Method of making electrodes for bipolar electrochemical battery
AssigneeElectro Energy, Inc.
InventorMartin Klein
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Abstract
The subject invention relates to electrode structures that are adaptable for primary and electrically rechargeable electrochemical wafer cells. A flat wafer cell is disclosed that includes conductive, carbon-filled polymeric outer layers that serve as electrode contacts and as a means of containment of the cell. Multi-cell, higher voltage batteries may be constructed by stacking individual cells. Specially formulated electrodes and processing techniques that are compatible with the wafer cell construction are disclosed for a nickel-metal hydride battery system. The cell design and electrode formulations provide for individual operation of a vented or low pressure sealed cell and/or for operation of these cells in a stacked array in an outer battery housing.
Claims9
A method of making an electrode comprising:
- dry mixing a combination of an electrochemically active material and polytetrafluoroethylene particles in a blending mill to form a mixture;
- dry rolling said mixture into a thin layer;
- dry kneading said thin layer by sequentially folding and rolling said thin layer such that said polytetrafluoroethylene particles form an interconnected network in which said electrochemically active material is embedded;
- calendaring said folded and rolled thin layer to form a substantially flat porous sheet;
- and
- cutting a substantially flat electrode from said porous sheet.
Dependencies are inferred from the claim text.