CN111029676A - Method for recycling waste lithium ion battery cathode graphite plate - Google Patents

Method for recycling waste lithium ion battery cathode graphite plate Download PDF

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Publication number
CN111029676A
CN111029676A CN201911279275.2A CN201911279275A CN111029676A CN 111029676 A CN111029676 A CN 111029676A CN 201911279275 A CN201911279275 A CN 201911279275A CN 111029676 A CN111029676 A CN 111029676A
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CN
China
Prior art keywords
graphene
lithium ion
ion battery
hydrogen peroxide
graphite powder
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Pending
Application number
CN201911279275.2A
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Chinese (zh)
Inventor
马磊
刘才
靳海波
韩格
易虹
何广湘
郭晓燕
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Beijing Institute of Petrochemical Technology
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Beijing Institute of Petrochemical Technology
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Priority to CN201911279275.2A priority Critical patent/CN111029676A/en
Publication of CN111029676A publication Critical patent/CN111029676A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/54—Reclaiming serviceable parts of waste accumulators
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/20—Removal of unwanted matter, e.g. deodorisation or detoxification
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/30—Physical treatment, e.g. electrical or magnetic means, wave energy or irradiation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/84—Recycling of batteries or fuel cells

Abstract

The invention relates to a method for preparing graphene by recycling a waste lithium ion battery cathode graphite plate, and applying the graphene to synthesis of an electro-Fenton electrode to produce hydrogen peroxide in situ for cleaning fruits and vegetables. The preparation method of the graphene comprises the steps of grinding a waste lithium ion battery cathode graphite plate to obtain graphite powder, mixing the graphite powder with a reducing agent with a certain concentration, adding the mixture into N-methyl pyrrolidone, and carrying out ultrasonic treatment with a certain power for 1-5 hours to obtain a graphene suspension. And transferring the graphene suspension mixed adhesive to carbon paper through a dripping and coating method to obtain the electrode for in-situ production of hydrogen peroxide. The hydrogen peroxide produced by the electrode has high concentration and high efficiency, and can quickly treat pesticide residues on the surfaces of fruits and vegetables.

