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Method for preparing graphene by using waste lithium ion power battery

A lithium-ion battery and power battery technology, which is applied in the new technology field of solid waste recycling, can solve the problems of ecological environment impact, poor controllability, graphene integrity damage, etc., and achieve the effect of reducing emissions

Inactive Publication Date: 2020-06-09
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most widely used graphene preparation method is oxidation-reduction method (such as CN 105355996 B a kind of method for separating lithium and graphite from waste lithium-ion battery negative electrode material and resource utilization), although the cost of oxidation-reduction method is relative to Vapor deposition method and crystal epitaxial growth method are relatively low, but this method needs to consume a large amount of acids, oxidants and reducing agents that are harmful to the environment and organisms, which will affect the ecological environment
In addition, the electronic structure and crystal integrity of graphene prepared by this method are damaged by strong oxidants, which seriously affects the performance of graphene.
And the patent CN 10876755 A is a method for preparing graphene and reclaiming lithium by using graphite electrodes for waste lithium-ion batteries as raw materials, and CN 102530930 B is a method for preparing graphene by electrochemical exfoliation. Although the structure of graphene obtained by this method is relatively complete, it is necessary to provide lithium salt as an intercalation agent and the stripping process must supply electric energy, and the preparation cost of graphene is relatively high.
CN 103508446A A method for preparing graphene using graphite electrodes of waste lithium-ion batteries does not use an intercalation agent, but the method of ultrasonically exfoliating graphite has low efficiency, high energy consumption and poor controllability

Method used

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  • Method for preparing graphene by using waste lithium ion power battery
  • Method for preparing graphene by using waste lithium ion power battery
  • Method for preparing graphene by using waste lithium ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Sorting the battery cells with a battery capacity greater than 60% of the nominal capacity from the decommissioned lithium-ion batteries, charging the sorted battery cells to a state of charge of 90%, and disassembling the charged battery cells And isolate the negative electrode sheet, and obtain the negative electrode powder after ball milling the negative electrode sheet for 15 minutes, sieve the negative electrode powder with an 80-mesh sieve, collect the sieve and the sieve, the sieve is copper, and the The undersize was added to an organic solvent and sonicated for 3 hours with stirring. After the ultrasonic treatment, the organic solvent was filtered under reduced pressure, washed with deionized water and vacuum-dried to obtain graphene powder, the graphene exfoliation rate was 98%, the number of graphene layers was less than 10, and the graphene size was 500nm to 1 μm , the ratio I of the D peak and the G peak peak intensity in the obtained powder Raman spectrum ...

Embodiment 2

[0020] Sorting the battery cells with a battery capacity greater than 70% of the nominal capacity from the decommissioned lithium-ion batteries, charging the sorted battery cells to a state of charge of 0.6, disassembling the charged battery cells and Separate the negative electrode sheet, ball mill the isolated negative electrode sheet for 20 minutes to obtain negative electrode powder, sieve the negative electrode powder with an 80-mesh sieve, collect the sieve and the sieve, the sieve is copper, and the The undersize was added to the organic solvent and sonicated for 1 hour with stirring. After the ultrasonic treatment, the organic solvent was centrifuged and the suspension was collected, the suspension was filtered under reduced pressure, cleaned with deionized water and vacuum-dried to obtain graphene powder with a graphene exfoliation rate of 80%, graphite The number of ene layers is 4 to 10, and the graphene size is 1 μm to 2 μm. The ratio of the D peak to the G peak pe...

Embodiment 3

[0022] Sorting battery cells with a battery capacity greater than 50% of the nominal capacity from retired lithium-ion batteries, charging the sorted battery cells to a state of charge of 100%, and disassembling the charged battery cells And isolate the negative electrode sheet, and obtain the negative electrode powder after ball milling the negative electrode sheet for 15 minutes, sieve the negative electrode powder with an 80-mesh sieve, collect the sieve and the sieve, the sieve is copper, and the The undersize was added to the organic solvent and sonicated for 1 hour with stirring. After the ultrasonic treatment, the organic solvent was centrifuged and the suspension was collected, the suspension was filtered under reduced pressure, cleaned with deionized water and vacuum-dried to obtain graphene powder with a graphene exfoliation rate of 92%, graphite The number of ene layers is less than 10, and the graphene size is 1 μm to 5 μm. The ratio of the peak intensity of the D ...

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Abstract

The invention relates to a method for preparing graphene by using a retired lithium ion power battery negative electrode material, which belongs to a new solid waste recycling technology in the fieldof comprehensive utilization of waste resources. The method is characterized in that the method is specifically characterized by comprising the steps; according to the characteristics of the waste lithium ion battery; the lithiated graphite can be obtained by recharging the waste lithium ion battery; by utilizing the characteristics that the interlayer spacing of the lithiated graphite is increased and the acting force between graphite layers is greatly weakened, the graphene powder with 1-4 layers is prepared in a manner of externally applying mechanical force, the size of the obtained graphene product is 500 nanometers to 5 microns, only a few defects (ID / IG (0.34) exist, and the application prospect is good.

Description

technical field [0001] The invention relates to a new method for resource utilization of waste lithium-ion power batteries, which is especially suitable for high value-added recycling of waste battery negative electrode materials containing powdery graphite, and belongs to the new method of resource utilization of solid waste in the field of environmental protection and resource comprehensive utilization. technology. Background technique [0002] Lithium-ion batteries are widely used in many fields such as energy storage, transportation, and mobile devices. The general lifespan is 3-8 years. In recent years, the number of scrapped lithium-ion batteries has increased sharply. Although the composition of positive electrode materials in waste lithium-ion batteries varies greatly, the main component of negative electrode materials is graphite, and its content is as high as 10-20%. At present, the recovery technology (such as hydrometallurgy technology) of scrap lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19H01M10/54H01M10/0525
CPCC01B32/19H01M10/54H01M10/0525C01B2204/04C01B2204/32Y02W30/84Y02E60/10
Inventor 张付申贺凯张志远
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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