Solid electrolyte composition and method of manufacturing the same, solid electrolyte-containing sheet, electrode sheet for all-solid state secondary battery, and method of manufacturing all-solid state secondary battery

1. A solid electrolyte composition comprising:

an inorganic solid electrolyte; and

a dispersion medium (A), wherein the dispersion medium (A) includes a ketone compound (A1), and at least one dispersant (A2) selected from a ketone compound (A2-1) having a chemical structure different from the ketone compound (A1) or an alcohol compound (A2-2), the ketone compound (A1) has 6 or more carbon atoms, the ketone compound (A2-1) has 6 or more carbon atoms, and the alcohol compound (A2-2) has 6 or more carbon atoms.

2. The solid electrolyte composition according to claim 1 , further comprising an active material.

3. The solid electrolyte composition according to claim 1 , further comprising a conductive auxiliary agent.

4. The solid electrolyte composition according to claim 1 , wherein a content ratio of the dispersant (A2) in the dispersion medium (A) is more than 0% by mass and less than 50% by mass.

5. The solid electrolyte composition according to claim 1 , wherein the ketone compound (A2-1) has 9 or more carbon atoms.

6. The solid electrolyte composition according to claim 1 , wherein at least one dispersant (A2) is a structural isomer of the ketone compound (A1).

7. The solid electrolyte composition according to claim 1 , wherein the dispersion medium (A) includes at least one non-polar dispersant.

8. The solid electrolyte composition according to claim 1 , wherein a median diameter of an active material is larger than a median diameter of the inorganic solid electrolyte.

9. A solid electrolyte-containing sheet having a layer formed of the solid electrolyte composition according to claim 1 .

10. A method of manufacturing a solid electrolyte composition comprising:

a step of dispersing an inorganic solid electrolyte in a dispersion medium (A),

wherein the dispersion medium (A) includes a ketone compound (A1), and at least one dispersant (A2) selected from a ketone compound (A2-1) having a chemical structure different from the ketone compound (A1) or an alcohol compound (A2-2), the ketone compound (A1) has 6 or more carbon atoms, the ketone compound (A2-1) has 6 or more carbon atoms, and the alcohol compound (A2-2) has 6 or more carbon atoms.

11. The method of manufacturing a solid electrolyte composition according to claim 10 , wherein a content ratio of the dispersant (A2) in the dispersion medium (A) is more than 0% by mass and less than 50% by mass.

12. The method of manufacturing a solid electrolyte composition according to claim 10 , wherein the ketone compound (A2-1) has 9 or more carbon atoms.

13. The method of manufacturing a solid electrolyte composition according to claim 10 , wherein at least one dispersant (A2) is a structural isomer of the ketone compound (A1).

14. The method of manufacturing a solid electrolyte composition according to claim 10 , wherein the dispersion medium (A) includes at least one non-polar dispersant.

15. The method of manufacturing a solid electrolyte composition according to claim 10 , further comprising a step of mixing an active material and a preliminary dispersion obtained after the dispersing step.

16. The method of manufacturing a solid electrolyte composition according to claim 15 , wherein the mixing step is a step of mixing the preliminary dispersion, the active material, and a conductive auxiliary agent.

17. A method of manufacturing an electrode sheet for an all-solid state secondary battery comprising the method of manufacturing a solid electrolyte composition according to claim 10 .

18. A method of manufacturing an all-solid state secondary battery comprising the method of manufacturing a solid electrolyte composition according to claim 10 .

19. The method of manufacturing an all-solid state secondary battery according to claim 18 , wherein a solid electrolyte composition and a solid electrolyte composition containing an active material are simultaneously applied for multi-layer coating to form a solid electrolyte layer and an active material layer, and

at least one of the solid electrolyte composition or the solid electrolyte composition containing the active material is manufactured by a method of manufacturing a solid electrolyte composition comprising:

a step of dispersing an inorganic solid electrolyte in a dispersion medium (A),

wherein the dispersion medium (A) includes a ketone compound (A1), and at least one dispersant (A2) selected from a ketone compound (A2-1) having a chemical structure different from the ketone compound (A1) or an alcohol compound (A2-2), the ketone compound (A1) has 6 or more carbon atoms, the ketone compound (A2-1) has 6 or more carbon atoms, and the alcohol compound (A2-2) has 6 or more carbon atoms.