Carbon fiber reinforced fluorocarbon-graphite bipolar current co

Details Carbon fiber reinforced fluorocarbon-graphite bipolar current co Carbon fiber reinforced fluorocarbon-graphite bipolar current co

1980-04-21

1982-07-13

Edmundson, F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204294, 204286, 429 38, 429210, C25B 1100, C25B 1112

Patent

active

043393225

ABSTRACT:
A bipolar current collector-separator for electrochemical cells consists of a molded aggregate of electro-conductive graphite and a thermoplastic fluoropolymer particles reinforced with carbon fibers to increase the strength and maintain high electrical conductivity. The graphite and the thermoplastic fluoropolymer are combined in weight ratio ranging from 2.5:1 to 16:1. The carbon fibers may constitute from 10 to 80 weight percent of the conductive graphite. The bulk resistivity of such a molded bipolar current collector is less than 4.times.10.sup.-3 ohm inches (.sigma. in.) It has excellent corrosion resistance to a variety of feed stocks such as brine, aqueous HCl, water, etc. and to various electrolysis products, such as caustic, chlorine, hydrogen, etc.
This invention relates to a molded, conductive, fiber reinforced, current collecting-separator structure for electrochemical cells and, more particularly, to one utilizing thermoplastic fluoropolymer resin binders for bonding electroconductive particles into a solid, current collecting-separator structure reinforced by carbon or graphite fibers or fiber structures.

REFERENCES:
patent: 3134696 (1964-05-01), Douglas et al.
patent: 4057479 (1977-11-01), Campbell
patent: 4197178 (1980-04-01), Pellegri et al.
patent: 4214969 (1980-07-01), Lawrance
patent: 4265727 (1981-05-01), Beckley

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