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US-20260128315-A1 - DISPERSANT POLYMER FOR NON-AQUEOUS SECONDARY BATTERY, COMPOSITION FOR NON-AQUEOUS SECONDARY BATTERY, SHEET FOR ALL-SOLID-STATE SECONDARY BATTERY AND ALL-SOLID-STATE SECONDARY BATTERY, AND MANUFACTURING METHOD OF SHEET FOR ALL-SOLID-STATE SECONDARY BATTERY AND ALL-SOLID-STATE SECONDARY BATTERY

US20260128315A1US 20260128315 A1US20260128315 A1US 20260128315A1US-20260128315-A1

Abstract

Provided are a dispersant polymer for a non-aqueous secondary battery, which has a constitutional component (X) including a polymerized chain and having a molecular weight of 400 or more, in which a viscosity at a temperature of 25° C. and a shear rate of 1 s −1 is 0.10 to 10,000 Pa·s; a composition for a non-aqueous secondary battery containing the dispersant polymer for a non-aqueous secondary battery; a sheet for an all-solid-state secondary battery and an all-solid-state secondary battery; and a manufacturing method of a sheet for an all-solid-state secondary battery and an all-solid-state secondary battery.

Inventors

  • Koji Yasuda
  • Yuzo Nagata
  • Ikuo Kinoshita

Assignees

  • FUJIFILM CORPORATION

Dates

Publication Date
20260507
Application Date
20251218
Priority Date
20230630

Claims (18)

