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AssigneeSouth African Inventions Development Corporation
InventorsJohan Coetzer, Michael M. Thackeray
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A cathode for an electrochemical cell is disclosed, and a cell including it, together with an active cathode current collector for use in an electrochemical cell and methods of forming such a cathode. The cathode in its discharged state comprises an intermediate refractory hard metal compound of at least one metal selected from: chromium, iron, manganese, cobalt and nickel with at least one non-metal selected from: carbon, boron, nitrogen, silicon and phosphorous. The cathode is halogenated in its charged state. To form the cathode, the intermediate refractory hard metal is formed and then activated to make it capable of reacting electrochemically with halide ions in use in a cell. The active cathode current collector comprises a core of electroconductive material protected by said intermediate refractory hard metal compound as a surface layer thereon, activated to react electrochemically with halide ions in a cell.
A cathode for an electrochemical cell, the cathode comprising as the electrochemically active material an intermediate refractory hard metal compound of at least one metal selected from the group consisting of chromium, manganese, iron, cobalt and nickel, with at least one non-metal selected from the group consisting of carbon, boron, nitrogen, silicon and phosphorus, which has been activated by halogenation.
An electrochemical cell comprising a cathode, a compatible anode and a compatible electrolyte, the cathode comprising as the electrochemically active material an intermediate refractory hard metal compound of at least one metal selected from the group consisting of chromium, manganese, iron, cobalt and nickel, with at least one non-metal selected from the group consisting of carbon, boron, nitrogen, silicon and phosphorus which has been activated by halogenation.
A method of forming a cathode for an electrochemical cell, which includes the steps of forming as the electrochemically active material an intermediate refractory hard metal compound of at least one metal selected from the group consisting of chromium, manganese, iron, cobalt and nickel, with at least one non-metal selected from the group consisting of carbon, boron, nitrogen, silicon and phosphorus, and activating the refractory hard metal compound by halogenation to make it capable of reacting electrochemically during use in a cell.
An active cathode current collector for use with a cathode in an electrochemical cell, the active cathode current collector comprising as the electrochemically active material an intermediate refractory hard metal compound of at least one metal selected from the group consisting of chromium, manganese, iron, cobalt and nickel, with at least one non-metal selected from the group consisting of carbon, boron, nitrogen, silicon and phosphorus, and the cathode current collector being in an activated stage having been activated by halogenation.
An electrochemical cell comprising a cathode, a compatible anode and a compatible electrolyte, the cathode comprising as the electrochemically active material an intermediate refractory hard metal compound of at least one metal selected from the group consisting of chromium, manganese, iron, cobalt and nickel, with at least one non-metal selected from the group consisting of carbon, boron, nitrogen, silicon and phosphorus, in which the cathode is in an unactivated state, and in which the electrolyte is an electrolyte suitable for activating the cathode in situ by halogenation, the electrolyte being adapted to provide a source of suitable halide ions and having an intrinsic electrolysis threshold voltage greater than the threshold voltage of the cathode.
Dependencies are inferred from the claim text.