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US 4,070,527 AGranted
Efficient sodium/sulfur battery
AssigneeElectric Power Research Institute, Inc.
InventorsRandall N. King, Stephan P. Mitoff, Manfred W. Breiter
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AssigneeElectric Power Research Institute, Inc.
InventorsRandall N. King, Stephan P. Mitoff, Manfred W. Breiter
Estimating the term…
Improved sodium-sulfur batteries are provided by enhancing the utilization of active positive-electrode material. In sodium-sulfur batteries, employing a liquid sodium electrode separated from a liquid sulfur electrode by a solid .beta.-alumina electrolyte separator, where the sulfur is impregnated in an electronically conducting matrix such as porous carbon, enhanced utilization of active electrode material is achieved during the charging-discharging cycling by enhancing the electronic resistivity adjacent the .beta.-alumina in the sulfur electrode. This can be achieved in a variety of ways, particularly employing porous carbon of higher resistivity adjacent the .beta.-alumina as compared to the porous carbon distant from the .beta.-alumina.
In a sodium-sulfur solid-electrolyte battery having a sulfur electrode, wherein substantially all of the sulfur is impregnated in an electronically conducting matrix as the sulfur electrode and a solid-electrolyte, wherein said sulfur electrode is adjacent to said solid electrolyte, the improvement in combination therewith which comprises:
In a sodium-sulfur .beta.-alumina-solid-electrolyte separator battery having a sulfur electrode, wherein the sulfur is impregnated in porous carbon to form a sulfur electrode in electrical contact with a metal collector, and a .beta.-alumina-solid-electrolyte, with said sulfur electrode adjacent to said solid-electrolyte the improvement in continuation therewith which comprises:
Dependencies are inferred from the claim text.