Low cost bipolar current collector-separator for electrochemical cells
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United States of America Patent
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-
Jul 29, 1980
Grant Date -
N/A
app pub date -
Jan 2, 1979
filing date -
Jan 2, 1979
priority date (Note) -
Expired
status (Latency Note)
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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.
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