210785A1

公开(公告)日：2021-07-08

申请号：US16760242

申请日：2018-10-31

Applicant: NEC CORPORATION

Inventor： Shin SERIZAWA ,  Suguru TAMAI ,  Kazuhiko INOUE

IPC: H01M10/0567 ,  H01M10/0525 ,  H01M4/62 ,  H01M4/38 ,  H01M4/583 ,  H01M4/36 ,  H01M4/525 ,  H01M4/04 ,  H01M4/66 ,  H01M10/0568

Abstract: Deterioration in cycle characteristics and battery swelling are improved. The lithium ion secondary battery of the present invention is characterized in comprising an electrolyte solution comprising a multifunctional monomer comprising two or more epoxy groups and a negative electrode comprising a binder comprising a polymer comprising a monomer unit comprising a functional group selected from the group consisting of —OH, —OM, —COOH, —COOM and —COOCnH2n+1, wherein M is a metal element, and n is an integer of 1 to 5.

公开(公告)号：US20210057721A1

公开(公告)日：2021-02-25

申请号：US16767286

申请日：2018-11-21

Applicant: NEC CORPORATION

Inventor： Daisuke KAWASAKI ,  Takashi OHTSUKA ,  Kazuhiko INOUE

IPC: H01M4/134 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/38 ,  H01M4/66 ,  H01M4/62 ,  H01M10/0569 ,  H01M10/0567

Abstract: Provided is a lithium ion secondary battery having high energy density and excellent cycle characteristics, and hardly causing burning. The present invention relates to a lithium ion secondary battery comprising an electrode mixture layer comprising an electrode active material comprising Si alloy having a median diameter of 1.2 μm or less and 12% by weight or more and 50% by weight or less of an electrode binder; and an electrolyte solution comprising 60% by volume or more and 99% by volume or less of a phosphoric acid ester compound, 0% by volume or more and 30% by volume or less of a fluorinated ether compound, and 1% by volume or more and 35% by volume or less of a fluorinated carbonate compound, wherein the total amount of the phosphoric acid ester compound and the fluorinated ether compound is 65% by volume or more.

公开(公告)号：US20170317387A1

公开(公告)日：2017-11-02

申请号：US15521263

申请日：2015-10-19

Applicant: NEC Corporation

Inventor： Kazuhiko INOUE ,  Kenichi SHIMURA ,  Noboru YOSHIDA

IPC: H01M10/0569 ,  H01M10/0567 ,  H01M2/16 ,  H01M10/0585 ,  H01M10/0565

Abstract: Provided is a secondary battery which uses a heat generating reaction of the redox shuttle agent to achieve stopping a function of fee battery by blocking ion conduction and rapidly increasing an internal resistance by means of volatilized non-aqueous solvent when an abnormality such as overcharge occurs. A secondary battery 1 comprises a battery element comprising a positive electrode 11, a negative electrode 12, a separator 13, and an electrolytic solution, and a casing sealing the battery element. The electrolytic solution comprises a redox shuttle agent and an organic solvent having a boiling point of 125° C. or less. The separator 13 comprises aramid fiber assembly, aramid microporous structure, polyimide microporous structure or polyphenylenesulfide microporous structure, and polyphenylenesulfide, and has an average void size of 0.1 μm or more.

公开(公告)号：US20210028485A1

公开(公告)日：2021-01-28

申请号：US16980479

申请日：2019-03-20

Applicant: NEC CORPORATION

Inventor： Kazuhiko INOUE ,  Kenichi SHIMURA

IPC: H01M10/0525 ,  H01M10/0569 ,  H01M4/36 ,  H01M4/62 ,  H01M2/16 ,  H01M10/0567

Abstract: An object of one embodiment of the present invention is to provide a lithium-ion secondary battery with high safety in which deterioration of a separator comprising polyethylene terephthalate is suppressed even when an electrolyte solution comprising a carbonate-based solvent is used. A first lithium ion secondary battery of the present invention is a lithium ion secondary battery comprising an electrode laminate comprising a positive electrode, a negative electrode and a separator, and an electrolyte solution, wherein the negative electrode comprises a solution type binder, the separator comprises polyethylene terephthalate, and the electrolyte solution comprises a solvent comprising a compound having a carbonate group.

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：US20200028199A1

公开(公告)日：2020-01-23

申请号：US16489002

申请日：2018-02-08

Applicant: NEC Corporation

Inventor： Noboru YOSHIDA ,  Kazuhiko INOUE

IPC: H01M10/04 ,  H01M10/0585 ,  H01M10/0565 ,  H01M10/0567 ,  H01M2/08 ,  H01M4/02

Abstract: One of the objects of the present invention is to suppress a short circuit due to metal deposition in an insulating layer in a secondary battery in which a positive electrode and a negative electrode are disposed to face each other via the insulating layer. The secondary battery comprises a battery element including at least one positive electrode 11 and at least one negative electrode 12, and a casing that seals the battery element together with an electrolyte. At least one of the positive electrode 11 and the negative electrode 12 comprises a current collector, an active material layer formed on at least one surface of the current collector, and an insulating layer 112 formed on the surface of the active material layer. The electrolyte comprises an electrolyte component and a crosslinked gelling agent. The gelling agent exists at least between the active material layer of the positive electrode 11 and the active material layer of the negative electrode 12, and the ratio Rg of the gelling agent to 100% by mass of the electrolyte component in between the active material layer of the positive electrode 11 and the active material layer of the negative electrode 12 is 0

