Description:METHOD OF PREPARING GRAPHENE OXIDE CATHODE FROM USED LI-ION BATTERIES AND AQUEOUS ZINC BATTERY THEREWITH

CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] None.
FIELD OF THE INVENTION
[0002] The present invention generally relates to the lithium-ion battery (LIB) recovery technology field. Particularly the cathode material is synthesized from graphite of End-of-life (EoL) LIB. Further, the present invention relates to a method for the preparation of the said cathode material.
BACKGROUND OF THE RELATED ART
[0003] The exponentially increasing production rates of electric vehicles and smart grids have created a waste stream of spent LIBs. The piling up of battery wastes has aroused a research interest in recycling the battery constituents, thereby preventing environmental pollution. LIBs majorly consist of four parts; anode, cathode, electrolyte (lithium salts dissolved in high-purity organic solvents), and separator, with the cathode and anode materials coated on current collectors such as aluminium or copper f , Claims:We claim:
1. A method (100) for extraction of spent graphite (SG) from end-of-life (EoL) lithium ion battery (LIB), the method comprising:
sonicating (102) spent graphite electrode on copper foil of EoL LIB with de-ionized water (DI) water to retrieve SG from the copper foil;
centrifuging (103) SG with N-methyl 2- pyrrolidone (NMP) thrice followed by a single wash with DI to remove the binder impurities; and
heating SG (104) at a rate of 1-20 K/min under an argon atmosphere with temperature ranging from 773 to 1273 K and subjecting (105) to thermal annealing for a total duration of 1 – 12 hours.

2. A method (200) for the preparation of GO from SG of EoL LIB, the method comprising:
providing (201) SG extracted from EoL LIB;
mixing (202) SG with NaNO3 and H2SO4 continuously in an ice bath condition for 2 hours to form the suspension;
adding (203) KMnO4 to the suspension and raising (204) the temperature from 303 to 328 K within 2 hours until the suspension becomes pasty brownish;
adding (205) DI water to th