Sealing glass composition, method and article
View Patent ↗A sealing glass for an energy storage device is provided. The sealing glass includes silicon dioxide, boron oxide, aluminum oxide, sodium oxide and zirconium oxide. Methods for preparing the sealing glass and the energy storage device incorporating the sealing glass are also provided.
1. An energy storage device, comprising:
an electrochemical cell incorporating a sealing glass consisting of:
silicon dioxide that is present in an amount in a range of from about 30 weight percent to about 70 weight percent;
boron oxide that is present in an amount in a range of from about 10 weight percent to about 40 weight percent;
aluminum oxide that is present in an amount in a range of from about 5 weight percent to about 30 weight percent;
sodium oxide that is present in an amount in a range of from about 4 weight percent to about 16 weight percent;
zirconium oxide that is present in an amount in a range of from about 0.1 weight percent to about 10 weight percent; and
up to about 10 weight percent of one or more alkaline earth oxides.
2. The energy storage device of claim 1 wherein the electrochemical cell contains a first battery component and a second battery component.
3. The energy storage device of claim 2 wherein the first battery component is an electrolyte tube, and the second battery component is a collar.
4. The energy storage device as defined in claim 3 , wherein the electrolyte tube comprises beta-alumina and the collar comprises alpha-alumina.
5. The energy storage device of claim 1 wherein the sealing glass consists of:
from about 40 weight percent to about 70 weight percent silicon dioxide,
from about 10 weight percent to about 30 weight percent boron oxide,
from about 5 weight percent to about 20 weight percent aluminum oxide,
from about 4 weight percent to about 15 weight percent sodium oxide,
from about 1 weight percent to about 10 weight percent zirconium oxide, and
up to about 10 weight percent of one or more alkaline earth oxides.
6. The energy storage device of claim 5 wherein the sealing glass consists of:
from about 40 weight percent to about 65 weight percent silicon dioxide,
from about 15 weight percent to about 25 weight percent boron oxide,
from about 5 weight percent to about 20 weight percent aluminum oxide,
from about 6 weight percent to about 15 weight percent sodium oxide,
from about 1 weight percent to about 10 weight percent zirconium oxide, and
up to about 10 weight percent of one or more alkaline earth oxides.
7. The energy storage device of claim 6 wherein the sealing glass consists of:
from about 40 weight percent to about 50 weight percent silicon dioxide,
from about 20 weight percent to about 30 weight percent boron oxide,
from about 10 weight percent to about 20 weight percent aluminum oxide,
from about 10 weight percent to about 15 weight percent sodium oxide,
from about 0.1 weight percent to about 5 weight percent zirconium oxide, and
up to about 8 weight percent of one or more alkaline earth oxides.
8. The energy storage device of claim 1 , wherein the alkaline earth oxide is barium oxide.
9. The energy storage device of claim 1 , wherein the alkaline earth oxide is calcium oxide.
10. The energy storage device of claim 1 , wherein the alkaline earth oxide is strontium oxide.
11. The energy storage device of claim 1 , wherein the sealing glass has a coefficient of thermal expansion at a temperature in a range of from about 20 degrees Celsius to about 350 degrees Celsius of from about 5.0 ppm/° C. to about 8.0 ppm/° C.
12. The energy storage device of claim 1 , wherein the sealing glass has a glass transition temperature of at least about 500 degrees Celsius.
13. The energy storage device of claim 1 , wherein the sealing glass has a glass transition temperature in a range of from about 500 degrees Celsius to about 700 degrees Celsius.
14. A method, comprising:
blending silicon dioxide, boron oxide, aluminum oxide, sodium oxide, zirconium oxide and, optionally, one or more alkaline earth oxides to form a blend consisting of silicon dioxide in an amount in a range of from about 30 weight percent to about 70 weight percent, boron oxide in an amount in a range of from about 10 weight percent to about 40 weight percent, aluminum oxide in an amount in a range of from about 5 weight percent to about 30 weight percent, sodium oxide that is present in a range of from about 4 weight percent to about 16 weight percent, zirconium oxide that is present in a range of from about 0.1 weight percent to about 10 weight percent and up to about 10 weight percent of one or more alkaline earth oxides; and
forming a glass seal from the blend to join a first battery component to a second battery component.
15. The method of claim 14 , further comprising selecting ingredient amounts for the blend such that the silicon dioxide is present in an amount in a range of from about 40 weight percent to about 70 weight percent, boron oxide is present in an amount in a range of from about 10 weight percent to about 30 weight percent, aluminum oxide is present in an amount in a range of from about 5 weight percent to about 20 weight percent, sodium oxide is present in an amount in a range of from about 4 weight percent to about 15 weight percent, zirconium oxide is present in an amount in a range of from about 1 weight percent to about 10 weight percent and up to about 10 weight percent of one or more alkaline earth oxides.
16. The method of claim 15 , further comprising selecting the alkaline earth oxide from the group consisting of calcium oxide, strontium oxide and barium oxide.
17. The method of claim 16 , further comprising selecting an additional alkaline earth oxide from the group consisting of calcium oxide, strontium oxide and barium oxide, and adding the additional alkaline earth oxide to the blend.
18. The method of claim 14 , wherein blending comprises melt blending.
19. The method of claim 18 , wherein melt blending comprises selecting a temperature to be in a range from about 1300 degrees Celsius to about 1700 degrees Celsius.
20. The method of claim 15 , wherein selecting the ingredient amounts comprises matching the thermal expansion coefficient of the glass seal to one or both of the first battery component and the second battery component.
21. The method of claim 14 , wherein the first battery component is an electrically insulating collar, and the second battery component is an electrically-insulative and ion-conductive electrolyte tube, and the glass seal is a sodium resistant and halide resistant barrier.