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 %.

公开(公告)号：US20190198879A1

公开(公告)日：2019-06-27

申请号：US16330657

申请日：2017-07-03

Applicant: DENKA COMPANY LIMITED

Inventor： Tatsuya NAGAI ,  Yoko HORIKOSHI ,  Hitoshi KANEKO ,  Hiroshi YOKOTA

IPC: H01M4/62 ,  H01M4/66

CPC classification number: H01M4/625 ,  B82B1/00 ,  C01B32/158 ,  H01M4/13 ,  H01M4/131 ,  H01M4/136 ,  H01M4/505 ,  H01M4/525 ,  H01M4/58 ,  H01M4/62 ,  H01M4/66 ,  H01M4/661 ,  H01M2004/028

Abstract: Provided is a conductive composition for electrodes, the conductive composition having excellent electrical conductivity and dispersibility. Also provided are: a positive electrode for non-aqueous batteries, the positive electrode using the conductive composition and having low electrode plate resistance and excellent binding properties; and a non-aqueous battery having high energy density, high output characteristics, and high cycle characteristics. The conductive composition for electrodes contains a conductive material, an active material, a binder, and a dispersant, wherein the conductive material contains carbon black and a multi-walled carbon nanotube having a powder resistivity of 0.035 Ω⋅cm or less as measured under a load of 9.8 MPa, and a median volumetric diameter D50 value, which is as a measure of dispersibility, in the range of 0.3-8 μm The positive electrode which is for non-aqueous batteries and has low electrode plate resistance and excellent binding properties; and the non-aqueous battery having high output characteristics and high cycle characteristics are obtained by using the conductive composition in which the content of the multi-walled carbon nanotube in the conductive material is 3-50 mass %.

公开(公告)号：US20250140864A1

公开(公告)日：2025-05-01

申请号：US18693654

申请日：2022-09-27

Applicant: DENKA COMPANY LIMITED

Inventor： Michiya NAKASHIMA ,  Tatsuya NAGAI ,  Yusaku HARADA ,  Masato YAMADA ,  Kosuke TANAKA

IPC: H01M4/62 ,  H01M4/02

Abstract: A carbon black having a bulk density of 0.08 g/cm3 or lower after being compressed at 490 Pa for 3 minutes. A carbon black having a bulk density of 0.1 g/cm3 or lower after being stirred under a condition of gravity acceleration 400 G for 30 minutes using a rotation-revolution type stirrer.

公开(公告)号：US20200313159A1

公开(公告)日：2020-10-01

申请号：US16754736

申请日：2018-09-28

Applicant: Denka Company Limited ,  Jiangxi University of Science and Technology

Inventor： Shinichiro OSUMI ,  Tatsuya NAGAI ,  Tetsuya ITO ,  Sheng Wen ZHONG ,  Jun CHEN ,  Qian ZHANG ,  Min ZENG

IPC: H01M4/131 ,  H01M4/485 ,  H01M4/62 ,  H01M10/0525

Abstract: According to various aspects of the present invention, a positive electrode composition for a lithium-ion secondary battery includes an active material capable of inserting and extracting lithium ions, and a conductor, wherein the active material is a lithium-nickel-cobalt-manganese complex oxide; the conductor is a carbon black and carbon nanotubes; the carbon black has a BET specific surface area of 100 to 400 m2/g, and a DBP absorption of 210 to 380 ml/100 g; and the carbon nanotubes have an average diameter of 7 to 15 nm.

公开(公告)号：US20250132346A1

公开(公告)日：2025-04-24

申请号：US18685605

申请日：2022-08-16

Applicant: Denka Company Limited

Inventor： Tatsuya NAGAI ,  Yuma KITAE ,  Tetsuya ITO

IPC: H01M4/62 ,  H01M4/02 ,  H01M4/04

Abstract: A method for producing a positive electrode composition, the method including: a first step of mixing a first agent containing a binding material and a first liquid medium, a second agent containing carbon black and a second liquid medium, and a third agent containing carbon nanotubes and a third liquid medium to obtain a mixed solution; and a second step of mixing the mixed solution and an active material to obtain a positive electrode composition.

