Low cost bipolar current collector-separator for electrochemical

Details Low cost bipolar current collector-separator for electrochemical Low cost bipolar current collector-separator for electrochemical

1979-01-02

1980-07-29

Mack, John H.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204129, 204263, 204279, 204290R, 252511, 429 38, 429 39, C25B 904, C25B 1508, H01B 104, H01M 214

Patent

active

042149690

ABSTRACT:
A bipolar current collector-separator for electrochemical cells consists of a molded aggregate of electro-conductive graphite and a thermoplastic fluoropolymer combined in a weight ratio of 2.5:1 to 16:1. The bulk resistivity of such a molded bipolar current collector-separator is less than 4.times.10.sup.-3 ohm inches (.OMEGA. in.). It has excellent corrosion resistance to a variety of feedstocks such as brine, aqueous HCl, etc. and to various electrolysis products such as caustic, chlorine, hydrogen, etc. In one alternative form the anodic side of a current collector-separator for a water electrolyzer is covered by a thin layer of a passivated metallic foil thus protecting the graphite current collector against attack by oxygen.

REFERENCES:
patent: 3134696 (1964-05-01), Douglas et al.
patent: 4057479 (1977-11-01), Campbell
patent: 4061601 (1977-12-01), Clary et al.
patent: 4118294 (1978-10-01), Pellegri
patent: 4124478 (1978-11-01), Tsien et al.
patent: 4135995 (1979-01-01), Welch

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