Battery plates with self-passivating iron cores and mixed acid e

Details Battery plates with self-passivating iron cores and mixed acid e Battery plates with self-passivating iron cores and mixed acid e

1994-07-29

1997-07-08

Nuzzolillo, M.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

429245, 429194, 429188, H01M 210

Patent

active

056459599

ABSTRACT:
The Battery Plates with Self-Passivating Iron Cores and Mixed Acid Electrolyte disclosed and claimed in this patent application solve the problems encountered by previous attempts to construct practical bipolar plates for lead-acid batteries. One of the preferred embodiments of the present invention comprises a novel combination of a self-repairing substrate (12) surrounded by a lead coating (16a & 16b) resulting in a bipolar plate (10A) which is nearly three times lighter than its pure lead counterpart. Since this innovative plate incorporates a core or substrate (12) that is self-passivating under the electrical potential and highly acidic conditions found in the lead-acid battery, any pinholes, gaps, or flaws in the lead coatings (16a & 16b) are naturally resealed. Another preferred embodiment utilizes a coating of a semi-conducting metal oxide (18), such as fluorine-doped stannic oxide, on the positive side of the bipolar plate (10B) instead of lead, which further reduces the weight. The self-passivation of the central core is enhanced by combining phosphoric or boric acid with the sulfuric acid electrolyte used in the battery.

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