Separator membranes for redox-type electrochemical cells
First Claim
1. In an improved redox electrochemical cell incorporating two chemically-inert electrodes of opposite polarity, at least one aqueous acidic electrolyte, and a separator membrane between the adjacent electrodes, the improvement comprising an anion exchange separator membrane formed by grafting a polyolefin film to the extent of 5-200% with one or more vinyl substituted monomers via gamma irradiation and subsequently impregnating the grafted film with iron by exposing said film to an aqueous solution of ferric ion.
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Abstract
This disclosure is directed to improved redox type electrochemical cells, preferably those of the iron (+3)/iron (+2) or chromium (+3)/iron (+2) electrolyte variety, incorporating polymeric, ion-exchange separator membranes produced by radiation grafting techniques.
96 Citations
10 Claims
- 1. In an improved redox electrochemical cell incorporating two chemically-inert electrodes of opposite polarity, at least one aqueous acidic electrolyte, and a separator membrane between the adjacent electrodes, the improvement comprising an anion exchange separator membrane formed by grafting a polyolefin film to the extent of 5-200% with one or more vinyl substituted monomers via gamma irradiation and subsequently impregnating the grafted film with iron by exposing said film to an aqueous solution of ferric ion.
- 2. The redox cell of claim 21 wherein the grafted film is impregnated with iron by boiling the film in water, bathing the boiled film in an aqueous solution containing ferric ion and washing the film with water.
- 7. In an improved redox electrochemical cell incorporating two chemically-inert electrodes of opposite polarity, at least one aqueous acidic electrolyte, and a separator membrane between the adjacent electrodes, the improvement comprising an anion exchange separator membrane formed by grafting a polyolefin film to the extent of 5-200% with two monomers selected from the group consisting of 2-vinyl-pyridine, 4-vinyl-pyridine, 2-N,N-dimethyl-aminoethyl methacrylate, 2-vinylbenzyl chloride, 4-vinylbenzyl-chloride, acrylic acid, methacrylic acid and 2-N,N-dimethyl-aminoethyl acrylate.
Specification