WE CLAIM:
1. A lithium-ion capacitor (200) comprising:
an anode (202) fabricated through deposition of nitrogen-doped reduced graphene
oxide (N-rGO) lithiated by long alkyl chain-Lithium (Li), over a first current collector
(212);
a cathode (204) fabricated through deposition of activated carbon (210) over a
second current collector (214); and
an electrolyte (206) for allowing ion exchange between the anode (202) and the
cathode (204).
2. The lithium-ion capacitor (200) as claimed in claim 1, wherein the N-rGO is synthesized
from graphene oxide (GO) by simultaneously performing reduction and nitrogen doping
operations at a high temperature in presence of a nitrogen source.
3. The lithium-ion capacitor (200) as claimed in claim 1, wherein lithiation of the N-rGO is
optimized by changing a volume of a solution of the long alkyl chain-Li.
4. The lithium-ion capacitor (200) as claimed in claim 3, wherein the long alkyl chain-Li is
n-butyl Li.
5. The lithium-ion capacitor (200) as claim in claim 1, wherein a porosity of the N-rGO is
increased by one or more of steam activation or chemical activation.
6. The lithium-ion capacitor (200) as claimed in claim 1, wherein the first current collector
(212) is made of copper and the second current collector (214) is made of aluminium.
7. A method of fabrication of an anode (202) for use in a lithium-ion capacitor (200), the
method comprising:
preparing nitrogen-doped reduced graphene oxide (N-rGO) from graphene oxide
(GO) by simultaneously performing reduction and nitrogen-doping operations at a high
temperature in presence of a nitrogen source;
performing lithiation of the N-rGO, to obtain lithiated N-rGO (208), by:
dispersing the N-rGO in an organic solvent; and
12
gradually adding and mixing a solution of long alkyl chain-Lithium (Li) into
the N-rGO dispersed in the organic solvent;
preparing a precipitate by heating the lithiated N-rGO (208) at a predefined
temperature; and
coating the precipitate on a first current collector (212), thereby obtaining the anode
(202).
8. The method as claimed in claim 7, wherein the lithiation of the N-rGO is optimized by
changing a volume of the solution of the long alkyl chain-Li.
9. The method as claimed in claim 8, wherein the long alkyl chain-Li is n-butyl Li.
10. The method as claimed in claim 7, wherein a porosity of the N-rGO is increased by one
or more of steam activation and chemical activation.
11. The method as claimed in claim 7, wherein the lithiation of the N-rGO is performed in
an inert atmosphere.
12. The method as claimed in claim 7, wherein the precipitate is coated on the first current
collector (212) at a relative humidity (RH) of less than or equal to 10.
13. The method as claimed in claim 7, wherein the organic solvent is Hexane.
14. The method as claimed in claim 7, wherein the first current collector (212) is made of
copper.
15. The method as claimed in claim 7, wherein the predefined temperature ranges from 45
0C to 55 0C.