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A kind of method that recovers graphite from lithium-ion battery negative pole to prepare electric Fenton cathode

A lithium-ion battery and graphite technology, which is applied in the field of recycling graphite to prepare electro-Fenton cathodes, can solve problems such as environmental hazards of waste lithium-ion batteries, achieve good electro-Fenton degradation characteristics of pollutants, reduce investment costs, and realize resource utilization Effect

Active Publication Date: 2020-09-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method for preparing the electric Fenton cathode by reclaiming graphite from the negative electrode of the lithium ion battery provided by the present invention reclaims the graphite from the waste lithium ion battery, and applies it to the preparation of the electric Fenton cathode in combination with its oxidation-reduction characteristics, greatly improving the The degradation efficiency of pollutants not only solves the environmental hazards of waste lithium-ion batteries but also improves the economic benefits of the electric Fenton pollutant treatment process

Method used

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  • A kind of method that recovers graphite from lithium-ion battery negative pole to prepare electric Fenton cathode
  • A kind of method that recovers graphite from lithium-ion battery negative pole to prepare electric Fenton cathode
  • A kind of method that recovers graphite from lithium-ion battery negative pole to prepare electric Fenton cathode

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Embodiment 1

[0060] The present embodiment provides a method for reclaiming graphite from lithium-ion battery negative pole to prepare electric Fenton cathode, the specific method is:

[0061] (1) The recovered lithium-ion battery is disassembled to obtain the negative electrode carbon-coated copper foil.

[0062] (2) Trim the carbon-clad copper foil to 1×1cm 2 Small pieces, 100W ultrasonic vibration until all the graphite powder falls off from the copper foil.

[0063] (3) Add the recovered waste graphite to the 2mol / L hydrochloric acid solution previously heated to 60°C according to the solid-to-liquid ratio of 50g / L, and then add H 2 o 2 solution, hydrochloric acid and H 2 o 2 In the mixture formed by the solution, H 2 o 2 The volume fraction is 2V%, stirred for 2 hours, and filtered after the reaction is completed, and the filter residue needs to be washed with water at least three times to remove residual acid and metal ions. Collect the filter residue, put it into an oven and ...

Embodiment 2

[0078] This embodiment provides a method for recovering graphite from the negative electrode of a lithium-ion battery to prepare an electric Fenton cathode. For the specific steps, refer to Example 1. The difference is that in step (3), the sodium hydroxide leaching operation is cancelled, and only hydrochloric acid leaching is performed. operate.

[0079] The graphite powder with higher purity obtained in step (3) of this embodiment is typical layered graphite with a purity of 99.68%.

[0080] The test method of the electric Fenton cathode obtained in this embodiment refers to Example 1, and the test results are shown in Table 1.

Embodiment 3

[0082] This embodiment provides a method for preparing an electric Fenton cathode from reclaiming graphite from the negative electrode of a lithium-ion battery, and its specific steps are:

[0083] (1) The recovered lithium-ion battery is disassembled to obtain the negative electrode carbon-coated copper foil.

[0084] (2) Trim the carbon-clad copper foil to 1×1cm 2 Small pieces, 60W ultrasonic vibration until all the graphite powder falls off from the copper foil.

[0085] (3) Add the recovered waste graphite to the 1mol / L nitric acid solution previously heated to 50°C according to the solid-to-liquid ratio of 60g / L, and then add H 2 o 2 solution, nitric acid and H 2 o 2 In the mixture formed by the solution, H 2 o 2 The volume fraction is 6V%, stirred for 1 h, and filtered after the reaction is completed, and the filter residue needs to be washed with water at least three times to remove residual acid and metal ions. Collect the filter residue and put it into an oven ...

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Abstract

The invention provides a method for preparing an electric Fenton cathode by recycling graphite from a negative electrode of a lithium ion battery. The method comprises the following steps: (1), takinga negative electrode sheet of the lithium ion battery; (2), performing ultrasonic stripping on the negative electrode sheet obtained in the step (1), and collecting to obtain stripped graphite powder; (3), leaching the stripped graphite powder obtained in the step (2), filtering, and collecting a filter residue to obtain treated graphite powder; and (4), preparing the treated graphite powder obtained in the step (3) into an electrode slurry, stirring, and laminating onto a base electrode to obtain the electric Fenton cathode. The electric Fenton cathode prepared by the method provided by theinvention has relatively high hydrogen peroxide yield and can efficiently degrade pollutants during pollutant treatment. By the method provided by the invention, environment pollution can be relievedand maximization of the economic benefit is achieved. By the method, the graphite recycling purity can be as high as 99%.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for preparing an electric Fenton cathode by recovering graphite from a negative electrode of a lithium ion battery. Background technique [0002] Because of its high energy density, long cycle life, and no memory effect, lithium-ion batteries have been widely used in many fields such as electronic and electrical vehicles since their commercialization. With the development of the market, the output of lithium-ion batteries has increased year by year. With the development of vehicles, the demand for lithium-ion batteries will reach 221 by 2024. The average service life of lithium batteries is only 3 to 5 years, and in the production process of lithium batteries, unqualified waste batteries appear due to production process errors, and the failure rate is about 10% to 20% of the total production, so lithium With the increase in battery consumption, the total ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 赵赫曹志钦曹宏斌孙峙
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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