Sodium-halogen secondary cell
AssigneeCeramatec, Inc.
InventorsSai Bhavaraju, Mathew Robins, Alexis Eccleston
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Abstract
A sodium-halogen secondary cell that includes a negative electrode compartment housing a negative, sodium-based electrode and a positive electrode compartment housing a current collector disposed in a liquid positive electrode solution. The liquid positive electrode solution includes a halogen and/or a halide. The cell includes a sodium ion conductive electrolyte membrane that separates the negative electrode from the liquid positive electrode solution. Although in some cases, the negative sodium-based electrode is molten during cell operation, in other cases, the negative electrode includes a sodium electrode or a sodium intercalation carbon electrode that is solid during operation.
Claims15
A sodium-halogen secondary cell, comprising:
- a negative electrode compartment comprising a negative electrode that comprises sodium, wherein the negative electrode electrochemically oxidizes to release sodium ions during discharge and electrochemically reduces sodium ions to form sodium metal during recharge;
- a positive electrode compartment comprising a current collector disposed in a liquid positive electrode solution that comprises at least one of a halogen and a halide, wherein the secondary cell is configured to perform one or more reactions in the positive electrode compartment selected from the following reactions:
- NaX3+2e−3NaX
- 3X2+2Na++2e−2NaX3;
- and
- a sodium ion conductive electrolyte membrane that separates the negative electrode from the liquid positive electrode solution.
Dependencies are inferred from the claim text.