Rolling device for electrode

1. A rolling device for an electrode comprising an all-solid electrolyte layer, the rolling device comprising:

a first roller comprising a plurality of first protrusions protruding from a surface of the first roller;

a second roller opposite the first roller, wherein the second roller comprises a plurality of second protrusions on a surface of the second roller;

a third roller disposed in a proceeding direction relative to the first roller;

a plurality of third protrusions protruding from a surface of the third roller;

a fourth roller disposed opposite the third roller; and

a plurality of fourth protrusions protruding from a surface of the fourth roller

wherein a height of the plurality of first protrusions relative to the surface of the first roller is greater than a height of the plurality of third protrusions relative to the surface of the second roller, and

a height of the plurality of second protrusions relative to the surface of the first roller is greater than a height of the plurality of fourth protrusions relative to the surface of the fourth roller.

2. The rolling device of claim 1 , wherein the plurality of first protrusions protrude about 1 micrometer to about 10 micrometers from the surface of the first roller, and

wherein the plurality of second protrusions protrude about 1 micrometer to about 10 micrometers from the surface of the second roller.

3. The rolling device of claim 1 , wherein a ratio of a total surface area of the plurality of first protrusions to a total surface area the surface of the first roller is in a range of about 1/5 to about 1/4, and

a ratio of a total surface area of the plurality of the second protrusions to a total surface area the surface of the second roller is in a range of about 1/5 to about 1/4.

4. The rolling device of claim 1 , wherein the plurality of first protrusions and the plurality of second protrusions comprise a protruding structure, a lattice structure, or a combination thereof.

5. The rolling device of claim 1 , further comprising a plurality of first gas receiving portions, wherein a first gas receiving portion of the plurality of first gas receiving portions is adjacent to a first protrusion of the plurality of first protrusions; and

a plurality of second gas receiving portions, wherein a second gas receiving portion of the plurality of gas receiving portions is adjacent to a second protrusion of the plurality of second protrusions.

6. The rolling device of claim 1 , further comprising a first stepped portion comprising a first step height from the surface of the first roller to a surface of the first stepped portion and disposed at an end of the first roller; and

a second stepped portion comprising a second step height from the surface of the second roller to a surface of the second stepped portion and disposed at an end of the second roller.

7. The rolling device of claim 1 , wherein a ratio of a total surface area of the plurality of third protrusions to a total surface area the surface of the third roller is in a range of about 1/5 to about 1/4, and

a ratio of a total surface area of the plurality of fourth protrusions to a total surface area of the surface the fourth roller is in a range of about 1/5 to about 1/4.

8. The rolling device of claim 1 , wherein the plurality of third protrusions and the plurality of fourth protrusions each independently comprise a dot structure, a lattice structure, or a combination thereof.

9. The rolling device of claim 1 , further comprising a plurality of third gas receiving portions, wherein a third gas receiving portion of the plurality of third gas receiving portions is disposed between third protrusions of the plurality of third protrusions; and

a plurality of fourth gas receiving portions, wherein a fourth gas receiving portion of the plurality of fourth gas receiving portions is disposed between fourth protrusions of the plurality of fourth protrusions.

10. The rolling device of claim 1 , further comprising:

a first stepped portion comprising a first step height from the surface of the first roller to a surface of the first stepped portion and disposed at an end of the first roller;

a second stepped portion comprising a second step height from the second roller to a surface of the second stepped portion and disposed at an end of the second roller;

a third stepped portion comprising a third step height from the surface of the third roller to a surface of the third stepped portion and disposed at an end of the third roller; and

a fourth stepped portion comprising a fourth step height from the surface of the fourth roller to a surface of the fourth stepped portion and disposed at an end of the fourth roller.

11. The rolling device of claim 1 , further comprising:

a fifth roller disposed in a proceeding direction relative to the third roller; and

a sixth roller opposite the fifth roller.

