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Method for preparing electric Fenton cathode by recycling graphite from negative electrode of lithium ion battery

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, relieve environmental pressure, strong application prospects and Feasibility effect

Active Publication Date: 2018-06-05
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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  • Method for preparing electric Fenton cathode by recycling graphite from negative electrode of lithium ion battery
  • Method for preparing electric Fenton cathode by recycling graphite from negative electrode of lithium ion battery
  • Method for preparing electric Fenton cathode by recycling graphite from negative electrode of lithium ion battery

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Embodiment 1

[0060] This embodiment provides a method for preparing an electric Fenton cathode by recovering graphite from the negative electrode of a lithium ion battery. The specific method is:

[0061] (1) Disassemble the recovered lithium ion battery to obtain a carbon-coated copper foil for the negative electrode.

[0062] (2) Trim the carbon-coated copper foil into 1×1cm 2 The small pieces, 100W ultrasonic vibration until all graphite powder comes off the copper foil.

[0063] (3) Add the recovered waste graphite to the 2mol / L hydrochloric acid solution heated to 60℃ in advance 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 of 2V%, stirring for 2h, after the completion of the reaction, filtering, the filter residue needs to be washed with water at least three times to remove residual acid and metal ions. The filter residue is collected and dried overnight in an o...

Embodiment 2

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

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

[0080] The test method of the electric Fenton cathode obtained in this example 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 by recovering graphite from the negative electrode of a lithium ion battery. The specific steps are as follows:

[0083] (1) Disassemble the recovered lithium ion battery to obtain a carbon-coated copper foil for the negative electrode.

[0084] (2) Trim the carbon-coated copper foil into 1×1cm 2 The small pieces, 60W ultrasonic vibration until all graphite powder comes off the copper foil.

[0085] (3) Add the recovered waste graphite to the 1mol / L nitric acid solution heated to 50℃ in advance 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%, stirring for 1h, after the reaction is over, filtering, the filter residue needs to be washed with water at least three times to remove residual acid and metal ions. The filter residue is collected and placed in an oven to dry overnight ...

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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 the 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 electrical and electronic power 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 US$221 by 2024. The average service life of lithium batteries is only 3 to 5 years. In the production process of lithium batteries, unqualified waste batteries appear due to errors in the production process. The unqualified rate is about 10% to 20% of the total production. With the increase in battery consumption, the total a...

Claims

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Application Information

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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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