Rechargeable Battery with Shutdown Layer
AssigneeFord Global Technologies, LLC
InventorsVenkataramani Anandan, Andrew Robert Drews
Life of this patent
Estimating the term…
Abstract
In at least one embodiment, a battery is provided comprising an anode and cathode, a separator between the anode and cathode, and a shutdown layer between the separator and the anode or cathode. The shutdown layer may include low melting point material and a conductive material within the low melting point material forming a conductive network within the shutdown layer. At a melting point temperature of the low melting point material, the conductive network is reduced such that at least a portion of the shutdown layer is substantially electrically non-conductive. The shutdown layer may be a free-standing layer or may be coated one or both of the electrodes.
Claims20
A battery comprising:
- an anode and cathode;
- a separator between the anode and cathode;
- and
- a shutdown layer between the separator and the anode or cathode and including a wax material and a conductive material within the wax material and forming a conductive network within the shutdown layer, at a wax material melting point temperature, the conductive network is reduced such that at least a portion of the shutdown layer is substantially electrically non-conductive.
A method of forming a shutdown layer for a rechargeable battery, the method comprising:
- preparing a mixture of a wax material and a plurality of conductive particles;
- coating the mixture onto a battery electrode;
- and
- drying the mixture to obtain a dried mixture including a conductive network within the wax material to obtain a shutdown layer in which at a melting point temperature of the wax material, the conductive network is reduced such that at least a portion of the shutdown layer is substantially electrically non-conductive.
A battery comprising:
- an anode;
- a cathode;
- a separator between the anode and cathode;
- and
- a shutdown layer between the separator and the anode or the cathode and consisting essentially of a low melting point (LMP) material and a conductive material distributed throughout the LMP material and forming a conductive network within the shutdown layer;
- and at a melting point temperature of the LMP material, the conductive network is reduced such that at least a portion of the shutdown layer is substantially electrically non-conductive.
Dependencies are inferred from the claim text.