12. The rolling device of claim 11 , wherein both the fifth roller and the sixth roller comprise a flat surface without protrusions.

13. The rolling device of claim 11 , further comprising:

a first stepped portion comprising a first step height from the surface of the first roller to a surface of the first stepped portion and disposed at an end of the first roller;

a second stepped portion comprising a second step height from the second roller from the surface of the second roller to a surface of the second stepped portion and disposed at an end of the second roller;

a third stepped portion comprising a third step height from the surface of the third roller to a surface of the third stepped portion and disposed at an end of the third roller;

a fourth stepped portion comprising a fourth step height from the surface of the fourth roller to a surface of the fourth stepped portion and disposed at an end of the fourth roller;

a fifth stepped portion comprising a fifth step height from the surface of the fifth roller to a surface of the fifth stepped portion and disposed at an end of the fifth roller; and

a sixth stepped portion comprising a sixth step height from the surface of the sixth roller to a surface of the sixth stepped portion and disposed at an end of the sixth roller.

14. A rolling device for an electrode comprising an all-solid electrolyte layer, the rolling device comprising:

a first roller comprising a plurality of first protrusions protruding from a surface of the first roller;

a second roller opposite the first roller, wherein the second roller comprises a plurality of second protrusions on a surface of the second roller;

a third roller disposed in a proceeding direction relative to the first roller;

a plurality of third protrusions protruding from a surface of the third roller;

a fourth roller disposed opposite the third roller;

a plurality of fourth protrusions protruding from a surface of the fourth roller;

wherein the rolling device further comprises

a first stepped portion comprising a first step height from the surface of the first roller to a surface of the first stepped portion and disposed at an end of the first roller; a second stepped portion comprising a second step height from the second roller to a surface of the second stepped portion and disposed at an end of the second roller; a third stepped portion comprising a third step height from the surface of the third roller to a surface of the third stepped portion and disposed at an end of the third roller; and a fourth stepped portion comprising a fourth step height from the surface of the fourth roller to a surface of the fourth stepped portion and disposed at an end of the fourth roller, wherein the first step height is greater than the third step height, and the second step height is greater than the fourth step height; or

a fifth roller disposed in a proceeding direction relative to the third roller; and a sixth roller opposite the fifth roller, wherein both the fifth roller and the sixth roller comprise a flat surface without protrusions.

15. A rolling device for an electrode comprising an all-solid electrolyte layer, the rolling device comprising:

a first roller comprising a plurality of first protrusions protruding from a surface of the first roller;

a second roller opposite the first roller, wherein the second roller comprises a plurality of second protrusions on a surface of the second roller;

a third roller disposed in a proceeding direction relative to the first roller;

a plurality of third protrusions protruding from a surface of the third roller;

a fourth roller disposed opposite the third roller;

a plurality of fourth protrusions protruding from a surface of the fourth roller;

a fifth roller disposed in a proceeding direction relative to the third roller;

a sixth roller opposite the fifth roller,

a first stepped portion comprising a first step height from the surface of the first roller to a surface of the first stepped portion and disposed at an end of the first roller;

a second stepped portion comprising a second step height from the second roller from the surface of the second roller to a surface of the second stepped portion and disposed at an end of the second roller;

a third stepped portion comprising a third step height from the surface of the third roller to a surface of the third stepped portion and disposed at an end of the third roller;

a fourth stepped portion comprising a fourth step height from the surface of the fourth roller to a surface of the fourth stepped portion and disposed at an end of the fourth roller;

a fifth stepped portion comprising a fifth step height from the surface of the fifth roller to a surface of the fifth stepped portion and disposed at an end of the fifth roller; and

a sixth stepped portion comprising a sixth step height from the surface of the sixth roller to a surface of the sixth stepped portion and disposed at an end of the sixth roller,

wherein the first step height is greater than the third step height, and the third step height is greater than the fifth step height, and

the second step height is greater than the fourth step height, and the fourth step height is greater than the sixth step height.