Dual electrolyte electrochemical cells, systems, and methods of manufacturing the same
Embodiments described herein relate generally to electrochemical cells having dual electrolytes, systems of such electrochemical cells, and methods for manufacturing the same. In some embodiments, electrochemical cells can include a cathode disposed on a cathode current collector, an anode disposed on an anode current collector, and a separator disposed therebetween. In some embodiments, the separator can include materials that fluidically and/or chemically isolate the anode from the cathode. In some embodiments, the cathode and/or anode can include a slurry of an active material and a conductive material in a liquid electrolyte. In some embodiments, the anode can be fluidically coupled to an anode degassing port. In some embodiments, the cathode can be fluidically coupled to a cathode degassing port.
1. An electrochemical cell, comprising:
an anode including anode current collector, anode material, and an anolyte;
a cathode including cathode current collector, cathode material, and an catholyte;
a selectively permeable membrane disposed between the anode and the cathode, the selectively permeable membrane configured to chemically and/or fluidically isolate the anode from the cathode;
an anode degassing port fluidically coupled to the anode and fluidically isolated from the cathode, the anode degassing port existing in a first state in which the anode degassing port fluidically couples the anode to a first region exterior to the electrochemical cell and a second state in which the anode degassing port is closed, such that the anode is fluidically isolated from the first region; and
a cathode degassing port fluidically coupled to the cathode and fluidically isolated from the anode, the cathode degassing port existing in a first state in which the cathode degassing port fluidically couples the anode to a second region exterior to the electrochemical cell and a second state in which the cathode degassing port is closed, such that the cathode is fluidically isolated from the second region.
2. The electrochemical cell of claim 1 , further comprising:
an anode seal and a cathode seal, wherein the selectively permeable membrane is sealed between the anode seal and the cathode seal.
3. The electrochemical cell of claim 2 , wherein the anode degassing port is defined by a channel disposed in the anode seal.
4. The electrochemical cell of claim 2 , wherein the cathode degassing port is defined by a channel disposed in the cathode seal.
5. The electrochemical cell of claim 2 , wherein the anode seal provides support for an edge of the anode material.
6. The electrochemical cell of claim 2 , wherein the cathode seal provides support for an edge of the cathode material.
7. The electrochemical cell of claim 2 , wherein the anode seal is bonded to the anode current collector.
8. The electrochemical cell of claim 7 , wherein the anode seal is bonded to the anode current collector via at least one of heat sealing, vacuum sealing, lamination, adhesive bonding, and mechanical fastening.
9. The electrochemical cell of claim 2 , wherein the cathode seal is bonded to the cathode current collector.
10. The electrochemical cell of claim 9 , wherein the cathode seal is bonded to the cathode current collector via at least one of heat sealing, vacuum sealing, lamination, adhesive bonding, and mechanical fastening.
11. The electrochemical cell of claim 2 , wherein the edges of the selectively permeable membrane are bonded to the anode seal and the cathode seal via at least one of heat sealing, vacuum sealing, lamination, adhesive bonding, and mechanical fastening.
12. The electrochemical cell of claim 1 , wherein the anode degassing port has a circular cross section.
13. The electrochemical cell of claim 1 , wherein the cathode degassing port has a circular cross section.
14. The electrochemical cell of claim 1 , wherein the anode, the cathode, the selectively permeable membrane, the anode degassing port, and the cathode degassing port are disposed in a pouch.
15. The electrochemical cell of claim 14 , wherein the anode degassing port and the cathode degassing port are separated from the rest of the pouch via a pressure regulating membrane.
16. The electrochemical cell of claim 1 , wherein the cathode degassing port expels at least about 20% of the gas generated in the cathode.
17. The electrochemical cell of claim 1 , wherein the anode degassing port expels at least about 20% of the gas generated in the anode.
18. An electrochemical cell stack, comprising:
a plurality of electrochemical cells, each electrochemical cell comprising an anode, a cathode fluidically isolated from the anode via a selectively permeable membrane, an anode degassing port fluidically coupled to the anode and configured to allow the flow of gas only in a direction from the anode to a first region exterior to the electrochemical cell, a cathode degassing port fluidically coupled to the cathode and fluidically isolated from the anode degassing port and configured to allow the flow of gas only in a direction from the cathode to a second region exterior to the electrochemical cell, an anode tab electronically coupled to the anode, and a cathode tab electronically coupled to the cathode;
an anode busbar electronically coupled to each of the anode tabs; and
a cathode busbar electronically coupled to each of the cathode tabs.
19. The electrochemical cell stack of claim 18 , wherein each electrochemical cell further comprises an anode seal and a cathode seal, wherein the selectively permeable membrane is sealed between the anode seal and the cathode seal.
20. The electrochemical cell stack of claim 19 , wherein each anode degassing port is defined by a channel disposed in the anode seal.
21. The electrochemical cell stack of claim 20 , wherein each cathode degassing port is defined by a channel disposed in the cathode seal.
22. The electrochemical cell stack of claim 18 , wherein the anode busbar is on a first side of the electrochemical cell stack, and the cathode busbar is on a second side of the electrochemical cell stack, the second side opposite the first side.
23. The electrochemical cell stack of claim 18 , wherein the anode busbar is on the same side of the electrochemical cell stack as the cathode busbar.