公开(公告)号：US20240290971A1

公开(公告)日：2024-08-29

申请号：US18572178

申请日：2022-06-14

Applicant: Denka Company Limited

Inventor： Tatsuya NAGAI ,  Yuma KITAE ,  Tetsuya ITO

IPC: H01M4/583 ,  H01M4/02

CPC classification number: H01M4/583 ,  H01M2004/021 ,  H01M2004/028

Abstract: A positive electrode composition containing carbon black, carbon nanotubes, an active material, and a binding material, in which the carbon black has a BET specific surface area of 100 to 400 m2/g and a crystallite size (Lc) of 15 to 26 Å, the carbon nanotubes have an average diameter of 5 to 15 nm, and a ratio (average diameter/BET specific surface area) of the average diameter with respect to a BET specific surface area of the carbon nanotubes is 0.01 to 0.068 nm/(m2/g).

公开(公告)号：US20240076502A1

公开(公告)日：2024-03-07

申请号：US18262507

申请日：2022-01-21

Applicant: Denka Company Limited

Inventor： Tetsuya ITO ,  Yusaku HARADA ,  Kosuke TANAKA ,  Tatsuya NAGAI

IPC: C09C1/54 ,  C09C1/56

CPC classification number: C09C1/54 ,  C09C1/56 ,  C01P2006/12 ,  C01P2006/42

Abstract: Carbon black in which an oil absorption amount is 150 mL/100 g or more and 400 mL/100 g or less and a nickel content that is measured by induced coupled plasma-mass spectrometry is 50 ppb or less.

公开(公告)号：US20200227721A1

公开(公告)日：2020-07-16

申请号：US16822284

申请日：2020-03-18

Applicant: Denka Company Limited ,  CENTRAL GLASS COMPANY, LIMITED

Inventor： Shinichiro OSUMI ,  Tatsuya NAGAI ,  Takako ARAI ,  Tetsuya ITO ,  Hiroyuki OOMORI ,  Shoi SUZUKI ,  Akifumi YAO

IPC: H01M4/04 ,  H01M4/62 ,  H01M4/1393

Abstract: To provide a carbon black for batteries capable of readily obtaining a positive electrode for batteries having excellent adhesiveness, and excellent output characteristics and the cycle characteristics. A carbon black for batteries, the carbon black having a BET specific surface area measured according to JIS K6217-2 C method of 100 m2/g or larger, and a surface fluorine concentration X (unit: atom %) and a surface oxygen concentration Y (unit: atom %) measured by X-ray Photoelectron Spectroscopy (XPS) satisfying the following conditions (A) and (B), 0.3≤X≤4.0 and  (A) 0.1≤Y≤3.0.  (B)

公开(公告)号：US20240079598A1

公开(公告)日：2024-03-07

申请号：US18262499

申请日：2022-01-21

Applicant: Denka Company Limited

Inventor： Tetsuya ITO ,  Yusaku HARADA ,  Kosuke TANAKA ,  Tatsuya NAGAI

IPC: H01M4/62 ,  C09C1/54 ,  C09C1/56

CPC classification number: H01M4/625 ,  C09C1/54 ,  C09C1/56 ,  C01P2006/12 ,  C01P2006/19 ,  C01P2006/40 ,  C01P2006/80

Abstract: Carbon black in which an oil absorption amount is 150 mL/100 g or more and 400 mL/100 g or less and an iron content that is measured by induced coupled plasma-mass spectrometry is 500 ppb or less.

公开(公告)号：US20210119206A1

公开(公告)日：2021-04-22

申请号：US17047384

申请日：2019-04-26

Applicant: Denka Company Limited

Inventor： Tatsuya NAGAI ,  Shinichiro OSUMI ,  Tetsuya ITO

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/133 ,  H01M4/131

Abstract: A positive electrode composition for a lithium ion secondary battery includes an active material that can occlude and release lithium ions and a conductive material, wherein the active material is a lithium cobalt composite oxide; the conductive material is carbon black and carbon nanotubes; the carbon black has a BET specific surface area of 100 to 400 m2/g and a DBP absorption amount of 210 to 400 ml/100 g; the carbon nanotubes have an average diameter of 20 nm or less, a BET specific surface area of 170 m2/g or more, and an aspect ratio of 50 or more; and a carbon black content X (unit: % by mass) and a carbon nanotube content Y (unit: % by mass) in the positive electrode composition satisfy the following conditions (A) and (B): (A) 0.5≤(X+Y)≤2.0; (B) 0.80≤{X/(X+Y)}≤0.95.