公开(公告)号：US20240072233A1

公开(公告)日：2024-02-29

申请号：US18032992

申请日：2021-10-21

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA ,  KUREHA CORPORATION

Inventor： Shingo KOMURA ,  Yoshiyuki NAGASAWA ,  Mitsuyasu SAKUMA

IPC: H01M4/04 ,  H01M4/1391 ,  H01M4/62

CPC classification number: H01M4/0433 ,  H01M4/0404 ,  H01M4/1391 ,  H01M4/623

Abstract: A method for producing an electrode member that configures an electrode body of an all-solid-state battery, including: a slurry preparation step for preparing a mixed material slurry that contains at least a binder, solid electrolyte particles, and a nonaqueous solvent with low polarity; a molding step for molding the mixed material slurry into a desired shape; and a drying step for obtaining a molded body by removing the nonaqueous solvent with low polarity from the mixed material slurry after the molding. Then, the temperature of the mixed material slurry is controlled so as not to cause re-crystallization of the binder, which has been dissolved in the nonaqueous solvent with low polarity, at least until the initiation of the molding step. Consequently, it is possible to stably provide an all-solid-state battery that has low battery resistance, while improving electrode member production efficiency by preventing gelation of a mixed material slurry.

公开(公告)号：US20210380791A1

公开(公告)日：2021-12-09

申请号：US17339026

申请日：2021-06-04

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA ,  KUREHA CORPORATION

Inventor： Naoki OSADA ,  Shohei KAWASHIMA ,  Ryosuke FURUYA ,  Yoshiyuki NAGASAWA ,  Mitsuyasu SAKUMA

IPC: C08L27/16 ,  H01M4/62 ,  H01M10/0525 ,  H01M10/0562 ,  H01M50/403 ,  H01M50/449 ,  C08J3/28

Abstract: A binder composition includes a dispersion medium and a group of binder particles. The group of binder particles is dispersed in the dispersion medium. The group of binder particles include a polymer material. The polymer material includes a constitutional unit originated from vinylidene difluoride. The group of binder particles has a number-based particle size distribution. The particle size distribution satisfies the following conditions: “0.19≤X≤0.26”, “0.69≤Y≤0.76”, and “0≤Z≤0.05”. Here, “X” represents a frequency of particles each having a particle size of less than or equal to 40 μm. “Y” indicates a frequency of particles each having a particle size of more than 40 μm and less than or equal to 110 μm. “Z” indicates a frequency of particles each having a particle size of more than 110 μm and less than or equal to 250 μm.

公开(公告)号：US20210179756A1

公开(公告)日：2021-06-17

申请号：US16485585

申请日：2018-01-18

Applicant: Kureha Corporation

Inventor： Kayoko OKADA ,  Yoshiyuki NAGASAWA ,  Aya OIKAWA ,  Yumeno SUZUKI ,  Shota KOBAYASHI

IPC: C08F214/22 ,  C09D127/16 ,  H01M50/449 ,  H01M50/426 ,  H01M50/46

Abstract: Provided is a vinylidene fluoride copolymer particle which is capable of efficiently exhibiting high adhesion between an electrode and a separator. The vinylidene fluoride copolymer particle of the present invention comprises vinylidene fluoride; and a compound having an oxygen atom-containing functional group; wherein a ratio of oxygen atom in a surface of the vinylidene fluoride copolymer particle is higher than a ratio of oxygen atom in the vinylidene fluoride copolymer particle other than the surface thereof.

公开(公告)号：US20240243291A1

公开(公告)日：2024-07-18

申请号：US18615055

申请日：2024-03-25

Applicant: KUREHA CORPORATION

Inventor： Aya SHIKE ,  Yoshiyuki NAGASAWA ,  Tamito IGARASHI

IPC: H01M4/62 ,  H01M10/0565

CPC classification number: H01M4/623 ,  H01M10/0565

Abstract: A vinylidene fluoride copolymer composition having stable dispersibility in a dispersion medium over a long period of time, the composition having a melting temperature of 140° C. or lower, a reversing heat flow of the composition has endothermic peaks having an amount of enthalpy of fusion of 2 J/g or more, and an absolute value of a difference between a temperature showing a largest endothermic peak among the endothermic peaks and the melting temperature of the composition is 10° C. or lower. When a dispersion containing butyl butyrate and the vinylidene fluoride copolymer composition (vinylidene fluoride content rate of 10 mass %) is left to stand for 20 hours, a content rate of the vinylidene fluoride copolymer composition in an upper 20 vol % of the dispersion after the dispersion is left to stand is 4.0 mass % or more and 10 mass % or less.

公开(公告)号：US20210210783A1

公开(公告)日：2021-07-08

申请号：US17059108

申请日：2019-02-21

Applicant: Kureha Corporation

Inventor： Yoshiyuki NAGASAWA ,  Aya SHIKE

IPC: H01M10/0565 ,  H01M10/0525 ,  H01M4/04 ,  H01M50/449 ,  C08L27/16 ,  C08K5/02 ,  H01M4/62 ,  C08L27/20

Abstract: A resin composition for a non-aqueous electrolyte secondary battery that includes a vinylidene fluoride copolymer having a constituent unit derived from vinylidene fluoride and a constituent unit derived from a fluorine-containing alkyl vinyl compound. A melting point, measured in accordance with ASTM D3418, of the vinylidene fluoride copolymer is from 105° C. to 125° C., and a mass fraction Wa of the constituent unit derived from the fluorine-containing alkyl vinyl compound in the vinylidene fluoride copolymer, a degree of crystallinity DC of the vinylidene fluoride copolymer, and a degree of amorphicity DA of the vinylidene fluoride copolymer satisfy Equation (1) below: 4.7≤Wa×(DC/DA)≤14  (1)

