H - Electricity – 01 – M
Patent
H - Electricity
01
M
H01M 10/30 (2006.01) H01M 10/28 (2006.01) H01M 4/78 (2006.01) H01M 4/80 (2006.01) H01M 10/34 (2006.01) H01M 10/52 (2006.01)
Patent
CA 2281371
This invention is directed to fabrication of a rechargeable galvanic element with a positive nickel oxide electrode and a negative zinc electrode containing an alkaline electrolyte and a separator. The cathode consists of a nickel foam structure which is repeatedly filled with a nickel hydroxide rich paste made of a PVA-slurry. Then it is suitably compressed to a sheet or tape of defined thickness, rolled up into one or more layers and inserted into a nickel-plated steel can. In this way the nickel electrode is shaped into a very tight cylindrical cathode. Alternatively the filled foam can be compressed into a multiple of sleeves which are inserted exactly the same, also forming a cylindrical cathode. Such nickel foam based cathodes are exhibiting an exceptionally low resistance and high efficiency leading to a sharp cut-off after the capacity is completely exhausted thereby establishing a cathode limited cell. The anode consists of zinc powder, zinc oxide and a gelling agent, like Carbopol. In rechargeable nickel-zinc cells the anode capacity is chosen as a multiple of the cathode capacity. The separator is preferrably of the cellulosic type. A brass nail located in the center of the cell builds the negative terminal. The cell is characterized by prevention of excessive swelling of the cathode due to the cylindrical design in contrast to plate cells. It is further distinguished by the use of special additives to improve recharging. Recombination catalysts for hydrogen gas which may evolve as corrosion product from mercury-free zinc anodes are applied. The electrolyte is a solution of potassium hydroxide with lithium hydroxide as additive. The rechargeable nickel-zinc cells built according to the invention can be manufactured in all conventional cylindrical sizes (e.g. AAA, AA, C and D), hermetically sealed, and thereby used in all consumer electronic devices.
Hartford Wayne
Kordesch Karl
Taucher-Mautner Waltraud
Energy Ventures Inc. (canada)
Mccarthy Tetrault Llp
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