Charge storage device

1. A charge storage device comprising:

a first electrode;

a second electrode being opposed to and spaced apart from the first electrode;

a porous separator disposed between the electrodes;

a sealed package for containing the electrodes, the separator and an electrolyte in which the electrodes are immersed; and

a first terminal and a second terminal being electrically connected to the first electrode and the second electrode respectively and both extending from the package to allow external electrical connection to the respective electrodes, wherein the gravimetric FOM of the device is greater than about 2.1 Watts/gram.

2. A device according to claim 1 including a gravimetric FOM in one of the following ranges:

about 2.5 Watts/gram to 3 Watts/gram; or

about 3 Watts/gram to 3.5 Watts/gram; or

about 3.5 Watts/gram to 5 Watts/gram; or

greater than about 5 Watts/gram.

3. A device according to claim 1 wherein the first electrode and the second electrode form a capacitive cell and the device includes a plurality of like cells disposed within the package, each cell being electrically connected in parallel with at least one other cell in the package.

4. A device according to claim 1 wherein the first electrode and the second electrode form a capacitive cell and the device includes a plurality of like cells disposed within the package, each cell being electrically connected in series with at least one other cell in the package.

5. A device according to claim 1 wherein the first electrode and the second electrode form a capacitive cell and the device includes a plurality of like cells disposed within the package, each cell being electrically connected with at least one other cell in the package, wherein the connects are a combination of parallel and series connects.

6. A device according to claim 1 wherein the first electrode and the second electrode include a first carbon coating and a second carbon coating respectively wherein the surface area of carbon used in the coatings is greater than 20 m 2 /gram.

7. A device according to claim 1 wherein the first electrode includes a first substrate and a first carbon layer supported by the first substrate, and the second electrode includes a second substrate and a second carbon layer supported by the second substrate, wherein the first and second carbon layers are opposed and includes a surface area of at least 400 m 2 /gram and the gravimetric FOM of the device is greater than about 1 Watts/gram.

8. A device according to claim 7 wherein the surface area of the carbon layers are at least 1200 m 2 /gram.

9. A device according to claim 8 wherein at least one of the carbon layers contains more than one type of carbon.

10. A device according to claim 9 wherein the carbon layers are a mixture of particles of high surface area carbon and highly conductive carbon in a ratio of about 2.5:1 combined with a suspension of carboxy methyl cellulose (CMC).

11. A device according to claim 1 wherein the maximum operating voltage of the device is less than about 4 Volts.

12. A device according to claim 11 wherein the maximum operating voltage of the device is less than about 3.5 Volts.

13. A device according to claim 12 wherein the maximum operating voltage of the device is less than about 3 Volts.

14. A device according to claim 1 wherein the response time (T 0 ) of the device is less than about 0.09 seconds.

15. A device according to claim 14 wherein the response time (T 0 ) of the device is less than about 10 −2 seconds.

16. A device according to claim 15 wherein the response time (T 0 ) of the device is less than about 10 −3 seconds.

17. A device according to claim 16 wherein the response time (T 0 ) of the device is less than about 10 −4 seconds.

18. A device according to claim 17 wherein the response time (T 0 ) of the device is less than about 5×10 −5 seconds.