Oxygen ion conductors for electrochemical cells
First Claim
1. Solid oxygen ion conducting electrolytes for electrochemical cells, which operate at elevated temperatures, said solid oxygen ion conducting electrolytes consisting of least one member of the group of host oxides, comprising calcium oxide (CaO), and magnesium oxide (NgO), wherein members of said group of host oxides are present in admixtures with at least one metal fluoride from the group consisting of lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF), magnesium fluoride (MgF2), calcium fluoride (CaF2), and strontium fluoride (SrF2), said mixtures of host oxides and said metal fluorides, being homogenized and sintered at high temperatures in containments and in a cover-gas atmosphere, thereby becoming solid oxygen ion conducting electrolytes, and including said host oxides in said solid oxygen ion conducting electrolytes in a concentration range of between 60.0 mol % and 99.9 mol %, and wherein the concentration range of said metal fluorides in said solid oxygen ion conducting electrolytes being in the range between 0.1 mol % and 40.0 mol %.
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Abstract
In solid oxygen ion conducting electrolytes for electrochemical cells based on magnesium oxide and calcium oxide, obtained by the addition of metal fluorides selected from elements in the groups of alkali metals and earth alkali metals to the host oxides of magnesium and calcium, conductivity values are obtained, which are comparable with those of stabilized zirconia, but the magnesium oxide and calcium oxide based oxygen ion conducting electrolytes have a superior thermodynamic stability and, therefore, can operate at much lower oxygen concentrations in comparison with other oxygen ion conducting electrolytes and without becoming noticeably electronically conductive.
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Citations
20 Claims
- 1. Solid oxygen ion conducting electrolytes for electrochemical cells, which operate at elevated temperatures, said solid oxygen ion conducting electrolytes consisting of least one member of the group of host oxides, comprising calcium oxide (CaO), and magnesium oxide (NgO), wherein members of said group of host oxides are present in admixtures with at least one metal fluoride from the group consisting of lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF), magnesium fluoride (MgF2), calcium fluoride (CaF2), and strontium fluoride (SrF2), said mixtures of host oxides and said metal fluorides, being homogenized and sintered at high temperatures in containments and in a cover-gas atmosphere, thereby becoming solid oxygen ion conducting electrolytes, and including said host oxides in said solid oxygen ion conducting electrolytes in a concentration range of between 60.0 mol % and 99.9 mol %, and wherein the concentration range of said metal fluorides in said solid oxygen ion conducting electrolytes being in the range between 0.1 mol % and 40.0 mol %.
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20. Electrical heater elements made of oxygen ion conducting materials composed of host oxides and metal fluoride additives, where said host oxides are at least one of the group of calcium oxide (CaO), and magnesium oxide (MgO), and said metal fluorides additives are at least one of the group of lithium fluoride, sodium fluoride, potassium fluoride, magnesium fluoride, calcium fluoride, and strontium fluoride, and where said host oxide concentration in said heater elements lies in the range of 60.0 mol % to 99.9 mol %, and whereby said heater elements being in electrical contact with electronically conducting electrodes.
Specification