公开(公告)号：US12249709B2

公开(公告)日：2025-03-11

申请号：US17047384

申请日：2019-04-26

Applicant: Denka Company Limited

Inventor： Tatsuya Nagai ,  Shinichiro Osumi ,  Tetsuya Ito

IPC: H01M4/525 ,  H01M4/02 ,  H01M4/131 ,  H01M4/133 ,  H01M10/0525

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.

公开(公告)号：US12176515B2

公开(公告)日：2024-12-24

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 ,  H01M4/02

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：US12132204B2

公开(公告)日：2024-10-29

申请号：US17295235

申请日：2019-11-28

Applicant: Denka Company Limited

Inventor： Tatsuya Nagai ,  Shinichiro Osumi ,  Tetsuya Ito

IPC: H01M4/58 ,  H01M4/62 ,  H01M10/0525 ,  H01M4/02

CPC classification number: H01M4/58 ,  H01M4/625 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/028 ,  H01M2300/0028

Abstract: A composition for a positive electrode of a lithium ion secondary battery, the composition comprising:



an active material capable of storing and extracting lithium ion; and
an electric conductive material,
wherein the active material is lithium iron phosphate,
wherein the conductive material includes carbon black and carbon nanotube,
wherein the carbon black has an average primary particle diameter of 39 nm or less, and
wherein the carbon nanotube has an average diameter of 20 nm or less.

公开(公告)号：US20190177551A1

公开(公告)日：2019-06-13

申请号：US16327265

申请日：2017-08-08

Applicant: DENKA COMPANY LIMITED

Inventor： Tatsuya Nagai ,  Shinichiro Osumi ,  Daiki Ikeda ,  Tetsuya Ito ,  Hiroshi Yokota

IPC: C09C1/54 ,  H01M4/1393 ,  H01M4/133 ,  H01B1/24

Abstract: An object of the present invention is to provide a carbon black for batteries having excellent dispersibility, electron conductivity and oxidation resistance. In addition, an object of the present invention is to provide a low-viscosity conductive composition for an electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition.A carbon black for batteries having: BET specific surface area of 50 to 220 m2/g; a crystallite diameter (La) of 30 to 42 Å; and a number of CO2 desorption molecules per unit surface area measured by a temperature-rising desorption gas analysis method (50° C. to 1200° C. of measurement temperature) of 8.0×1016 to 15.0×1016 molecules/m2 is excellent in dispersibility, electron conductivity and oxidation resistance. A conductive composition for a low-viscosity electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition can be obtained.

公开(公告)号：US11098201B2

公开(公告)日：2021-08-24

申请号：US16327265

申请日：2017-08-08

Applicant: DENKA COMPANY LIMITED

Inventor： Tatsuya Nagai ,  Shinichiro Osumi ,  Daiki Ikeda ,  Tetsuya Ito ,  Hiroshi Yokota

IPC: C09C1/54 ,  H01B1/04 ,  H01M4/62 ,  C09C1/00 ,  H01B1/24 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/13 ,  H01M10/052

Abstract: An object of the present invention is to provide a carbon black for batteries having excellent dispersibility, electron conductivity and oxidation resistance. In addition, an object of the present invention is to provide a low-viscosity conductive composition for an electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition.
A carbon black for batteries having: BET specific surface area of 50 to 220 m2/g; a crystallite diameter (La) of 30 to 42 Å; and a number of CO2 desorption molecules per unit surface area measured by a temperature-rising desorption gas analysis method (50° C. to 1200° C. of measurement temperature) of 8.0×1016 to 15.0×1016 molecules/m2 is excellent in dispersibility, electron conductivity and oxidation resistance. A conductive composition for a low-viscosity electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition can be obtained.

公开(公告)号：US11028209B2

公开(公告)日：2021-06-08

申请号：US16320646

申请日：2017-07-14

Applicant: Denka Company Limited

Inventor： Tatsuya Nagai ,  Takuya Narutomi ,  Tetsuya Ito ,  Hiroshi Yokota

IPC: H01M4/505 ,  H01M4/525 ,  H01M4/62 ,  H01M4/58 ,  H01M4/1391 ,  H01M10/0525 ,  C08F261/04 ,  C08L27/16 ,  C08F20/44 ,  C08K3/04

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：US11637290B2

公开(公告)日：2023-04-25

申请号：US17605814

申请日：2020-04-17

Applicant: DENKA COMPANY LIMITED

Inventor： Akira Yoda ,  Tatsuya Nagai ,  Tetsuya Ito

IPC: C09C1/48 ,  H01M4/62 ,  C09C1/56 ,  H01M4/04 ,  H01M4/1391 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525

Abstract: A slurry including at least a carbon black and a dispersion medium, wherein a concentration of the carbon black in the slurry is 5% by mass or more and 25% by mass or less, and wherein in a volume-based frequency distribution of particle size of the carbon black measured by a laser diffraction/scattering method, provided that a volume concentration of carbon black with a particle size of 0.6 μm or more is x (%), a volume concentration of carbon black with a particle size of 0.3 μm or more and less than 0.6 μm is y (%), and a volume concentration of carbon black having a particle size of less than 0.3 μm is 100−(x+y) (%), the slurry satisfies 10≤x≤70, 30≤y≤90, and 0≤100−(x+y)≤30.

公开(公告)号：US11015067B2

公开(公告)日：2021-05-25

申请号：US16637265

申请日：2018-08-06

Applicant: DENKA COMPANY LIMITED

Inventor： Yoko Horikoshi ,  Tetsuya Ito

IPC: H01B1/24 ,  C09D5/24 ,  C09D7/40 ,  C09D5/02 ,  C09D111/00 ,  C09D175/04 ,  F03G7/06 ,  C08K3/04

Abstract: According to one of various aspects of the present invention, a slurry for a flexible electrode contains a component (a) dispersed in an aqueous emulsion. The emulsion includes one or more polymer components selected from the group consisting of acrylic polymers, urethane polymers, fluorine polymers, urea polymers, chloroprene polymers, and butadiene polymers. The emulsion has a pH of 6.5 to 8.0. In the slurry, the total of the polymer component(s) and the component (a) is 20 to 30% by mass. Of the total of the polymer component(s) and the component (a) in the slurry, the polymer component(s) is 60 to 85% by mass, and the component (a) is 15 to 40% by mass. Component (a) is carbon black having a DBP absorption amount under uncompressed conditions of 150 to 300 mL/100 g and a BET specific surface area of 35 to 140 m2/g.

公开(公告)号：US11658278B2

公开(公告)日：2023-05-23

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: C09C1/56 ,  H01M4/04 ,  H01M4/1393 ,  H01M4/62 ,  H01M4/02

CPC classification number: H01M4/0416 ,  C09C1/56 ,  H01M4/1393 ,  H01M4/622 ,  H01M2004/028

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)