Alkaline gel electrolyte for electrochemical cells

Details Alkaline gel electrolyte for electrochemical cells Alkaline gel electrolyte for electrochemical cells

1995-08-10

1996-12-17

Bell, Bruce F.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429191, 429194, 429195, 429206, 429207, 429218, 429221, 429229, 429232, 429223, 429247, 429104, 429105, 429107, 252 622, 252500, H01M 614

Patent

active

055852084

ABSTRACT:
An alkaline gel electrolyte for an electrochemical cell is based on a polymeric binder of polyvinyl alcohol or polyvinyl acetate. Potassium hydroxide and/or sodium hydroxide is blended into the polymeric binder or matrix, and the resulting solution is used to cast a film that is useful as a gel electrolyte. The hydroxide in the solution is between about 1% to 25% by weight, and the polymer concentration is between about 0.5% to 10% by weight. The resulting gel electrolyte film contains between 10 to 90% water by weight. A nickel or iron porphine modifier may be added in an amount between about 1 to 1000 parts per million. The alkaline gel electrolyte is useful in combination with asymmetric inorganic electrodes to make electrochemical cells, and can also function as a separator. Improved power density and higher cycle life is achieved with the gel electrolyte.

REFERENCES:
patent: 4307084 (1981-12-01), Drabick et al.
patent: 4500667 (1985-02-01), Polak et al.
patent: 4605603 (1986-08-01), Kanda et al.
patent: 4705545 (1987-11-01), Polak et al.
patent: 4824528 (1989-04-01), Polak et al.
patent: 5030527 (1991-07-01), Carpio et al.

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