公开(公告)号：US20230317951A1

公开(公告)日：2023-10-05

申请号：US18017529

申请日：2021-08-11

Applicant: DENKA COMPANY LIMITED

Inventor： Ryosuke KANTO ,  Yuhei ISHIGAKI ,  Jun WATANABE

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/66 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/505 ,  H01M4/485

CPC classification number: H01M4/622 ,  H01M4/625 ,  H01M4/0404 ,  H01M4/661 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/505 ,  H01M4/485 ,  H01M2004/028

Abstract: A composition, serving as a binder with a good balance between suppression of battery performance degradation at a high-capacity electrode, high-temperature storage property, and DC resistance, a slurry for a positive electrode using the composition, a positive electrode, and a secondary battery. The composition includes a graft copolymer, wherein: the graft copolymer has a stem polymer and a branch polymer; the stem polymer contains a polyvinyl alcohol structure, the branch polymer contains a first monomer unit containing a (meth)acrylonitrile monomer unit and/or a (meth)acrylic acid monomer; the composition has a swelling rate to an electrolytic solution of 105 to 200% at 25° C. for 15 days; the swelling rate is a swelling rate after immersing the composition in the electrolytic solution at 25° C. for 15 days; and the electrolytic solution is obtained by mixing ethylene carbonate and diethyl carbonate at a volume ratio of 1:2.

公开(公告)号：US20230348646A1

公开(公告)日：2023-11-02

申请号：US18018060

申请日：2021-08-11

Applicant: DENKA COMPANY LIMITED

Inventor： Yuhei ISHIGAKI ,  Ryosuke KANTO ,  Jun WATANABE

IPC: C08F261/04 ,  C08L51/06 ,  H01M4/62 ,  H01M4/04 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/505

CPC classification number: C08F261/04 ,  C08L51/06 ,  H01M4/622 ,  H01M4/625 ,  H01M4/0404 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/505 ,  H01M2004/028

Abstract: A composition that serves as a binder for a positive electrode with a good balance between suppression of battery performance degradation at a high-capacity electrode, high-temperature storage property, and DC resistance, a slurry for a positive electrode using the composition, a positive electrode, and a secondary battery. A free induction decay curve of the composition obtained by measuring at 180° C. by Solid Echo method using pulse NMR is separated into three components, component S180, component M180, and component H180, a component ratio of the component S180 is 10% or more and 80% or less, and a relaxation time of the component S180 is 500 μs or more.

公开(公告)号：US20250010581A1

公开(公告)日：2025-01-09

申请号：US18701376

申请日：2022-10-12

Applicant: DENKA COMPANY LIMITED

Inventor： Toru ARAI ,  Ryosuke KANTO

IPC: B32B15/082 ,  B32B15/20 ,  H01P3/08

Abstract: A multilayer structure includes at least one insulating layer(s), at least one resin layer(s), and at least one copper foil(s) each having a smooth surface and a roughened surface, wherein the insulating layer contains an olefin-aromatic vinyl compound-aromatic polyene copolymer and a surface modifier, wherein the resin layer contains one or more selected from the group consisting of polyimide, liquid crystal polymer, polyphenylene ether, polyfunctional aromatic vinyl resin, epoxy resin, and the same composition as in the insulating layer, wherein at least one surface of the respective insulating layer(s) is bonded to a smooth surface of the copper foil, and wherein, for each respective resin layer: at least one surface of the resin layer is bonded to the roughened surface, and the resin layer is not bonded to the smooth surface; or both surfaces of the resin layer are not bonded to the copper foil.

公开(公告)号：US20230275233A1

公开(公告)日：2023-08-31

申请号：US18017474

申请日：2021-08-11

Applicant: DENKA COMPANY LIMITED

Inventor： Ryosuke KANTO ,  Yuhei ISHIGAKI ,  Jun WATANABE

IPC: H01M4/62 ,  H01M10/0569 ,  H01M4/04 ,  H01M4/66 ,  H01M4/525 ,  H01M4/505 ,  H01M10/0525

CPC classification number: H01M4/622 ,  H01M10/0569 ,  H01M4/625 ,  H01M4/0404 ,  H01M4/661 ,  H01M4/525 ,  H01M4/505 ,  H01M10/0525 ,  H01M2300/0051 ,  H01M2300/0037 ,  H01M2004/028

Abstract: A composition including a graft copolymer, wherein the graft copolymer has a stem polymer and a branch polymer; the stem polymer contains a polyvinyl alcohol structure, the branch polymer contains a first monomer unit containing a (meth)acrylonitrile monomer unit and/or a (meth)acrylic acid monomer; the composition has a gel fraction of 30% or more; the gel fraction is represented by following formula: the gel fraction %=A×100/1; A g is an insoluble content left on a filter pater when 1 g of the composition is added to 300 ml of dimethyl sulfoxide to obtain a mixture and the mixture is stirred at 60° C. for 15 hours and then filtered through the filter paper, which is a No. 5C filter paper as specified in JIS P 380.