Perforated film for modifying the electrochemical surface area o

Details Perforated film for modifying the electrochemical surface area o Perforated film for modifying the electrochemical surface area o

1997-11-03

1999-10-12

Maples, John S.

Chemistry: electrical current producing apparatus, product, and

Plural concentric or single coiled electrode

429105, 429249, 429145, H01M 214

Patent

active

059652918

ABSTRACT:
A perforated fabric for modifying the effective electrochemical surface area of a cell is described. The size and pattern of perforations in the fabric determine the effective electrochemical surface area of the cell. In practice, the modified cell comprises a layer of perforated fabric placed between the anode and the cathode along with a suitable electrolyte absorbent separator material. Electrodes are then assembled into a cell using typical techniques with a spirally-wound configuration being preferred. The present perforated fabric provides for the production of cells with variable effective electrochemical surface areas while using a single manufacturing line. A preferred cell chemistry comprises a fluorinated carbon electrode present in an alkali metal system with the preferred perforated fabric comprising a Fluorpeel fabric, which is a woven fiberglass cloth impregnated with PTFE polymer.

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