Method for preparing graphene by recycling graphite cathode material from power batteries

Abstract

The invention relates to the field of recycling of waste batteries, and discloses a method for simply and efficiently preparing reduced graphene oxide by recycling graphite cathode material from powerbatteries. The method comprises the following steps of detaching cathode pieces from the waste lithium ion batteries, soaking by water, simply separating graphite cathodes and copper foil collectors,replacing water for multiple times, filtering, drying, grinding, and screening, so as to obtain the recycled graphite cathode material; adding an oxidant into the recycled graphite cathode material,and pre-oxidizing, so as to obtain a graphene oxide solution; drying the graphene oxide solution, and performing heat reduction at high temperature, so as to obtain the reduced graphene oxide. The method has the advantages that the method is simple and efficient, the added value of the industry is greatly increased, and the multi-element development of the industry is promoted.

Description

technical field [0001] The invention relates to the field of waste battery recycling, in particular to a method for preparing graphene from graphite negative electrode materials recovered from power batteries Background technique [0002] In today's society, with the development of the economy, a large amount of fossil fuels such as coal and oil are consumed, which brings serious pollution to the environment. Therefore, new energy storage devices are attracting more and more attention. Among them, lithium-ion batteries are widely used in portable mobile communication devices, notebook computers, emergency energy storage due to their high energy density, long cycle life, and relatively safe use. Devices, new energy vehicles and other aspects have a wide range of applications. [0003] Generally speaking, the service life of lithium-ion power batteries is only 3 to 4 years, and the service life of lithium iron phosphate power batteries is only 7 to 8 years. , the actual batt...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, there is a method of using a stripping agent to peel off graphite to prepare graphene. A large amount of organic solvents such as alcohols, ketones, esters, amines, sulfones, and chlorobenzenes are used in the experimental process, which requires high airtightness of the equipment and a large amount of organic solvents. Inadvertent solvent treatment will also cause serious pollution to the environment; there is also a method of combining electrochemical exfoliation and ultrasound to prepare graphene solution, and then prepare graphene, but in the ultrasonic process, N,N- Toxic solvents such as dimethylformamide (DMF) or N-methylpyrrolidone (NMP) are highly toxic and dangerous

In the reduction process of graphite oxide, toxic substances such as hydrazine hydrate are often used, which is extremely dangerous.

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