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Regeneration method of ionic liquid coated waste power battery artificial graphite material

A technology for ionic liquids and power batteries, which is applied in the field of regeneration of artificial graphite materials coated with ionic liquids in waste power batteries, and can solve problems such as cycle stability and poor rate performance

Active Publication Date: 2019-09-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to make up for the deficiencies of the recycled artificial graphite’s bare surface, poor cycle stability and rate performance, and to coat the surface of the artificial graphite with ionic liquid through solid-liquid phase mixing and coating, and then carry out high-temperature Carbonization, cations of ionic liquids as carbon source precursors for encapsulation, anions as dopant sources and pore formers

Method used

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  • Regeneration method of ionic liquid coated waste power battery artificial graphite material
  • Regeneration method of ionic liquid coated waste power battery artificial graphite material
  • Regeneration method of ionic liquid coated waste power battery artificial graphite material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Take 5 grams of recycled artificial graphite powder. After ball milling at 400r / min for 3 hours, disperse in 3mol / L nitric acid solution, heat and stir at 80°C for 2 hours, filter and wash. Dry in a vacuum oven at 60°C overnight. The dried material was mixed with 10 grams of 1-ethyl-3-methylimidazole bis-trifluoromethanesulfonimide ionic liquid, and ball milled at 300 rap / min for 5 hours. Calcined at 650° C. for 3 hours under an argon atmosphere. A regenerated artificial graphite negative electrode doped with regenerated ionic liquid and coated with ultrathin carbon is obtained.

[0024] Further analysis of the regenerated graphite samples by electron microscopy revealed that the surface of the material is smooth and free of impurities, and at the same time the surface is covered with a coated carbon layer to achieve carbon coating. X-ray diffraction (XRD) test obtained pattern is consistent with commercial artificial graphite, without impurity peak, shows that sampl...

Embodiment 2

[0026] Take 5 grams of recycled artificial graphite powder. After ball milling at 300r / min for 4 hours, disperse in 3mol / L hydrochloric acid solution, heat and stir at 60°C for 3 hours, filter and wash. Dry in a vacuum oven at 60°C overnight. The dried material was mixed with 3 grams of 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid, and ball milled at 400 rap / min for 5 hours. Calcined at 600° C. for 2.5 hours under a helium atmosphere. Obtain the regenerated artificial graphite negative electrode doped with regenerated ionic liquid and coated with ultra-thin carbon.

Embodiment 3

[0028] Take 5 grams of recycled artificial graphite powder. After ball milling at 450r / min for 2 hours, disperse in 3mol / L sulfuric acid solution, heat and stir at 70°C for 3 hours, filter and wash. Dry in a vacuum oven at 60°C overnight. The dried material was mixed with 7 grams of 1-propyl-3-methylimidazole bis-trifluoromethanesulfonamide ionic liquid, and ball milled at 450 rap / min for 5 hours. Calcined at 550° C. for 4 hours under nitrogen atmosphere. A regenerated artificial graphite negative electrode doped with ultrathin carbon coated with regenerated ionic liquid is obtained.

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Abstract

The invention discloses a regeneration method of an ionic liquid coated waste power battery artificial graphite material, and belongs to the field of battery recovery. A recovered artificial graphite material is subjected to impurity removal, then is subjected to ball milling and annealing together with ionic liquid and is coated with carbon, so that the material regeneration is realized. The method comprises the following steps: (1), carrying out ball milling and acid washing on the waste power battery graphite material to remove impurities; and (2), performing mixed ball milling on the artificial graphite electrode material obtained in the step (1) and the ionic liquid, and performing calcining in an inert atmosphere to obtain an ultra-thin carbon-coated ionic liquid regenerated artificial graphite negative electrode. The method disclosed by the invention is concise in process flow and short in reaction time; and the pollution-free cyclic regeneration of artificial graphite is realized.

Description

technical field [0001] The invention relates to a method for regenerating artificial graphite materials of waste power batteries coated with ionic liquid, which belongs to the field of battery recycling. Background technique [0002] The crystallinity of artificial graphite is low, and the overall performance is isotropic. It improves the compression density of the pole piece and the wettability with the electrolyte, and the larger interplanar spacing is conducive to the structural stability of the material during the process of lithium ion intercalation and extraction. Therefore, artificial graphite is a better negative electrode material for power batteries. Affected by national energy subsidies, the utilization rate of artificial graphite in the negative electrode of power batteries continues to grow. However, the processing procedures of artificial graphite are cumbersome, and a large amount of waste gas and dust will be generated during the production process. Due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C01B32/21
CPCC01B32/21H01M10/54Y02W30/84
Inventor 张海涛邢春贤张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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