公开(公告)号：US20180159105A1

公开(公告)日：2018-06-07

申请号：US15572569

申请日：2016-05-09

Applicant: NEC CORPORATION

Inventor： Jiro IRIYAMA ,  Kazuhiko INOUE ,  Kenichi SHIMURA

IPC: H01M2/16 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/505 ,  H01M10/0585

CPC classification number: H01M2/1653 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/058 ,  H01M10/0585 ,  H01M2220/20 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

Abstract: There is provided a lithium ion secondary battery having a positive electrode comprising a lithium nickel composite oxide as a positive electrode active material, and a separator consisting of one or more layers selected from a polyimide layer, a polyamide layer, and a polyamide imide layer, the lithium secondary battery exhibiting a low self-discharge failure rate even after long term storage. The present invention pertains to a lithium ion secondary battery having a positive electrode comprising a positive electrode active material comprising a lithium nickel composite oxide and a separator consisting of one or more layers selected from a polyimide layer, a polyamide layer, and a polyamide imide layer, wherein a suspension prepared by mixing the positive electrode active material and a deionized water at a mass ratio of 2:98 shows a pH of 9.3 or less.

公开(公告)号：US20180090792A1

公开(公告)日：2018-03-29

申请号：US15560639

申请日：2016-03-22

Applicant: NEC CORPORATION

Inventor： Daisuke KAWASAKI ,  Kenichi SHIMURA ,  Noboru YOSHIDA ,  Kazuhiko INOUE ,  Jiro IRIYAMA

IPC: H01M10/0585 ,  H01M10/0525 ,  H01M10/0569 ,  H01M4/131 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M4/04 ,  H01M10/04

CPC classification number: H01M10/0585 ,  H01M2/16 ,  H01M4/0404 ,  H01M4/131 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0413 ,  H01M10/0525 ,  H01M10/0569 ,  H01M2004/021 ,  H01M2220/20 ,  H01M2300/0028 ,  Y02P70/54 ,  Y02T10/7011

Abstract: The present invention relates to a lithium ion secondary battery comprising a positive electrode having a coating amount per unit area of 50 mg/cm2 or more and an electrode density of 3.3 g/cc or more and a negative electrode having a coating amount per unit area of 24 mg/cm2 or more and an electrode density of 1.5 g/cc or more, a separator having a shrinking ratio of 2% or less by heat treatment at 80° C. for 6 hours, and an electrolyte solution comprising at least one sulfonic acid ester compound, and a ratio of a sulfur content in the central portion (As) and a sulfur content in the edge portion (Bs) of the positive electrode and the negative electrode, in each, is 0.7≦As/Bs≦1.1.

公开(公告)号：US20170358829A1

公开(公告)日：2017-12-14

申请号：US15521242

申请日：2015-10-19

Applicant: NEC Corporation

Inventor： Kazuhiko INOUE ,  Kenichi SHIMURA

IPC: H01M10/42 ,  H01M2/16 ,  H01M10/0565 ,  H01M10/0568 ,  H01M2/34 ,  H01M10/0569

CPC classification number: H01M10/4235 ,  H01M2/145 ,  H01M2/162 ,  H01M2/1653 ,  H01M2/345 ,  H01M10/052 ,  H01M10/0565 ,  H01M10/0568 ,  H01M10/0569 ,  H01M10/0585 ,  H01M2200/20 ,  H01M2300/0085 ,  Y02P70/54 ,  Y02T10/7011

Abstract: Provided is a secondary battery capable of breaking an external electrical connection by way of a simpler configuration when an abnormality such as overcharge occurs. A secondary battery 1 comprises a battery element comprising a positive electrode 11, a negative electrode 12, a separator 13, and an electrolytic solution, and a casing sealing the battery element. The electrolytic solution comprises a gel component and an organic solvent having a boiling point of 125° C. or less. The separator 13 comprises a fiber assembly or a microporous structure composed of one or more resins selected from aramid, polyimide, and polyphenylenesulfide, and has an average void size of 0.1 μm or more.

公开(公告)号：US20190393465A1

公开(公告)日：2019-12-26

申请号：US16480955

申请日：2018-01-25

Applicant: NEC CORPORATION

Inventor： Noboru YOSHIDA ,  Kazuhiko INOUE ,  Kenichi SHIMURA

IPC: H01M2/16 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/62 ,  B60L50/64

Abstract: A purpose of one embodiment of the present invention is to provide a highly safe lithium ion secondary battery comprising a layered lithium nickel composite oxide with high nickel content and a polyethylene terephthalate separator. The first lithium ion secondary battery of the present invention is characterized by comprising a positive electrode comprising a positive electrode mixture layer and an insulation layer, and a separator comprising polyethylene terephthalate, wherein the positive electrode mixture layer comprises a layered lithium nickel composite oxide having a nickel ratio of 60 mol % or more based on metals other than lithium.