Claims
- 1. An electrochemical cell having a solid electrolyte of high conductivity comprising a mixture of at least two salts of the composition M.sub.2 SO.sub.4 --Me.sub.x SO.sub.4 where M is an ion of one or more alkali metals, Ag or a mixture thereof, Me is an ion of a divalent metal or Ag and x is 1 when Me is divalent and 2 when Me is Ag, with the proviso that at least when Me is Ag, the mixture further contains a salt of the composition Ma.sub.x SO.sub.4 or Ma Y.sub.z where Ma is an ion of an alkali metal, Ag or a divalent metal other than M, Y is a halogen, x is 1 when Ma is divalent and 2 when Ma is an alkali metal or silver and z is 1 when Ma is an alkali metal or silver and 2 when Ma is divalent, and wherein the alkali metal salt is present in the electrolyte salt mixture in an amount of at least 50 mole percent.
- 2. A cell as in claim 1 wherein the divalent metal ion of the solid electrolyte is Ca, Mg, or Zn.
- 3. A cell as in claim 1 wherein the divalent metal ion of the solid electrolyte is Ca, Mg or Zn.
- 4. A cell as in claim 1 wherein the solid electrolyte is a ternary mixture in which (SO.sub.4) is the predominant anion and silver halide is provided to stabilize the transformation point of the sulfate structure.
- 5. An electrochemical cell as in claim 1 having a solid electrolyte of the composition Li--Ag--X--(SO.sub.4), wherein X is Cl, Br, or I, or mixtures thereof.
- 6. A cell as in claim 5 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --Ag.sub.2 SO.sub.4 --AgCl.
- 7. A cell as in claim 5 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --Ag.sub.2 SO.sub.4 --AgBr.
- 8. A cell as in claim 5 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --Ag.sub.2 SO.sub.4 --AgI.
- 9. A cell as in claim 1 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --ZnSO.sub.4 --LiCl.
- 10. A cell as in claim 1 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --CaSO.sub.4.
- 11. A cell as in claim 1 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --MgSO.sub.4.
- 12. A cell as in claim 1 wherein the solid electrolyte has the composition Na.sub.2 SO.sub.4 --ZnSO.sub.4.
- 13. A cell as in claim 1 wherein the solid electrolyte has the composition K.sub.2 SO.sub.4 --ZnSO.sub.4.
- 14. A cell as in claim 1 wherein the solid electrolyte has the composition Ag.sub.2 SO.sub.4 --MgSO.sub.4.
- 15. A cell as in claim 1 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --Na.sub.2 SO.sub.4 --MgSO.sub.4.
- 16. A cell as in claim 1 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --Ag.sub.2 SO.sub.4 --MgSO.sub.4.
- 17. A cell as in claim 1 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --Ag.sub.2 SO.sub.4 --Na.sub.2 SO.sub.4.
- 18. A cell as in claim 1 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --Ag.sub.2 SO.sub.4 --ZnSO.sub.4.
- 19. A cell as in claim 1 wherein the solid electrolyte has the composition Li.sub.2 SO.sub.4 --Na.sub.2 SO.sub.4 --ZnSO.sub.4.
- 20. An electrochemical cell as in claim 1 wherein the solid electrolyte contains from 5 to 92.5 mole percent of at least one alkali metal sulfate and from 7.5 to 36 mole percent divalent metal sulfate.
- 21. An electrochemical cell as in claim 20 wherein from 15 to 20 mole percent of Ag.sub.2 SO.sub.4 is substituted for a corresponding amount of alkali metal sulfate.
- 22. An electrochemical cell as in claim 1 wherein the solid electrolyte contains from 5 to 92.5 mole percent of at least one alkali metal sulfate, 7.5 to 36 mole percent divalent metal sulfate, and 15 to 20 mole percent silver halide.
- 23. An electrochemical cell as in claim 22 wherein from 15 to 20 mole percent of Ag.sub.2 SO.sub.4 is substituted for a corresponding amount of alkali metal sulfate.
- 24. A cell as in claim 1 wherein the proportions of salts in said mixture of salts is such that said mixture of salts has a transformation point in the range of from about room temperature to 572.degree. C.
- 25. A method of producing an electrochemical cell having a solid electrolyte of high conductivity which comprises preparing a mixture of at least two salts of the composition M.sub.2 SO.sub.4 --Me.sub.x SO.sub.4 where m is an ion of one or more alkali metals, Ag or a mixture thereof, Me is an ion of a divalent metal or Ag and x is 1 when Me is divalent and 2 when Me is Ag, with the proviso that at least when Me is Ag, the mixture further contains a salt of the composition Ma.sub.x SO.sub.4 or Ma Y.sub.z where Ma is an ion of an alkali metal, Ag or a divalent metal other than M, Y is a halogen, x is 1 when Ma is divalent and 2 when Ma is an alkali metal or silver and z is 1 when Ma is an alkali metal or silver and 2 when Ma is divalent, and wherein the alkali metal salt is present in the electrolyte salt mixture in an amount of at least 50 mole persent; converting said mixture into a solid mass; and attaching oppositely-active electrochemical electrodes to said solid mass.
- 26. A method as in claim 25 wherein the mixture of salts is heated to a temperature above the transition point and then cooled rapidly to produce the solid electrolyte.
- 27. A method as in claim 26 wherein the mixture of salts is first pressed into a tablet.
- 28. A method as in claim 25 wherein the mixture of salts is compressed at room temperature into a solid mass to produce a solid electrolyte of high conductivity.
Parent Case Info
This is a continuation of application Ser. No. 730,448 filed Oct. 7, 1976 and Ser. No. 590,116 filed June 25, 1975 both now abandoned, which is a continuation-in-part of 466,508 filed May 2, 1974 now abandoned.
US Referenced Citations (4)
Related Publications (1)
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Number |
Date |
Country |
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590116 |
Jun 1975 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
730448 |
Oct 1976 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
466508 |
May 1974 |
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