Electrochemical energy storage devices
Provided herein are energy storage devices. In some cases, the energy storage devices are capable of being transported on a vehicle and storing a large amount of energy. An energy storage device is provided comprising at least one liquid metal electrode, an energy storage capacity of at least about 1 MWh and a response time less than or equal to about 100 milliseconds (ms).
1. An electrochemical energy storage device, comprising:
(a) a container comprising an electrically conductive housing, a reactive material, and an electrolyte comprising a salt, wherein said salt is in a liquid or a gas state during operation of said electrochemical energy storage device; and
(b) a sealing unit configured to seal said container from an environment external to said container, wherein said sealing unit comprises a ceramic material exposed to said reactive material or said salt, wherein said ceramic material comprises an element capable of forming a compound with said reactive material, and wherein said sealing unit provides a helium leak rate of no more than about 1×10 −6 atmosphere-cubic centimeters per second (atm-cc/s) at a temperature of at least about 200° C.
2. The electrochemical energy storage device of claim 1 , further comprising a conductor in electrical contact with said reactive material, wherein said conductor protrudes through an aperture in said electrically conductive housing.
3. The electrochemical energy storage device of claim 2 , wherein said conductor is adjacent to said sealing unit, and wherein said sealing unit electrically isolates said conductor from said container.
4. The electrochemical energy storage device of claim 1 , wherein said sealing unit further comprises a metal collar disposed adjacent to said ceramic material.
5. The electrochemical energy storage device of claim 4 , wherein said metal collar is formed from a ferrous alloy or stainless steel.
6. The electrochemical energy storage device of claim 4 , wherein said sealing unit further comprises a braze disposed between said ceramic material and at least one of said container and said metal collar.
7. The electrochemical energy storage device of claim 6 , wherein said braze comprises iron, nickel, titanium, chromium, zirconium, phosphorus, boron, carbon, silicon, calcium, beryllium, magnesium, vanadium, copper, or any combination thereof.
8. The electrochemical energy storage device of claim 6 , wherein said braze comprises titanium.
9. The electrochemical energy storage device of claim 1 , wherein said ceramic material comprises aluminum nitride, beryllium nitride, boron nitride, calcium nitride, silicon nitride, aluminum oxide, beryllium oxide, calcium oxide, cerium oxide, erbium oxide, lanthanum oxide, magnesium oxide, neodymium oxide, samarium oxide, scandium oxide, ytterbium oxide, yttrium oxide, zirconium oxide, yttria partially stabilized zirconia, boron carbide, silicon carbide, titanium carbide, zirconium carbide, titanium diboride, chalcogenides, quartz, glass, or any combination thereof.
10. The electrochemical energy storage device of claim 1 , wherein said ceramic material comprises aluminum nitride.
11. The electrochemical energy storage device of claim 1 , wherein said container comprises a negative electrode and a positive electrode, wherein said electrolyte is disposed between said negative electrode and said positive electrode, and wherein said negative electrode comprises said reactive material.
12. The electrochemical energy storage device of claim 1 , wherein said reactive material comprises one or more alkali metals or one or more alkaline earth metals.
13. The electrochemical energy storage device of claim 1 , wherein said reactive material comprises lithium, sodium, potassium, rubidium, cesium, calcium, magnesium, barium, or any combination thereof.
14. The electrochemical energy storage device of claim 1 , wherein said container is configured to maintain said reactive material at a temperature of about 100° C. to about 700° C. during operation of said electrochemical energy storage device.
15. The electrochemical energy storage device of claim 1 , wherein said electrochemical energy storage device is capable of storing at least about 50 watt-hours of energy.
16. The electrochemical energy storage device of claim 1 , wherein said sealing unit is configured to be chemically resistant to calcium vapor at a temperature of at least 350° C.
17. The electrochemical energy storage device of claim 1 , wherein said sealing unit provides said helium leak rate of no more than about 1×10 −6 atm-cc/s when said electrochemical cell has been operated for a period of at least about 1 year.
18. The electrochemical energy storage device of claim 1 , wherein said sealing unit provides said helium leak rate of no more than about 1×10 −6 atm-cc/s when said electrochemical cell has been operated for at least about 350 charge/discharge cycles.
19. The electrochemical energy storage device of claim 1 , wherein said helium leak rate is no more than about 1×10 −7 atm-cc/s at said temperature.
20. The electrochemical energy storage device of claim 1 , wherein said helium leak rate is no more than about 1×10 −8 atm-cc/s at said temperature.
21. The electrochemical energy storage device of claim 1 , wherein said helium leak rate is no more than about 1×10 −9 atm-cc/s at said temperature.