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：US20170141394A1

公开(公告)日：2017-05-18

申请号：US15300304

申请日：2015-03-27

Applicant: Kureha Corporation

Inventor： Makoto IMAJI ,  Kayoko OKADA ,  Yasuhiro TADA ,  Naohiro SONOBE ,  Mayu KOMATSU

IPC: H01M4/587 ,  H01M10/0525

CPC classification number: H01M4/587 ,  C01B32/05 ,  C01P2004/61 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/40 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2220/20 ,  Y02E60/122 ,  Y02T10/7011

Abstract: Provided is a carbonaceous material for a non-aqueous electrolyte secondary battery anode having high discharge capacity per unit volume and excellent storage characteristics.The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a true density (ρBt) determined by a pycnometer method using butanol of not less than 1.55 g/cm3 and less than 1.75 g/cm3 and a discharge capacity of an anode at 0.05 V to 1.5 V in terms of a lithium reference electrode standard of not less than 180 mAh/g. Furthermore, the slope 0.9/X (Vg/Ah) of a discharge curve calculated from a discharge capacity X (Ah/g) and a potential difference of 0.9 (V) corresponding to 0.2 V to 1.1 V in terms of a lithium reference electrode standard is not greater than 0.75 (Vg/Ah), and an absorbed moisture quantity after storage for 100 hours in a 25° C. 50% RH air atmosphere is not greater than 1.5 wt %.

公开(公告)号：US20240322179A1

公开(公告)日：2024-09-26

申请号：US18262675

申请日：2022-01-25

Applicant: Kureha Corporation

Inventor： Haruki SAITO ,  Kayoko OKADA ,  Yasufumi IKEYAMA ,  Masataka KATONO

IPC: H01M4/62 ,  C08F14/22 ,  C08K5/12 ,  C08K5/134 ,  C08K5/1515 ,  C08K5/524 ,  H01M4/13

CPC classification number: H01M4/623 ,  C08F14/22 ,  C08K5/12 ,  C08K5/134 ,  C08K5/1515 ,  C08K5/524 ,  H01M4/13

Abstract: An object of the present application is to provide a binder for a non-aqueous electrolyte secondary battery having high adhesiveness to an active material and/or a current collector and also having high flexibility capable of withstanding bending in an electrode having a highly densified mixture layer. A binder for a non-aqueous electrolyte secondary battery, which achieves the object, contains: a vinylidene fluoride polymer having a vinylidene fluoride-derived structural unit as a main constituent component; and an additive having a specific structure, and a mass ratio of the vinylidene fluoride polymer to the additive is from 99/1 to 60/40:

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.