Pellet form cathode for use in a biocompatible battery
Methods and apparatus to form biocompatible energization elements are described. In some examples, the methods and apparatus to form the biocompatible energization elements involve forming pellets comprising active cathode chemistry. The active elements of the cathode and anode are sealed with a biocompatible material. In some examples, a field of use for the methods and apparatus may include any biocompatible device or product that requires energization elements.
1. A method of forming a biocompatible energization element, the method comprising:
receiving a first substrate film of a first insulating material;
cutting a cavity in the first substrate film to form a cathode spacer layer, wherein an edge of the cavity defines a sidewall of the cavity;
receiving an anode film;
adhering a first surface of the cathode spacer layer to a first surface of the anode film;
depositing a separator into the biocompatible energization element through the cavity in the cathode spacer layer, wherein a material deposited as the separator comprises a polymerizable material;
receiving a cathode pellet; and
placing the cathode pellet into the cavity in the cathode spacer layer, wherein the sidewall of the cavity in the cathode spacer layer and a surface of the separator contain the cathode pellet.
2. The method of claim 1 further comprising
forming the cathode pellet from a cathode slurry.
3. The method of claim 2 wherein the forming of the cathode pellet involves shaping the cathode slurry by squeegee processing of the cathode slurry onto a masking layer comprising holes shaped as to form pellets, and wherein the masking layer is positioned upon a substrate.
4. The method of claim 3 wherein the substrate comprises a cathode current collector.
5. The method of claim 4 further comprising annealing the pellet and the substrate.
6. The method of claim 5 wherein the annealing is performed at a temperature approximately between 25 and 200 degrees Celsius.
7. The method of claim 5 wherein the annealing is performed at a temperature approximately between 25 and 600 degrees Celsius.
8. The method of claim 5 further comprising connecting the biocompatible energization element to an electroactive element within a biomedical device.
9. The method of claim 8 wherein the biomedical device is a contact lens.
10. The method of claim 2 wherein the forming the cathode pellet involves extruding slurry into pellet shaped deposits onto a substrate.
11. The method of claim 10 wherein the substrate comprises a cathode current collector.
12. The method of claim 11 further comprising annealing the pellet and the substrate.
13. The method of claim 12 further comprising connecting the biocompatible energization element to an electroactive element within a biomedical device.
14. The method of claim 13 wherein the biomedical device is a contact lens.
15. The method of claim 2 wherein the cathode pellet is received unconnected to any substrate.
16. The method of claim 15 further comprising adding a cathode current collector layer to a second surface of the cathode spacer layer, wherein the cathode current collector layer contacts a surface of the cathode pellet that has been placed into the cavity.
17. The method of claim 16 further comprising connecting the biocompatible energization element to an electroactive element within a biomedical device.
18. The method of claim 17 wherein the biomedical device is a contact lens.
19. The method of claim 2 further comprising:
forming a layer of cathode chemicals by spreading the cathode slurry upon a substrate;
drying the layer of cathode chemicals; and
cutting pellets from the layer of cathode chemicals with a knife edge press.
20. The method of claim 19 further comprising:
Sintering the layer of cathode chemicals upon a substrate.
21. The method of claim 19 wherein the cutting cuts the cathode chemicals and an underlying cathode current collector into the pellet.
22. The method of claim 21 further comprising sintering the pellet.
23. The method of claim 19 further comprising connecting the biocompatible energization element to an electroactive element within a biomedical device.
24. The method of claim 23 wherein the biomedical device is a contact lens.