公开(公告)号：US20240301105A1

公开(公告)日：2024-09-12

申请号：US18254795

申请日：2021-11-25

Applicant: KUREHA CORPORATION

Inventor： Aya SHIKE ,  Yoshiyuki NAGASAWA ,  Tamito IGARASHI

IPC: C08F214/22 ,  C08F214/28 ,  H01M4/62 ,  H01M10/056

CPC classification number: C08F214/22 ,  C08F214/28 ,  C08F2800/20 ,  H01M4/623 ,  H01M10/056

Abstract: A vinylidene fluoride copolymer composition having stable dispersibility in a dispersion medium over a long period of time, the composition having a melting temperature of 140° C. or lower, a reversing heat flow of the composition has endothermic peaks having an amount of enthalpy of fusion of 2 J/g or more, and an absolute value of a difference between a temperature showing a largest endothermic peak among the endothermic peaks and the melting temperature of the composition is 10° C. or lower. When a dispersion containing butyl butyrate and the vinylidene fluoride copolymer composition (vinylidene fluoride content rate of 10 mass %) is left to stand for 20 hours, a content rate of the vinylidene fluoride copolymer composition in an upper 20 vol % of the dispersion after the dispersion is left to stand is 4.0 mass % or more and 10 mass % or less.

公开(公告)号：US20220177689A1

公开(公告)日：2022-06-09

申请号：US17593660

申请日：2020-03-16

Applicant: Kureha Corporation

Inventor： Aya SHIKE ,  Yoshiyuki NAGASAWA ,  Yasuhiro SUZUKI

IPC: C08L27/16

Abstract: The vinylidene-fluoride-based polymer composition according to the present invention comprises a vinylidene-fluoride-based polymer and a specific surfactant and contains no fluorinated surfactant, wherein the specific surfactant is contained in an amount of 10 ppm or larger but less than 100 ppm in terms of mass ppm of the solid components of the composition and has an HLB value of 10 or greater. The method for producing a vinylidene-fluoride-based polymer according to the present invention comprises emulsion-polymerizing specific monomers in an aqueous medium in the presence of a specific emulsifier and an initiator without using any fluorinated surfactant, the use amount of the emulsifier being 8.5 ppm or larger but less than 100 ppm in terms of mass ppm of the monomers.

公开(公告)号：US20250002622A1

公开(公告)日：2025-01-02

申请号：US18697184

申请日：2022-09-29

Applicant: Kureha Corporation

Inventor： Nozomu ODAGAWA ,  Yoshiyuki NAGASAWA

IPC: C08F214/22

Abstract: A vinylidene fluoride polymer solution in which a vinylidene fluoride polymer is dissolved in a solvent that has a lower environmental impact and is easy to handle. The vinylidene fluoride polymer solution contains a vinylidene fluoride polymer and a solvent. The solvent includes an affinity solvent having a molecular weight of 100 or more and containing at least one structure selected from ethers, ketones, and esters, and the vinylidene fluoride polymer satisfies some specific requirements.

公开(公告)号：US20240120492A1

公开(公告)日：2024-04-11

申请号：US18546202

申请日：2022-02-14

Applicant: Kureha Corporation

Inventor： Aya SHIKE ,  Yoshiyuki NAGASAWA ,  Tamito IGARASHI

IPC: H01M4/62 ,  C08F214/22 ,  C08L27/16 ,  H01M4/13 ,  H01M10/0562

CPC classification number: H01M4/623 ,  C08F214/22 ,  C08L27/16 ,  H01M4/13 ,  H01M10/0562 ,  C08L2201/56 ,  C08L2203/20 ,  H01M2300/008

Abstract: Provided are a binder solution, an electrode mixture, an electrode, and an all-solid-state battery, which use an organic solvent having low reactivity with a solid electrolyte and in which a binder easily dissolves. The binder solution for an all-solid-state battery contains: a binder made of a vinylidene fluoride polymer; and an organic solvent. The organic solvent is at least one selected from the group consisting of a cyclic ether, a ketone, and an ester. The organic solvent has a boiling point of 60° C. or higher and 160° C. or lower. A residual moisture content of the organic solvent is 300 ppm or less.

公开(公告)号：US20240010826A1

公开(公告)日：2024-01-11

申请号：US18254490

申请日：2021-11-25

Applicant: Kureha Corporation

Inventor： Takuya IKEDA ,  Tamito IGARASHI ,  Masataka KATONO ,  Kayoko OKADA ,  Yoshiyuki NAGASAWA

IPC: C08L27/16 ,  C08K5/42 ,  H01M4/62 ,  H01M4/139

CPC classification number: C08L27/16 ,  C08K5/42 ,  H01M4/623 ,  H01M4/139 ,  C08L2201/52

Abstract: An objective is to provide a vinylidene fluoride polymer composition that is difficult to swell and dissolve in N-methyl-2-pyrrolidone and can form an electrode with a smooth surface. The vinylidene fluoride polymer composition contains a vinylidene fluoride polymer with a melting point of 130° C. or higher. When the vinylidene fluoride polymer composition and N-methyl-2-pyrrolidone are mixed to prepare a vinylidene fluoride polymer dispersion with a content of the vinylidene fluoride polymer of 6 mass %, a ratio of a viscosity of the vinylidene fluoride polymer dispersion at 30° C. to a viscosity of N-methyl-2-pyrrolidone at 30° C. is 20 or less, and when the vinylidene fluoride polymer dispersion is stirred and then allowed to stand for 15 minutes, a rate of change in content of the vinylidene fluoride polymer in an upper 40 volume % area of the vinylidene fluoride polymer dispersion before and after the standing is 2 mass % or less.