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Method for preparing graphene through waste lithium batteries

A waste lithium battery and graphene technology, applied in the direction of battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of waste of resources, pollution of the environment, etc., and achieve the effect of avoiding waste, rich sources, and simple methods

Inactive Publication Date: 2013-01-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If it is not recycled, it will not only cause a serious waste of resources, but also pollute the environment
At present, the research on the recycling of waste lithium batteries mainly focuses on heavy metal ions (such as cobalt, copper, nickel, etc.), and few people pay attention to the recycling of graphite resources. Most of the graphite and graphite intercalation compounds in waste lithium batteries are directly It is discarded, which is also a waste of resources

Method used

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  • Method for preparing graphene through waste lithium batteries
  • Method for preparing graphene through waste lithium batteries
  • Method for preparing graphene through waste lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Using Discharged Lithium Metal Batteries

[0046] The waste lithium metal battery used is to use graphite electrode as positive pole, metal lithium sheet as battery negative pole, lithium hexafluorophosphate is dissolved in EC / EMC / DMC (ethylene carbonate / ethyl methyl carbonate / dimethyl carbonate) with a volume ratio of 1:1:1 ) solution in the ternary mixed solvent is used as the electrolyte, and the diaphragm adopts a polypropylene porous membrane. Among them, the graphite electrode is made by combining special spherical graphite SSG (active material) (obtained from Hunan Loudi Huiyu Technology Co., Ltd.), acetylene black (conductive agent, particle size: about 10nm), polyvinylidene fluoride PVDF (binder) Mix according to the mass ratio of 8:1:1, add 1-methyl-2-pyrrolidone (NMP) to make the concentration of PVDF in the range of 0.005-0.03g / ml, stir well, and adjust to paste slurry. Spread it evenly on the copper foil, and use a puncher to make it after the solvent is c...

Embodiment 2

[0054] Direct use of waste lithium metal batteries

[0055] Except that waste batteries are not discharged, all the other operations are the same as in Example 1, and the resulting graphene yield is 0.51%, and the thickness of the graphene obtained is between 2.4 and 9.2, that is, the number of layers is between about 6 and 26 layers, and the length and width are between 120~6300nm, the intensity ratio of D peak and G peak in Raman spectrum I D / I G The value is 0.68.

Embodiment 3

[0057] Using recharged spent Li-ion batteries

[0058] The positive electrode active material of the waste lithium ion battery used is lithium cobalt oxide, and the negative electrode active material is natural graphite 918. The used lithium ion battery voltage is 3.7V. Specifically, the charging operation is that the battery is charged at a constant current at a charging rate of 0.2C until the battery voltage rises to 4.2V. Then charge the battery at a constant voltage until the charging rate drops to 0.02C, and then charge the battery with a constant current at a charging rate of 0.2C to 4.35V, then charge it at a constant voltage until the charging rate drops to 0.02C (test instrument Such as: BTS high-precision battery testing system (manufactured by China Xinwei Electronics Co., Ltd.), model: CT-3008W-5V10mA-S1).

[0059] Then stop charging, disassemble the battery in a glove box with water and oxygen content less than 1ppm, and take out the first-order lithium-graphite...

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Abstract

The invention relates to a method for preparing graphene through waste lithium batteries. The method is characterized in that graphite intercalation compounds in the waste lithium batteries are used as raw materials and stripped to obtain graphene. The method has the advantages that the raw materials are extensive, low in cost and suitable for industrial production, and recycling of resources in the waste lithium batteries is realized while the effective method for preparing graphene is found.

Description

【Technical field】 [0001] The invention relates to a treatment method for waste lithium batteries and the technical field of graphene, in particular, the invention relates to a method for preparing graphene from waste lithium batteries. 【Background technique】 [0002] Graphene is a newly recognized allotrope of carbon element after fullerene and carbon nanotube. 2 The hybrid orbitals are bonded and closely packed to form a carbon material with a two-dimensional honeycomb lattice structure. Its unique structure endows graphene with high specific surface area, excellent electrical properties, optical properties and mechanical properties and other remarkable properties, which makes graphene have great potential in molecular sensors, composite materials, optoelectronic materials, energy storage and other fields. Wide application prospects. Therefore, the preparation and properties of graphene have become a hot spot in nanoscience research in recent years. [0003] In summary, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02E60/12Y02W30/84
Inventor 关士友刘婷婷李星玮崔佳佳
Owner EAST CHINA UNIV OF SCI & TECH
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