Anode active material for non-aqueous electrolyte secondary battery, anode, battery, and laminate

1. An anode active material for a non-aqueous electrolyte secondary battery, the anode active material comprising:

an aluminum phase; and

a non-aluminum metal phase dispersed in the aluminum phase,

wherein the non-aluminum metal phase is formed of a non-aluminum metal compound containing one or more selected from the group consisting of Si, Ge, Sn, Ag, Sb, In, and Mg,

an amount of the non-aluminum metal phase with respect to a total amount of the aluminum phase and the non-aluminum metal phase is 0.01 mass % or more and 8 mass % or less, and

the non-aluminum metal phase observed in a case of observing a cross section of a foil-shaped anode active material having a thickness of 0.5 mm satisfies the following conditions (1) and (2),

condition (1): a number density of non-aluminum metal phase having a particle size of 0.1 μm 2 or more and less than 100 μm 2 is 1000 particles/mm 2 or less, condition (2): a number density of non-aluminum metal phase having a particle size of 100 μm 2 or more is 25 particles/mm 2 or less.

2. The anode active material for a non-aqueous electrolyte secondary battery according to claim 1 ,

wherein, in a binarized image obtained under image acquisition conditions set forth below, a ratio of an area corresponding to the non-aluminum metal phase to a sum of an area corresponding to the aluminum phase and the area corresponding to the non-aluminum metal phase is 10% or less,

the image acquisition conditions:

the anode active material for a non-aqueous electrolyte secondary battery is rolled into a foil having a thickness of 0.5 mm;

the foil is cut perpendicular to a rolling direction, and a cut surface is etched with a 1.0 mass % sodium hydroxide aqueous solution; and

a cross-sectional image of the cut surface is acquired, and the cross-sectional image is image-processed to obtain the binarized image.

3. The anode active material for a non-aqueous electrolyte secondary battery according to claim 1 ,

wherein the non-aluminum metal compound contains one or more selected from the group consisting of Si, Ge, Sn, Ag, Sb, and In.

4. The anode active material for a non-aqueous electrolyte secondary battery according to claim 1 ,

wherein the anode active material is a metal foil having a thickness of 5 μm or more and 200 μm or less.

5. The anode active material for a non-aqueous electrolyte secondary battery according to claim 1 ,

wherein the anode active material is a powder having an average particle size of 1 μm or more and 20 μm or less.

6. An anode comprising:

the anode active material for a non-aqueous electrolyte secondary battery according to claim 1 .

7. A battery comprising:

the anode according to claim 6 .

8. A laminate comprising:

a thin layer and a substrate which are laminated,

wherein the thin layer is formed of the anode active material for a non-aqueous electrolyte secondary battery according to claim 1 , and

the substrate is formed of a metal different from the anode active material for a non-aqueous electrolyte secondary battery.

9. An anode active material for a non-aqueous electrolyte secondary battery, the anode active material comprising:

an aluminum phase; and

a non-aluminum metal phase dispersed in the aluminum phase,

wherein the non-aluminum metal phase is formed of a non-aluminum metal compound containing one or more selected from the group consisting of Si, Ge, Sn, Ag, Sb, In, and Mg,

an amount of the non-aluminum metal phase with respect to a total amount of the aluminum phase and the non-aluminum metal phase is 0.005 mass % or more and 8 mass % or less, and

the non-aluminum metal phase observed in a case of observing a cross section of a foil-shaped anode active material having a thickness of 0.5 mm satisfies the following conditions (1) and (2),

condition (1): a number density of non-aluminum metal phase having a particle size of 0.1 μm 2 or more and less than 100 μm 2 is 1000 particles/mm 2 or less,

condition (2): a number density of non-aluminum metal phase having a particle size of 100 μm 2 or more is 25 particles/mm 2 or less.

10. The anode active material for a non-aqueous electrolyte secondary battery according to claim 9 ,

wherein, in a binarized image obtained under image acquisition conditions set forth below, a ratio of an area corresponding to the non-aluminum metal phase to a sum of an area corresponding to the aluminum phase and the area corresponding to the non-aluminum metal phase is 10% or less,

the image acquisition conditions:

the anode active material for a non-aqueous electrolyte secondary battery is rolled into a foil having a thickness of 0.5 mm;

the foil is cut perpendicular to a rolling direction, and a cut surface is etched with a 1.0 mass % sodium hydroxide aqueous solution; and

a cross-sectional image of the cut surface is acquired, and the cross-sectional image is image-processed to obtain the binarized image.

11. The anode active material for a non-aqueous electrolyte secondary battery according to claim 9 ,

wherein the non-aluminum metal compound contains one or more selected from the group consisting of Si, Ge, Sn, Ag, Sb, and In.

12. The anode active material for a non-aqueous electrolyte secondary battery according to claim 9 ,

wherein the anode active material is a metal foil having a thickness of 5 μm or more and 200 μm or less.

13. The anode active material for a non-aqueous electrolyte secondary battery according to claim 9 ,

wherein the anode active material is a powder having an average particle size of 1 μm or more and 20 μm or less.

14. An anode comprising:

the anode active material for a non-aqueous electrolyte secondary battery according to claim 9 .

15. A laminate comprising:

a thin layer and a substrate which are laminated,

wherein the thin layer is formed of the anode active material for a non-aqueous electrolyte secondary battery according to claim 9 , and

the substrate is formed of a metal different from the anode active material for a non-aqueous electrolyte secondary battery.