Sodium ion conducting glasses and batteries embodying glasses
AssigneeCorning Glass Works
InventorAndrew Herczog
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Abstract
Sodium ion conducting glasses are disclosed that have a resistivity not over 10.sup.5 ohm cm. at 300.degree., are resistant to corrosive attack by liquid sodium, resist devitrification, are resistant to moisture, and are composed essentially of soda, alumina, silica, and boric oxide. The glasses are particularly useful in forming membranes to separate electrolytes in electrochemical cells such as the sodium-sulfur battery.
Claims9
A sodium ion conducting glass having a resistivity not over 10.sup.5 ohm-cm at 300.degree. C., being resistant to corrosive attack by liquid sodium and to devitrification, and being composed essentially of, as calculated from the glass batch in cation percent, 32-44% Na, and the remainder essentially a mixture of Si, B and Al wherein the Si content is 10-40% of the total Si+B+Al, the Al is 5-60% of such total, and the B is 15-70%.
A sodium-sulfur battery having a liquid sodium anode, a liquid sulfur-sodium sulfide mixture as a cathode, and a thin glass membrane separating the anode and cathode liquids, the membrane being formed from a sodium ion conducting glass having a resistivity not over 10.sup.5 ohm-cm, being resistant to corrosive attack by liquid sodium and to devitrification, and being composed essentially of, as calculated from the glass batch in cation percent, 32-44% Na, and the remainder essentially a mixture of Si, B and Al wherein the Si content is 10-40% of the total Si+B+Al, the Al is 5-60% of such total, and the B is 15-70%.
In a sodium-sulfur battery, a glass membrane formed from a sodium ion conducting glass having a resistivity not over 10.sup.5 ohm-cm, being resistant to corrosive attack by liquid sodium and to devitrification, and being composed essentially of, as calculated from the glass batch in cation percent, 32-44% Na, and the remainder essentially a mixture of Si, B and Al wherein the Si content is 10-40% of the total Si+B+Al, the Al is 5-60% of such total, and the B is 15-70%.
Dependencies are inferred from the claim text.