Electrode sheet for all-solid state secondary battery, all-solid state secondary battery, method of manufacturing electrode sheet for all-solid state secondary battery, and method of manufacturing all-solid state secondary battery

1. An electrode sheet for an all-solid state secondary battery, the electrode sheet comprising a current collector, a primer layer, and an electrode active material layer in this order,

wherein the primer layer includes a binder (A 1 ),

the electrode active material layer includes an inorganic solid electrolyte (B) having ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table, an active material (C), and binder particles (D) having an average particle size of 1 nm to 10 μm and further includes a binder (A 2 ) on at least an adhesive interface side with the primer layer, the binder (A 1 ) and the binder (A 2 ) are made of a same material, and

a crosslinked structure is not formed between the binder (A 2 ) and the inorganic solid electrolyte (B), wherein

a Bet mass % is a ratio of a content of the binder (A 2 ) in an electrode active material layer ET to a total content of the binder (A 2 ) and the binder particles (D) in the electrode active material layer ET, a Bes mass % is a ratio of a content of the binder (A 2 ) in an electrode active material layer ES to a total content of the binder (A 2 ) and the binder particles (D) in the electrode active material layer ES, and (Bet mass %/Bes mass %)>1,

wherein the electrode active material layer is equally divided into ten sub layers in a thickness direction and the ten sub layers are represented by a to j layers, respectively, in order from a sub layer in contact with the primer layer, the electrode active material layer ET represents the a layer and the electrode active material layer ES represents a layer including the b to j layers.

2. The electrode sheet for an all-solid state secondary battery according to claim 1 ,

wherein a content of the binder (A 2 ) decreases from a side of the electrode active material layer facing the current collector toward a side of the electrode active material layer opposite to the current collector.

3. The electrode sheet for an all-solid state secondary battery according to claim 1 ,

wherein a Log P value of a dispersion medium that disperses the binder particles (D) and a Log P value of a solvent that dissolves the binder (A 2 ) are 0.5 or higher.

4. The electrode sheet for an all-solid state secondary battery according to claim 1 ,

wherein the binder particles (D) are polyamide particles, polyimide particles, polyurea particles, fluorine-containing resin particles, hydrocarbon resin particles, urethane resin particles, or acrylic resin particles.

5. The electrode sheet for an all-solid state secondary battery according to claim 1 ,

wherein a compound forming the binder (A 1 ) and the binder (A 2 ) is different from a compound forming the binder particles (D).

6. The electrode sheet for an all-solid state secondary battery according to claim 1 ,

wherein the binder (A 1 ) and the binder (A 2 ) are respectively a hydrocarbon resin.

7. The electrode sheet for an all-solid state secondary battery according to claim 1 ,

wherein the binder particles (D) have at least one in the following group of functional groups,

<Group of Functional Groups>

an acidic functional group, a basic functional group, a hydroxy 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.

8. The electrode sheet for an all-solid state secondary battery according to claim 1 ,

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

9. The electrode sheet for an all-solid state secondary battery according to claim 1 ,

wherein the electrode active material layer is peeled off from the current collector, a peel strength is 60 N/m or higher.

10. An all-solid state secondary battery comprising:

the electrode sheet for an all-solid state secondary battery according to claim 1 .

11. A method of manufacturing the electrode sheet for an all-solid state secondary battery according to claim 1 , the method comprising:

a step of forming the primer layer on the current collector and forming the electrode active material layer on the primer layer,

wherein by transferring a part of the binder (A 1 ) in the primer layer to the electrode active material layer in the step, the electrode active material layer includes the binder (A 2 ) on at least an adhesive interface side with the primer layer.

12. A method of manufacturing an all-solid state secondary battery, the method comprising:

obtaining an electrode sheet for an all-solid state secondary battery using the method according to claim 11 and manufacturing an all-solid state secondary battery using the electrode sheet for an all-solid state secondary battery.