Description

Method for recycling waste lithium ion battery cathode graphite plate
Technical Field
The invention belongs to the technical field of household food processing technology and water environment protection, and relates to a method for preprocessing a waste lithium ion battery cathode graphite plate to obtain graphene and further preparing the graphene electrode capable of generating hydrogen peroxide in situ. The method can be used for treating organic wastewater and cleaning household fruits and vegetables.
Background
Lithium ion batteries are rapidly increasing in use as power and power supply devices for electric vehicles and consumer electronics. In recent years, the sales of lithium ion batteries have increased by 30% every year in terms of battery capacity. The disposal and recycling of waste lithium ion batteries is currently very inadequate compared to the dramatic increase in lithium ion battery consumption. According to measurement, due to economic and technical limitations, the recovery rate is less than 1%. The production of future spent lithium ion batteries will increase dramatically as the life of the lithium ion battery at an early stage expires. Therefore, the development of a recycling technology of the lithium ion battery is urgently needed. The cathode graphite plate in the lithium ion battery is used as an important component of the lithium ion battery, and the recycling of the cathode graphite plate is also important.
Graphene (Graphene) is a polymer made of carbon atoms in sp2The hybrid tracks form a hexagonal honeycomb lattice two-dimensional carbon nanomaterial. The material has excellent optical, electrical and mechanical properties, has important application prospects in the aspects of materials science, micro-nano processing, energy, biomedicine, drug delivery and the like, and is considered to be a revolutionary material in the future. Due to its excellent electrochemical properties, graphene is often used in lithium ion batteries, fuel cells, and in environmental electrochemistry. Researches on preparing graphene into an electrode for in-situ generation of hydrogen peroxide have been researched by researchers at present, but most of the used graphene raw materials are commercialized graphite materialsThe material cost is high. The raw material used in the invention is the waste cathode graphite plate, which has the effects of changing waste into valuable and recycling, and has better application prospect.
Since the 90 s of the last century, Electrochemical Advanced Oxidation Processes (EAOPs) have attracted considerable interest because they electrochemically generate very strong oxidizing species hydroxyl radicals. Electro-Fenton (Electro-fenton) in EAOPs belongs to a technology with a good development prospect. The hydrogen peroxide can be generated in situ, so that the storage and transportation of the hydrogen peroxide are saved, and the method has great advantages compared with the traditional Fenton process. The principle is shown in formulas (1) and (2):
O2+2H++2e-→H2O2(1)
H2O2+Fe2+→Fe3++·OH+HO-(2)
besides being used for traditional industrial organic wastewater treatment, the electro-Fenton technology has other applications, such as fruit and vegetable cleaning in daily life.
The problem of pesticide residue exists in the current commercially available fruits and vegetables, and the pesticide residue on the surfaces of the fruits and vegetables is difficult to be simply cleaned by tap water. Therefore, the market of the fruit and vegetable cleaner industry in China is wide and rapidly increased. Currently, fruit and vegetable cleaners on the market can be divided into ultrasonic fruit and vegetable cleaners, ozone fruit and vegetable cleaners, and ultrasonic and ozone combined fruit and vegetable cleaners according to principles. The commercial fruit and vegetable cleaning devices generally have the problems of low technical content, common cleaning effect or harm to human bodies and the like. For example, ultrasonic fruit and vegetable cleaning machines have a poor effect on pollutants such as pesticides and fruit waxes with strong adhesion. Ozone generated by the ozone fruit and vegetable cleaning machine is harmful to human bodies. Therefore, a new generation of fruit and vegetable cleaning machine is urgently needed to be developed. If the electro-Fenton technology is applied to fruit and vegetable cleaning, the problem of the fruit and vegetable cleaner can be solved. The reason is that (1) hydrogen peroxide is generated in situ by electro-Fenton, and the hydrogen peroxide generates hydroxyl free radicals under the action of an electric field, so that pesticide residues on the surfaces of fruits and vegetables are directly removed, and the problem of common cleaning effect can be solved. (2) The concentration of the hydrogen peroxide generated in situ is low, and the oxidation of the hydrogen peroxide is weak, so that the hydrogen peroxide is harmless to the health of human bodies.
Disclosure of Invention
In order to achieve the purpose and improve the removing effect of the fruit and vegetable cleaner, the invention discloses a completely novel method for synthesizing waste graphite into graphene, and also discloses a completely novel method for preparing an electrode of the fruit and vegetable cleaner by taking the graphene as a main material. The specific technical scheme is as follows.
