Three-dimensional anode current collector for lithium batteries
A lithium metal battery has a cathode current collector, a cathode active material layer, an electrolyte, and an anode current collector host structure interfacing with the electrolyte. The anode current collector host structure comprises a conductive layer, a non-conductive layer on the conductive layer, and recesses formed through the non-conductive layer and into the conductive layer, each recess having an opening in the non-conductive layer with a width that is smaller than a largest width of the recess.
1. A lithium metal battery, comprising:
a cathode current collector;
a cathode active material layer;
an electrolyte; and
an anode current collector host structure interfacing with the electrolyte, the anode current collector host structure comprising:
a conductive layer;
a non-conductive layer on the conductive layer; and
recesses formed through the non-conductive layer and into the conductive layer, each of the recesses having an opening in the non-conductive layer with a width that is smaller than a largest width of a respective recess.
2. The lithium metal battery of claim 1 , wherein the width of the opening is 20% to 70% the largest width of the respective recess.
3. The lithium metal battery of claim 1 , wherein each of the recesses is a channel having a widest dimension that is larger than an opening of a respective channel.
4. The lithium metal battery of claim 1 , wherein the recess is a hole having a widest diameter that is larger than an opening of a respective hole.
5. The lithium metal battery of claim 1 , wherein each of the recesses has a depth and the anode current collector host structure has a thickness, and the depth is between 50% and 95% the thickness.
6. The lithium metal battery of claim 1 , wherein the anode current collector host structure has a first thickness, and the non-conductive layer has a second thickness, the second thickness being between 30% and 70% of the first thickness.
7. The lithium metal battery of claim 1 , wherein the non-conductive layer is non-conductive to ions and electrons.
8. The lithium metal battery of claim 1 , wherein the non-conductive layer is non-conductive to electrons.
9. The lithium metal battery of claim 8 , wherein the non-conductive layer comprises a solid ceramic electrolyte.
10. The lithium metal battery of claim 1 , wherein the electrolyte at least partially fills the recesses.
11. The lithium metal battery of claim 1 , further comprising:
an artificial SEI layer on a surface of the conductive layer within each of the recesses.
12. An anode current collector host structure configured to interface with an electrolyte, the anode current collector host structure comprising:
a conductive layer of metal;
a non-conductive layer formed on the conductive layer; and
recesses formed across an entire cathode-facing surface of the non-conductive layer, through the non-conductive layer and into the conductive layer, each of the recesses having an opening in a cathode-facing surface of the non-conductive layer with a width that is smaller than a largest width of a respective recess, wherein the electrolyte at least partially fills the recesses.
13. The anode current collector host structure of claim 12 , wherein the width of the opening of the recess is 20% to 70% the largest width of the respective recess.
14. The anode current collector host structure of claim 12 , wherein each of the recesses is a channel having a widest dimension that is larger than an opening of a respective channel.
15. The anode current collector host structure of claim 12 , wherein each of the recesses is a hole having a widest diameter that is larger than an opening of a respective hole.
16. The anode current collector host structure of claim 12 , wherein each of the recesses has a depth and the anode current collector host structure has a thickness, and the depth is between 50% and 95% the thickness.
17. The anode current collector host structure of claim 12 , wherein the anode current collector host structure has a first thickness, and the non-conductive layer has a second thickness, the second thickness being between 30% and 70% of the first thickness.
18. The anode current collector host structure of claim 12 , further comprising:
an artificial SEI layer on a surface of the conductive layer within each of the recesses.
19. The anode current collector host structure of claim 12 , wherein the non-conductive layer does not conduct electrons but does conduct ions and comprises a solid ceramic electrolyte.
20. A lithium metal battery, comprising:
a cathode current collector;
a cathode active material layer comprising a lithium transition metal oxide or a lithium transition metal phosphate;
an electrolyte that is a liquid, gel, polymer or combination thereof; and
an anode current collector host structure interfacing with the electrolyte, the anode current collector host structure comprising:
a conductive layer of metal;
a non-conductive layer formed on the conductive layer; and
recesses formed through the non-conductive layer and into the conductive layer, each of the recesses having an opening on a cathode-facing surface of the non-conductive layer with a width that is smaller than a largest width of a recess, the width of the opening being between 20% and 70% the largest width of the recess.