Activated rechargeable hydrogen storage electrode and method

Details Activated rechargeable hydrogen storage electrode and method Activated rechargeable hydrogen storage electrode and method

1986-12-29

1987-12-29

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

Fluid active material or two-fluid electrolyte combination...

429209, 429218, 296231, 420900, 423644, H01M 436, H01M 1044

Patent

active

047160888

ABSTRACT:
Activated rechargeable hydrogen storage electrodes that are especially suitable for sealed, starved electrochemical cells and methods for making them are provided. The activated electrode includes a body of hydrogen storage active material that is composed of an agglomeration of particles of active hydrogen storage material. The body contains a residual amount of hydrogen and may have a modified surface, the residual amount of hydrogen generally being equivalent to a potential of about -0.7 volts versus a Hg/HgO reference electrode when discharged at a rate of about 5 mA/gram to 25 mA/gram of active material.
The method provided for activating a rechargeable hydrogen storage negative electrode includes contacting the electrode with alkaline material for sufficient time at sufficient temperature to alter the surface oxides on the electrode present on the electrodes after fabrication to increase the charge acceptance and electrochemical hydrogen transfer rate and discharging at least a portion of the initial charge present in the electrode. The surface oxides may be treated by several methods, such as by contact with alkaline material or electrochemically.

REFERENCES:
patent: 3669745 (1972-06-01), Beccu
patent: 3824131 (1974-07-01), Beccu
patent: 4112199 (1978-09-01), Dunlop et al.
patent: 4160014 (1979-07-01), Gamo et al.
patent: 4551400 (1985-11-01), Sapru et al.

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