A method for recycling waste lithium ion battery cathode graphite plates comprises the following steps:
grinding a cathode graphite plate into 60-100 meshes of graphite powder by adopting a ball mill, mixing the graphite powder with a reducing agent (sodium citrate, sodium hydroxide and cane sugar) with a certain concentration (0.1-0.8mol/L), adding the mixture into 10g/L of N-methyl pyrrolidone, and carrying out ultrasonic treatment for 1-5h under the power of 10-100 kW to obtain the graphene suspension.
And further, sequentially dripping an adhesive and the graphene suspension on carbon paper, and airing to obtain the stable working electrode. The adhesive comprises vinylidene fluoride or polytetrafluoroethylene.
Further, the obtained working electrode is taken as a cathode, the ruthenium-titanium electrode is taken as an anode, and the current density is 20-200mA/cm2The concentration of the obtained hydrogen peroxide is 5-100mg/L under the condition that the pH value of the solution is 3-7. When the solution is used for cleaning fruits and vegetables, the pesticide residues on the surfaces of the fruits and vegetables can be quickly removed.
Compared with the existing fruit and vegetable cleaner, the fruit and vegetable cleaner has the advantages that:
(1) hydrogen peroxide can be generated in situ, hydroxyl free radicals can be generated under the action of an electric field, and the cleaning effect of fruits and vegetables is good;
(2) the generated hydrogen peroxide has small oxidation and small harm to human health;
(3) the hydrogen peroxide has high generation efficiency and low cost.
Drawings
FIG. 1 is a scanning electron microscope image of graphene cathodes according to the method of the present invention.
FIG. 2 is a schematic diagram of the amount of hydrogen peroxide generated by cathodic electro-reduction of graphene according to the present invention.
FIG. 3 is a diagram showing the effect of the graphene fruit and vegetable cleaner on cleaning Chinese chives.
FIG. 4 is a graph showing the effect of the graphene fruit and vegetable cleaner on cleaning grapes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1:
the pesticide thiophanate-methyl is a common pesticide residue on the surface of the Chinese chives. The effect of the graphene fruit and vegetable cleaner on cleaning the residue on the surface of the Chinese chives will be described in this embodiment.
(1) Taking a waste lithium ion battery cathode graphite plate, soaking and cleaning the waste lithium ion battery cathode graphite plate with acetone for 30min, grinding the cathode graphite plate into 90-mesh graphite powder by using a ball mill, and accurately weighing 5g for later use.
(2) Graphite powder is mixed with 0.2mol/L sodium citrate reducing agent, added into 10g/L N-methyl pyrrolidone and ultrasonically acted for 3 hours under the power of 20 kW.
(3) And (3) sequentially dripping the polyvinylidene fluoride and the prepared graphene on carbon paper, and airing to obtain a stable working electrode to form the graphene fruit and vegetable cleaner.
(4) 10ml of 1 per mill thiophanate-methyl is uniformly sprayed on the surface of 1000g of Chinese chives. 50g of Chinese chives are transferred into a fruit and vegetable cleaner developed according to the invention, and the current density is 20mA/cm2Under the condition, the Chinese chives are cleaned for 30min, 2g of Chinese chives samples are taken every 5 min, and the cleaning effect is detected according to the characterization NY/T761-2008, and the result is shown in figure 3.
Example 2:
the pesticide moldaoke is a common pesticide residue on the surface of grapes. The effect of the graphene fruit and vegetable cleaner on cleaning the surface residue of the grapes will be described in the embodiment.
(1) Taking a waste lithium ion battery cathode graphite plate, soaking and cleaning the waste lithium ion battery cathode graphite plate with acetone for 30min, grinding the cathode graphite plate into 80-mesh graphite powder by using a ball mill, and accurately weighing 5g for later use.
(2) Graphite powder is mixed with 0.2mol/L sodium hydroxide reducing agent, added into 10g/L N-methyl pyrrolidone and ultrasonically acted for 3 hours under the power of 40 kW.
(3) And (3) sequentially dripping polytetrafluoroethylene and the prepared graphene on carbon paper, and airing to obtain a stable working electrode to form the graphene fruit and vegetable cleaner.
(4) 10ml of 1 thousandth of mould is evenly sprayed on the surface of 1000g of grapes. 50g of grapes are taken and transferred into a fruit and vegetable cleaner developed according to the invention, and the current density is 40mA/cm2Under the condition, grape cleaning is carried out for 30min, 2g of grape samples are taken every 5 min, and the cleaning effect is detected according to characterization NY/T761-2008, and the result is shown in FIG. 4.
The above embodiments describe the technical solutions of the present invention in detail. It will be clear that the invention is not limited to the described embodiments. Based on the embodiments of the present invention, those skilled in the art can make various changes, but any changes equivalent or similar to the present invention are within the protection scope of the present invention.