  1. 1 . A dispersant polymer for a non-aqueous secondary battery, comprising: a constitutional component (X) which includes a polymerized chain and has a molecular weight of 400 or more, wherein a viscosity at a temperature of 25° C. and a shear rate of 1 s −1 is 0.10 to 10,000 Pa·s.
  2. 2 . The dispersant polymer for a non-aqueous secondary battery according to claim 1 , further comprising: a constitutional component (A) which has at least one polar functional group of the following group (a) of functional groups, <Group (a) of functional groups> a sulfonic acid group, a phosphoric acid group, a phosphonic acid group, a hydroxy group, a carboxy group, an oxetane group, an epoxy group, a dicarboxylic acid group, a thiol group, an ether group, a thioether group, a thioester group, an ester group, an amide group, a urethane group, a urea group, an imide group, a fluoroalkyl group, and salts of these groups.
  3. 3 . The dispersant polymer for a non-aqueous secondary battery according to claim 1 , wherein an SP value of a polymer chain in the dispersant polymer for a non-aqueous secondary battery is 15.0 to 25.0 MPa 1/2 .
  4. 4 . The dispersant polymer for a non-aqueous secondary battery according to claim 1 , wherein the dispersant polymer has a multibranched structure having a core portion and at least three polymeric arm portions.
  5. 5 . The dispersant polymer for a non-aqueous secondary battery according to claim 1 , wherein the dispersant polymer is a multibranched polymer represented by Formula (1), in Formula (1), L represents an n-valent linking group, P 1 represents a polymer chain, where n pieces of P 1 's may be the same or different from each other, and n represents an integer of 3 or more.
  6. 6 . A composition for a non-aqueous secondary battery, comprising: the dispersant polymer for a non-aqueous secondary battery according to claim 1 .
  7. 7 . The composition for a non-aqueous secondary battery according to claim 6 , further comprising: an inorganic solid electrolyte having ionic conductivity of a metal belonging to Group 1 or Group 2 in the periodic table.
  8. 8 . The composition for a non-aqueous secondary battery according to claim 7 , wherein the inorganic solid electrolyte is a sulfide-based inorganic solid electrolyte.
  9. 9 . The composition for a non-aqueous secondary battery according to claim 6 , further comprising: an active material.
  10. 10 . A sheet for an all-solid-state secondary battery, comprising: a layer formed of the composition for a non-aqueous secondary battery according to claim 6 .
  11. 11 . A sheet for an all-solid-state secondary battery, comprising: a layer formed of the composition for a non-aqueous secondary battery according to claim 7 .
  12. 12 . An all-solid-state secondary battery comprising, in the following order: a positive electrode active material layer; a solid electrolyte layer; and a negative electrode active material layer, wherein at least one of the positive electrode active material layer, the solid electrolyte layer, or the negative electrode active material layer is a layer formed of the composition for a non-aqueous secondary battery according to claim 6 .
  13. 13 . An all-solid-state secondary battery comprising, in the following order: a positive electrode active material layer; a solid electrolyte layer; and a negative electrode active material layer, wherein at least one of the positive electrode active material layer, the solid electrolyte layer, or the negative electrode active material layer is a layer formed of the composition for a non-aqueous secondary battery according to claim 7 .
  14. 14 . A manufacturing method of a sheet for an all-solid-state secondary battery, comprising: forming the composition for a non-aqueous secondary battery according to claim 6 into a film.
  15. 15 . A manufacturing method of an all-solid-state secondary battery, comprising: manufacturing an all-solid-state secondary battery through the manufacturing method according to claim 14 .
  16. 16 . The dispersant polymer for a non-aqueous secondary battery according to claim 2 , wherein the constitutional component (A) has at least one polar functional group of a sulfonic acid group, a phosphoric acid group, a phosphonic acid group, a hydroxy group, an oxetane group, an epoxy group, a thiol group, a thioether group, a thioester group, an amide group, a urethane group, a urea group, an imide group, a fluoroalkyl group, and salts of these groups.
  17. 17 . The dispersant polymer for a non-aqueous secondary battery according to claim 2 , wherein the constitutional component (A) has an amide group.
  18. 18 . The dispersant polymer for a non-aqueous secondary battery according to claim 1 , wherein the dispersant polymer has a graft structure.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Continuation of PCT International Application No. PCT/JP2024/023136 filed on Jun. 26, 2024, which claims priority under 35 U.S.C. § 119 (a) to Japanese Patent Application No. 2023-108490 filed in Japan on Jun. 30, 2023. Each of the above applications is hereby expressly incorporated by reference, in its entirety, into the present application. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispersant polymer for a non-aqueous secondary battery, a composition for a non-aqueous secondary battery, a sheet for an all-solid state secondary battery and an all-solid-state secondary battery, and a manufacturing method of a sheet for an all-solid-state secondary battery and an all-solid-state secondary battery. 2. Description of the Related Art A non-aqueous electrolyte secondary battery (also referred to as a non-aqueous secondary battery) is a storage battery which includes a negative electrode, a positive electrode, and a non-aqueous solution-based electrolyte between the negative electrode and the positive electrode, and is capable of charging and discharging by the reciprocal migration of specific metal ions such as lithium ions between both electrodes. As such a non-aqueous secondary battery, a non-aqueous electrolytic solution secondary battery which uses an organic electrolytic solution, and an all-solid-state secondary battery which uses a solid electrolyte layer are used in a wide range of use applications. In particular, in the all-solid-state secondary battery, all of the negative electrode, the electrolyte, and the positive electrode consist of solid, and the non-aqueous electrolytic solution secondary battery can greatly improve safety and reliability, which are said to be problems to be solved in a secondary battery in which an organic electrolytic solution is used. It is also said to be capable of extending battery life. Furthermore, the all-solid-state secondary battery can be provided with a structure in which the electrodes and the solid electrolyte are directly arranged in series. Therefore, with the all-solid-state secondary battery, it is possible to highly increase the energy density as compared with a non-aqueous electrolytic solution secondary battery, and thus the application to an electric vehicle or a large-sized storage battery is expected. In consideration of improving productivity and the like, a constituent layer (an electrode layer of a negative electrode active material layer and a positive electrode active material layer) in the non-aqueous electrolytic solution secondary battery and a constituent layer (a solid electrolyte layer, a negative electrode active material layer, a positive electrode active material layer, and the like) in the all-solid-state secondary battery are usually formed of a composition (constituent layer-forming material) containing a raw material compound constituting each layer, such as an active material and an inorganic solid electrolyte, a dispersant dispersing the raw material compound, a binder binding the raw material compound, and the like. Therefore, studies on the dispersant, the binder, and the constituent layer-forming material have been carried out. For example, JP2022-071849A discloses a (meth)acrylic polymer having a hydroxy group, which improves dispersibility of graphene used in combination with a positive electrode active material for the purpose of improving the battery service life of a lithium ion battery, and a graphene dispersion liquid containing the same. That is, JP2022-071849A discloses a graphene dispersion liquid containing, with respect to 100 parts by weight of graphene having an average thickness of 0.3 nm or more and 10 nm or less and a dispersion medium, a (meth)acrylic polymer having a hydroxy group in a proportion of 10 parts by weight or more and 300 parts by weight or less, in which a viscosity at a temperature of 25° C. and a shear rate of 1.0 s−1 is 0.1 Pa·s or more and 100 Pa or less. Specifically, a (meth)acrylic polymer-10 obtained by copolymerizing 2-hydroxyethyl methacrylate, BLEMMER PME-200, ethylhexyl acrylate, and acrylic acid is disclosed as the (meth)acrylic polymer. WO2023/068237A discloses “an inorganic solid electrolyte-containing composition containing: an inorganic solid electrolyte having an ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table; a polymer binder; and a dispersion medium, in which the polymer binder includes a graft polymer having a mass average molecular weight of 1,000 to 30,000 and dissolves in the dispersion medium, where graft polymer has a constitutional component (A) that contains at least one functional group of an amide group, an imide group, or a sulfonamide group, in a molecular chain that serves as a side chain of the polymer”. SUMMARY OF THE INVENTION As described above, since the constituent layer of the non-aqueous electrolytic solution secondary