公开(公告)号：US20180358624A1

公开(公告)日：2018-12-13

申请号：US15774541

申请日：2016-08-26

Applicant: Denka Company Limited

Inventor： Takuya NARUTOMI ,  Jun WATANABE ,  Shigeru SUZUKI

IPC: H01M4/62 ,  C08F261/04 ,  C08K3/04 ,  H01M4/525 ,  H01M4/505 ,  H01M4/131 ,  H01M4/66 ,  H01M10/0525

CPC classification number: H01M4/622 ,  C08F261/04 ,  C08K3/04 ,  C08K2201/001 ,  C08L51/06 ,  H01M4/0404 ,  H01M4/131 ,  H01M4/505 ,  H01M4/525 ,  H01M4/625 ,  H01M4/661 ,  H01M10/0525 ,  H01M2004/028 ,  Y02E60/122 ,  Y02T10/7011 ,  C08F220/44 ,  C08L33/20

Abstract: A binder composition for positive electrode with superior oxidation resistance is provided. A slurry for positive electrode, a positive electrode, and a lithium ion secondary battery manufactured by using the binder composition is provided. A binder composition for positive electrode including a graft copolymer in which a monomer containing acrylonitrile as a main component is graft copolymerized with polyvinyl alcohol having an average degree of polymerization of 300 to 3000 and a saponification degree of 70 to 100 mol %, is provided. Further, a slurry for positive electrode includes the binder composition for positive electrode, a positive electrode active material, and a conductive assistant. In addition, a lithium ion secondary battery is manufactured using a positive electrode made with the slurry for positive electrode and a positive electrode.

公开(公告)号：US20200207898A1

公开(公告)日：2020-07-02

申请号：US16622513

申请日：2018-06-13

Applicant: DENKA COMPANY LIMITED

Inventor： Soichiro NAKANISHI ,  Takuya NARUTOMI ,  Kyoichi INOUE ,  Shigeru SUZUKI ,  Jun WATANABE

IPC: C08F261/04 ,  C08K3/04 ,  C08L51/00 ,  H01M10/0525 ,  H01M4/62 ,  H01M4/525 ,  H01M4/131 ,  H01M4/505

Abstract: An object of the present invention is to provide a composition having flexibility. A composition comprising a graft copolymer in which a monomer, including a (meth) acrylonitrile and a (meth) acrylic acid ester as a main monomer, graft-copolymerizes to a backbone polymer having a polyvinyl alcohol, wherein the polyvinyl alcohol has a saponification degree of 50 to 100 mol %, a content of the composition of the polyvinyl alcohol is 5 to 50% by mass, a total content of the (meth) acrylonitrile monomer unit and the (meth) acrylic acid ester monomer unit is 50 to 95% by mass, a content of the (meth) acrylonitrile monomer unit in a total of 100% by mass of the (meth) acrylonitrile monomer unit and the (meth)acrylate monomer unit is 20 to 95% by mass, a content of the (meth)acrylate monomer unit in a total of 100% by mass of the (meth) acrylonitrile monomer unit and the (meth)acrylate monomer unit is 5 to 80% by mass, the (meth) acrylic acid ester is a monomer whose homopolymer has a glass transition temperature of 150 to 300 K.

公开(公告)号：US20190027756A1

公开(公告)日：2019-01-24

申请号：US16080938

申请日：2017-03-08

Applicant: DENKA COMPANY LIMITED

Inventor： Takuya NARUTOMI ,  Jun WATANABE ,  Shigeru SUZUKI

IPC: H01M4/62 ,  H01M10/0525 ,  H01M4/134 ,  H01M4/133 ,  C08L51/00

Abstract: Provided is a binder composition for negative electrode that has good binding property with an active material and a metal foil and is superior in reduction resistance. A binder composition for negative electrode comprising a graft copolymer obtained by graft copolymerizing, with polyvinyl alcohol, a monomer containing (meth)acrylonitrile as a main component, wherein the polyvinyl alcohol has an average degree of polymerization of 300 to 3000; the polyvinyl alcohol has a saponification degree of 70 to 100 mol %; the graft copolymer has a polyvinyl alcohol amount of 10 to 90 mass %; and the graft copolymer has a poly(meth)acrylonitrile amount of 90 to 10 mass %.

公开(公告)号：US20210151763A1

公开(公告)日：2021-05-20

申请号：US16621567

申请日：2018-06-13

Applicant: DENKA COMPANY LIMITED

Inventor： Takuya NARUTOMI ,  Jun WATANABE ,  Shigeru SUZUKI

IPC: H01M4/62 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/525 ,  C08L51/00 ,  C08L27/16

Abstract: An object of the present invention is to provide a composition for a positive electrode having high binding properties and high flexibility. A composition for a positive electrode, comprising: a graft copolymer-based resin; a polyvinylidene fluoride-based resin, wherein the graft copolymer-based resin includes a graft copolymer in which a monomer, having (meth)acrylonitrile as a main component, is graft-copolymerized with a polyvinyl alcohol. The graft copolymer-based resin optionally further includes at least one of a (meth)acrylonitrile-based non-graft polymer and a polyvinyl alcohol homopolymer. And, a slurry for a positive electrode comprising the composition. A positive electrode comprising a metal foil and a coating film of the slurry. The composition preferably has a mass ratio of the graft copolymer-based resin and the polyvinylidene fluoride resin, which is: graft copolymer-based resin/polyvinylidene fluoride-based resin=2/8 to 8/2.

公开(公告)号：US20190248944A1

公开(公告)日：2019-08-15

申请号：US16320646

申请日：2017-07-14

Applicant: Denka Company Limited

Inventor： Tatsuya NAGAI ,  Takuya NARUTOMI ,  Tetsuya ITO ,  Hiroshi YOKOTA

IPC: C08F261/04 ,  H01M4/62 ,  H01M4/505 ,  H01M4/1391 ,  H01M4/525 ,  H01M10/0525 ,  C08L27/16 ,  C08K3/04 ,  C08F20/44

CPC classification number: C08F261/04 ,  C08F20/44 ,  C08K3/04 ,  C08K2201/001 ,  C08L27/16 ,  C08L2203/20 ,  H01M4/1391 ,  H01M4/505 ,  H01M4/525 ,  H01M4/5825 ,  H01M4/62 ,  H01M4/623 ,  H01M4/625 ,  H01M10/0525

Abstract: [Problem]To provide a conductive resin composition for electrodes which is excellent in dispersibility and oxidation resistance. To provide: an electrode composition employing the conductive resin composition for electrodes and having a low viscosity; an electrode employing the electrode composition and having a low electrode plate resistance; and a lithium ion battery having a high energy density, high output characteristics and a high cyclability.[Solution]A conductive resin composition for electrodes, comprising a dispersant, a conductive agent, and a binding material, wherein: the dispersant comprises a graft copolymer in which a monomer containing acrylonitrile as a main component is grafted onto polyvinyl alcohol; the average degree of polymerization of the polyvinyl alcohol is 300 to 3,000 and the degree of saponification of the same is 90 mol % to 100 mol %; and the polyvinyl alcohol content and the polyacrylonitrile content in the graft copolymer are, respectively, 10 mass % to 40 mass % and 90 mass % to 60 mass %.