Solid electrolyte composition, solid electrolyte-containing sheet and manufacturing method therefor, all-solid state secondary battery and manufacturing method therefor, and polymer and non-aqueous solvent dispersion thereof

1. A solid electrolyte composition comprising:

an inorganic solid electrolyte (A) having a conductivity of an ion of a metal belonging to Group I or II of the periodic table; and

a binder (B),

wherein the binder (B) is a polymer having a main chain and a graft structure,

wherein at least one bond of a urethane bond, a urea bond, an amide bond, an imide bond, or an ester bond is included between components constituting the main chain, and

wherein a number-average molecular weight of the graft structure is 1,000 or more.

2. The solid electrolyte composition according to claim 1 ,

wherein the binder (B) has, in the graft structure, at least one selected from a carboxylic acid group, a sulfonic acid group, a phosphoric acid group, a hydroxy group, an amino group, a cyano group, an alkoxysilyl group, an aryl group, a heteroaryl group, and a hydrocarbon ring group in which three or more rings are fused.

3. The solid electrolyte composition according to claim 1 ,

wherein the graft structure is made of an acrylic polymer.

4. The solid electrolyte composition according to claim 1 ,

wherein a glass transition temperature of the graft structure is 25° C. or lower.

5. The solid electrolyte composition according to claim 1 ,

wherein the binder (B) includes a hard segment having at least one bond of a urethane bond, a urea bond, an amide bond, or an imide bond in the main chain.

6. The solid electrolyte composition according to claim 1 ,

wherein the binder (B) includes a hydrocarbon polymer segment in the main chain.

7. The solid electrolyte composition according to claim 1 ,

wherein the binder (B) is a particulate polymer having an average particle diameter of 10 nm to 1,000 nm.

8. The solid electrolyte composition according to claim 1 , further comprising:

a dispersion medium (C).

9. The solid electrolyte composition according to claim 1 , further comprising:

an active material (D).

10. The solid electrolyte composition according to claim 1 , further comprising:

a conductive auxiliary agent (E).

11. The solid electrolyte composition according to claim 1 ,

wherein the inorganic solid electrolyte (A) is a sulfide-based inorganic solid electrolyte.

12. The solid electrolyte composition according to claim 1 ,

wherein a content of the binder (B) is 0.1% by mass or more and less than 20% by mass of a total solid content.

13. A solid electrolyte-containing sheet comprising:

an inorganic solid electrolyte (A) having a conductivity of an ion of a metal belonging to Group I or II of the periodic table; and

a binder (B),

wherein the binder (B) is a polymer having a main chain and a graft structure,

wherein at least one bond of a urethane bond, a urea bond, an amide bond, an imide bond, or an ester bond is included between components constituting the main chain, and

wherein a number-average molecular weight of the graft structure is 1,000 or more.

14. A method for manufacturing the solid electrolyte-containing sheet according to claim 13 , the method comprising:

a step of applying a solid electrolyte composition containing the inorganic solid electrolyte (A), the binder (B), and a dispersion medium (C) onto a base material; and

a step of drying the applied solid electrolyte composition.

15. An all-solid state secondary battery comprising:

a positive electrode active material layer;

a negative electrode active material layer; and

a solid electrolyte layer,

wherein at least one of the positive electrode active material layer, the negative electrode active material layer, or the solid electrolyte layer contains an inorganic solid electrolyte (A) having a conductivity of an ion of a metal belonging to Group I or II of the periodic table and a binder (B),

wherein the binder (B) is a polymer having a main chain and a graft structure,

wherein at least one bond of a urethane bond, a urea bond, an amide bond, an imide bond, or an ester bond is included between components constituting the main chain, and

wherein a number-average molecular weight of the graft structure is 1,000 or more.

16. A method for manufacturing an all-solid state secondary battery,

wherein an all-solid state secondary battery is manufactured using the method for manufacturing a solid electrolyte-containing sheet according to claim 14 .