Claims (9)

1. A method for recycling waste lithium ion battery cathode graphite plates is characterized by comprising the following steps:
1) grinding the cathode graphite plate into graphite powder by adopting a ball mill,
2) the obtained graphite powder is mixed with a reducing agent and then added into N-methyl pyrrolidone,
3) and (3) carrying out ultrasonic treatment on the product obtained in the step 2) to obtain a graphene suspension.
2. The method as claimed in claim 1, wherein the graphite powder in step 1) is 60-100 mesh graphite powder.
3. The method of claim 1, wherein the reducing agent of step 2) comprises sodium citrate, sodium hydroxide or sucrose at a concentration of 0.1-0.8 mol/L.
4. The method according to claim 1, wherein the concentration of N-methylpyrrolidone in step 2) is 10 g/L.
5. The method according to claim 1, wherein the sonication in step 3) is carried out at a power of 10KW to 100KW and a treatment time of 1-5 h.
6. The method as claimed in claim 1, further comprising a step 4) of sequentially applying the adhesive and the graphene suspension onto the carbon paper in a dropwise manner, and drying the carbon paper to obtain the stable working electrode.
7. The method of claim 6, wherein the adhesive comprises vinylidene fluoride or polytetrafluoroethylene.
8. The method as claimed in claim 6, further comprising a step 5) of forming the fruit and vegetable washer by using the obtained working electrode as a cathode and the ruthenium-titanium electrode as an anode.
9. Use of the fruit and vegetable cleaner made according to the method of claim 6, characterized in that 20-200mA/cm is applied2The current density of the washing water is adjusted to 3-7, hydrogen peroxide with the concentration of 5-100mg/L is obtained, and the fruits and vegetables are washed.
CN201911279275.2A 2019-12-13 2019-12-13 Method for recycling waste lithium ion battery cathode graphite plate Pending CN111029676A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102868006A (en) * 2012-09-21 2013-01-09 华东理工大学 Method for preparing graphene through waste lithium batteries
CN103259062A (en) * 2013-04-17 2013-08-21 清华大学深圳研究生院 Method for regenerating graphene by recovering waste lithium ion battery
CN103508446A (en) * 2012-06-26 2014-01-15 海洋王照明科技股份有限公司 Method for preparing graphene by utilizing graphite electrodes of waste lithium ion batteries
KR101621312B1 (en) * 2015-10-15 2016-05-16 이치헌 Method Of Recycling Resource for lithium ion secondary battery
CN107163564A (en) * 2017-05-16 2017-09-15 华生管道科技有限公司 A kind of preparation method of graphene modified plastics
CN108123186A (en) * 2017-12-22 2018-06-05 中国科学院过程工程研究所 A kind of method that graphite is recycled from negative electrode of lithium ion battery and prepares electric Fenton cathode
CN108767355A (en) * 2018-06-04 2018-11-06 河南工程学院 A method of preparing graphene and recycling lithium using waste lithium cell with graphite electrode as raw material

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103508446A (en) * 2012-06-26 2014-01-15 海洋王照明科技股份有限公司 Method for preparing graphene by utilizing graphite electrodes of waste lithium ion batteries
CN102868006A (en) * 2012-09-21 2013-01-09 华东理工大学 Method for preparing graphene through waste lithium batteries
CN103259062A (en) * 2013-04-17 2013-08-21 清华大学深圳研究生院 Method for regenerating graphene by recovering waste lithium ion battery
KR101621312B1 (en) * 2015-10-15 2016-05-16 이치헌 Method Of Recycling Resource for lithium ion secondary battery
CN107163564A (en) * 2017-05-16 2017-09-15 华生管道科技有限公司 A kind of preparation method of graphene modified plastics
CN108123186A (en) * 2017-12-22 2018-06-05 中国科学院过程工程研究所 A kind of method that graphite is recycled from negative electrode of lithium ion battery and prepares electric Fenton cathode
CN108767355A (en) * 2018-06-04 2018-11-06 河南工程学院 A method of preparing graphene and recycling lithium using waste lithium cell with graphite electrode as raw material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刘才等: "Na0.44MnO2纳米棒/石墨烯正极的制备和电化学储锂性能", 《化工学报》 *

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Application publication date: 20200417

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