Method for modifying the electrochemical surface area of a cell

Details Method for modifying the electrochemical surface area of a cell Method for modifying the electrochemical surface area of a cell

1999-07-28

2000-02-29

Maples, John S.

Metal working

Method of mechanical manufacture

Electrical device making

429 94, 429249, H01M 216

Patent

active

060304227

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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