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.