Ceramic materials and seals for high temperature reactive material devices
The disclosure provides seals for devices that operate at elevated temperatures and have reactive metal vapors, such as lithium, sodium or magnesium. In some examples, such devices include energy storage devices that may be used within an electrical power grid or as part of a standalone system. The energy storage devices may be charged from an electricity production source for later discharge, such as when there is a demand for electrical energy consumption.
1. An electrochemical cell, comprising:
a container comprising a conductor aperture, wherein said container is configured to contain a reactive material at a temperature of at least about 200° C.;
a conductor that extends from an environment external to said container through said conductor aperture into said container; and
a sealing unit that couples said container to said conductor to seal said conductor aperture, wherein said sealing unit comprises a ceramic component coupled to said container and said conductor, wherein said ceramic component is configured to be exposed to said reactive material while sealing said conductor aperture, and wherein said ceramic component comprises a grain size that is less than or equal to about 50 micrometers (μm).
2. The electrochemical cell of claim 1 , wherein said grain size is less than or equal to about 10 μm.
3. The electrochemical cell of claim 1 , wherein said ceramic component has a porosity of less than or equal to about 3% by volume.
4. The electrochemical cell of claim 1 , wherein said ceramic component is a ring, and wherein said ring is disposed around said conductor.
5. The electrochemical cell of claim 1 , wherein said ceramic component has one or more beveled edges.
6. The electrochemical cell of claim 1 , wherein said sealing unit further comprises a metal sleeve configured to couple said ceramic component to said container or to said conductor.
7. The electrochemical cell of claim 6 , wherein said metal sleeve comprises a material selected from the group consisting of grade 304 stainless steel, grade 430 stainless steel, 410 stainless steel, zirconium, an iron-nickel alloy, and 18CrCb ferritic stainless steel.
8. The electrochemical cell of claim 6 , wherein said metal sleeve has a thickness of greater than or equal to about 75 μm.
9. The electrochemical cell of claim 8 , wherein said thickness is less than or equal to about 250 μm.
10. The electrochemical cell of claim 6 , wherein said metal sleeve is coupled to said ceramic component, said container, or said conductor by a braze.
11. The electrochemical cell of claim 10 , wherein said braze comprises one or more member selected from the group consisting of silver, aluminum, titanium, nickel, and combinations thereof.
12. The electrochemical cell of claim 11 , wherein said braze comprises silver and less than or equal to about 5% aluminum.
13. The electrochemical cell of claim 11 , wherein said braze comprises titanium and one or more members selected from the group consisting of zirconium, copper, and nickel.
14. The electrochemical cell of claim 1 , wherein said ceramic component comprises aluminum nitride.
15. The electrochemical cell of claim 14 , wherein said ceramic component further comprises less than or equal to about 5% yttrium oxide.
16. The electrochemical cell of claim 1 , wherein said reactive material comprises a molten metal and a molten salt.
17. The electrochemical cell of claim 16 , wherein said molten metal comprises magnesium, calcium, sodium, barium, potassium, lithium, or any combination thereof.
18. The electrochemical cell of claim 1 , wherein said ceramic component is unreactive to said reactive material or vapors of said reactive material.