Electrodes for three-dimensional lithium batteries and methods of manufacturing thereof
Various methods, systems, and apparatus for implementing aspects of the use of alloy anodes in three-dimensional lithium-ion batteries are disclosed, while accounting for volume change that occurs in these alloy anodes during charging and discharging. A three-dimensional lithium-ion battery according to certain embodiments comprises a battery enclosure, and an anode protruding from a first surface within the enclosure, with the anode having a first state and an expanded state, where the volume occupied by said anode is larger in the expanded state than in the first state. A first cathode is separated from the anode along a first direction, and a second cathode is separated from the anode along a second direction. A separator contacts the first cathode, the second cathode, and a portion of the anode. A gap is provided between the anode and the separator, the gap being larger in the first state than in the expanded state.
1. A three-dimensional lithium-ion battery comprising:
a battery enclosure;
an anode protruding from a surface of an anode substrate within said enclosure, said anode comprising a mass of anodically active material having a top, a bottom and sides extending continuously between the top and the bottom, the bottom being proximate the anode substrate surface, the top being distal to the anode substrate surface, the sides comprising a first and a second side, said anode having a first state and an expanded state that varies as a function of the state of charge of the three-dimensional battery, wherein the volume occupied by said anode is larger in said expanded state than in said first state;
a first cathode and a second cathode protruding from a surface of a cathode substrate within the enclosure, the cathode substrate surface opposing the anode substrate surface or being the same surface as the anode substrate surface, the anode and the first and second cathodes being interdigitated such that the anode is between the first and second cathodes with the first cathode being separated from the first side of the anode along a first direction lying within a plane that is parallel to the anode substrate surface and the second cathode being separated from the second side of the anode along a second direction lying within a plane that is parallel to the anode substrate surface;
a porous separator contacting said first and second cathodes, and surrounding the top and sides of said anode; and
a gap between said anode and said porous separator, said gap being larger in said first state than in said expanded state as measured in the first and second directions, wherein the volume defined by said gap is at least twenty percent smaller in said expanded state than in said first state.
2. The three-dimensional battery of claim 1 , wherein said anodically active material is capable of alloying with lithium.
3. The three-dimensional battery of claim 1 , wherein said first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface.
4. The three-dimensional battery of claim 2 , wherein said first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface.
5. The three-dimensional battery of claim 1 , wherein said porous separator comprises a conformal coating over said first cathode and said second cathode.
6. The three-dimensional battery of claim 1 , wherein said anodically active material is silicon.
7. The three-dimensional battery of claim 5 , wherein said first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface.
8. The three-dimensional battery of claim 6 , wherein said first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface.
9. The three-dimensional battery of claim 1 wherein the anode comprises an electrically conductive backbone and the anodically active material is between the electrically conductive backbone and the porous separator.
10. The three-dimensional battery of claim 1 wherein the anode comprises an electrically non-conductive backbone and the anodically active material is between the electrically non-conductive backbone and the porous separator.
11. The three-dimensional battery of claim 1 wherein the cathodes comprise an electrically conductive backbone and cathodically active material, the cathodically active material being between the electrically conductive backbone and the porous separator.
12. The three-dimensional battery of claim 1 wherein the cathodes comprise an electrically non-conductive backbone and cathodically active material, the cathodically active material being between the electrically non-conductive backbone and the porous separator.
13. The three-dimensional battery of claim 1 wherein the cathode substrate surface and the anode substrate surface are opposing surfaces.
14. The three-dimensional battery of claim 1 wherein the cathode substrate surface and the anode substrate surface are the same surface.
15. The three-dimensional battery of claim 1 wherein the battery comprises a plurality of anodes and a plurality of cathodes and the anodes and cathodes are in the shape of pillars.
16. The three-dimensional battery of claim 1 wherein the battery comprises a plurality of anodes and a plurality of cathodes and the anodes and cathodes are in the shape of bars.
17. The three-dimensional battery of claim 1 wherein the battery comprises a plurality of anodes and a plurality of cathodes and the anodes and cathodes have a circular shape.
18. The three-dimensional battery of claim 1 wherein the battery comprises a plurality of anodes and a plurality of cathodes and the anodes and cathodes have a wave shape.
19. The three-dimensional battery of claim 1 wherein said gap is between the porous separator and each of the first side, the second side and the top of the anode.
20. The three-dimensional battery of claim 1 wherein the porous separator contacts a portion of the mass of anodically active material.
21. The three-dimensional battery of claim 20 , wherein said first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface.
22. The three-dimensional battery of claim 20 , wherein said anodically active material is capable of alloying with lithium.
23. The three-dimensional battery of claim 22 , wherein said first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface.
24. The three-dimensional battery of claim 22 , wherein said porous separator comprises a conformal coating over said first cathode and said second cathode.
25. The three-dimensional battery of claim 20 , wherein said anodically active material is silicon.
26. The three-dimensional battery of claim 1 , wherein the porous separator contacts a portion of the mass of anodically active material, the first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface, and the volume defined by said gap is at least twenty percent smaller in said expanded state than in said first state.
27. The three-dimensional battery of claim 1 , wherein the porous separator contacts a portion of the mass of anodically active material, the first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface, and the cathode substrate surface and the anode substrate surface are opposing surfaces.
28. The three-dimensional battery of claim 1 , wherein the porous separator contacts a portion of the mass of anodically active material, the first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface, and the cathode substrate surface and the anode substrate surface are the same surfaces.
29. The three-dimensional battery of claim 1 , wherein the porous separator contacts a portion of the mass of anodically active material, the first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface, the battery comprises a plurality of anodes and a plurality of cathodes, the plurality of anodes protrude from the anode substrate surface, the plurality of cathodes protrude from the cathode substrate surface, and the anode substrate surface and the cathode substrate surface are opposing surfaces.
30. The three-dimensional battery of claim 1 , wherein the porous separator contacts a portion of the mass of anodically active material, the first direction and said second direction are between 150 degrees apart and 210 degrees apart within a plane that is parallel to the anode substrate surface, the battery comprises a plurality of anodes and a plurality of cathodes, the plurality of anodes protrude from the anode substrate surface, the plurality of cathodes protrude from the cathode substrate surface, and the anode substrate surface and the cathode substrate surface are the same surfaces.