Separator for electrochemical cell with overcharge protection and method of making same
AssigneeFreya Energy, Inc.
InventorsAndrew James Manning, Ethirajulu Dayalan
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Abstract
A separator for a rechargeable electrochemical cell that has a conductive first layer and a non-conductive second layer. The non-conductive second layer and the conductive first layer are adhered to one another, wherein the separator has a higher threshold voltage than a threshold voltage of the conductive first layer alone. At a predetermined voltage, the separator becomes conductive and stops further ionic transfers.
Claims19
A separator for use in a rechargeable electrochemical cell comprising:
- a conductive first layer;
- a non-conductive second layer, the non-conductive second layer and the conductive first layer are adhered to one another, wherein the separator has a higher threshold voltage than a threshold voltage of the conductive first layer alone.
A separator for use in a rechargeable electrochemical cell comprising:
- a conductive first layer made of polymeric material;
- and
- a non-conductive second layer, the non-conductive second layer made of a polymeric material in a polyolefin resin, the first layer and the second layer adhered.
A method of making a separator for use in an electrochemical cell comprising the steps of:
- making a first solution for a non-conductive first layer of the separator, the solution containing at least a polyolefin resin;
- drawing out the first layer;
- drying the first layer;
- making a second solution for a conductive second layer of the separator, the solution containing at least one conductive polymeric material and at least one polyolefin resin;
- drawing out the second layer on top of the first layer;
- and
- drying the second layer on top of the first layer.
Dependencies are inferred from the claim text.