CN113224308B - Lithium ion battery cathode binder with self-repairing performance and preparation method and application thereof - Google Patents
Lithium ion battery cathode binder with self-repairing performance and preparation method and application thereof Download PDFInfo
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/02—Polyamines
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
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- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a lithium ion battery cathode binder with self-repairing performance, and a preparation method and application thereof. The adhesive is a cross-linked network polymer containing a large number of sulfydryl functional groups, and has self-repairing performance. In the preparation, a component A containing a thio-cyclic carbonate functional group and a component B containing a polyamino functional group are reacted, the thio-cyclic carbonate functional group is subjected to ring opening in the reaction and reacts with the polyamino functional group to generate a binder containing a large amount of mercapto functional groups (-SH), and the binder is utilized on a negative electrode material of a lithium ion battery for the first time. Compared with the lithium ion battery prepared by the traditional lithium ion battery binder CMC, the specific capacity and the cycling stability of the lithium ion battery are obviously improved, the initial discharge specific capacity is improved by about 12.7 percent, and the capacity retention rate is about 98.0 percent.
Description
The technical field is as follows:
the invention belongs to the field of lithium ion battery binders. In particular to a preparation method and application of a lithium ion battery cathode binder with self-repairing performance.
Background art:
in the world, people pay more and more attention to the development of scientific technology towards the direction of green, high efficiency, energy conservation and practical development. The lithium ion battery has the following advantages: the lithium ion battery has little pollution, repeated charge and discharge permission, high volume energy density and the like, so the lithium ion battery has good development prospect. However, with the continuous development of society and the increasing demand of life, more stringent requirements are put on lithium ion batteries, and the lithium ion batteries are expected to have more excellent performance, so that the development of lithium ion batteries with more excellent charge and discharge performance, smaller mass and volume and larger capacity (Journal of Power Sources,2016,329,323-329) is currently being pursued. Most of the previous researches have focused on electrode materials, electrolytes and the like of lithium ion batteries, (Appl polymer. sci,2012,125(2), 1027-.
The binder is used as an important component of the lithium ion battery and has the function of ensuring certain bonding strength among active substances and between the active substances and a current collector. At present, carboxymethyl cellulose (CMC) is mainly used as a binder of a negative electrode of a lithium ion battery, but the CMC has high brittleness and poor flexibility. Therefore, CMC is generally mixed with Styrene Butadiene Rubber (SBR), but due to the difference in density of materials, the mixing tends to cause uneven dispersion of the binder in the electrode sheet (electrochem. soc,2012,2(10), 1016). Currently, research and development of a high-performance binder for lithium ion batteries have been the focus of research, so as to improve the performance of lithium ion batteries.
The invention content is as follows:
the invention aims to provide a lithium ion battery cathode binder with self-repairing performance, a preparation method and application thereof aiming at the defects in the prior art. The invention utilizes a component A containing thio-cyclic carbonate functional groups and a component B containing multi-amino functional groups, firstly leads the thio-cyclic carbonate functional groups to open rings in the reaction and react with the multi-amino functional groups to generate a binder containing a large amount of mercapto functional groups (-SH), and utilizes the binder on a negative electrode material of a lithium ion battery for the first time. The adhesive contains a large amount of sulfydryl, and the sulfydryl can react with each other to generate a disulfide bond with self-repairing performance. The disulfide bond can repair the cathode structure damaged by active substance pulverization or volume change in the charging and discharging processes of the lithium ion battery, so that the discharging specific capacity and the electrochemical cycle performance of the lithium ion battery can be effectively improved.
The technical scheme of the invention is as follows:
the negative pole binding agent of the lithium ion battery with self-repairing performance has the following structural formula:
wherein the content of the first and second substances,
the preparation method of the lithium ion battery cathode binder with self-repairing performance comprises the following steps:
adding the component A containing the thio-cyclic carbonate functional group and the component B containing the polyamino functional group into a solvent, reacting for 0.5-24 hours at 50-100 ℃, and then concentrating, dialyzing and drying to obtain the lithium ion battery cathode binder with self-repairing performance;
wherein, the mass ratio is that the component A: the component B is (1-10): (1-10); adding 40-60 mg of the component A into each ml of the solvent;
the solvent is N-methylpyrrolidone (NMP), N' -Dimethylformamide (DMF), dimethyl sulfoxide (DMSO) or water;
the component A containing the thiocyclic carbonate functional group is 1,2,7, 8-diepoxyoctane-thiocyclic carbonate, ethylene glycol diglycidyl ether-thiocyclic carbonate, polyethylene glycol diglycidyl ether-thiocyclic carbonate, bisphenol A epoxy-thiocyclic carbonate, glycidyl ether-thiocyclic carbonate or pentaerythritol glycidyl ether-thiocyclic carbonate;
the component B containing amino functional groups is polyethyleneimine, chitosan, amino cellulose or polylysine (molecular weight range: 800-100000).
The adhesive is a cross-linked network polymer containing a large number of sulfydryl functional groups, and has self-repairing performance.
The preparation method for synthesizing the component A containing the thio-cyclic carbonate functional group comprises the following steps:
and dissolving the substance C in dichloromethane, adding lithium bromide, stirring for 0.5-4 hours under reflux, dropwise adding a carbon disulfide solution, and then refluxing the reaction mixture for 24-48 hours. After the reaction is finished, cooling to room temperature, diluting, extracting, washing an organic phase, drying, and performing rotary evaporation to obtain a corresponding component A product;
the substance C is 1,2,7, 8-diepoxyoctane, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, bisphenol A epoxy, glycidyl ether or pentaerythritol glycidyl ether;
wherein 6-10 mmol of substance C, 0.4-1 mmol of LiBr and 10-18 mmol of CS are added into every 20ml of anhydrous dichloromethane solvent2。
The lithium ion battery binder with self-repairing performance is applied to a negative electrode material of a lithium ion battery.
Ball-milling and mixing the binder, a conductive agent, a negative active substance and a dispersing agent into slurry, and coating the slurry on a current collector with the coating thickness of 15-20 microns; and heating and drying at 60-100 ℃ to obtain the negative electrode material of the lithium ion battery.
Wherein, the mass ratio is that: conductive agent: negative electrode active material: dispersant 1: 0.5-2: (5-18): (20-100);
negative electrode active material for lithium ion battery: the negative active material of the lithium ion battery is one of nano silicon powder, lithium titanate and nano graphite powder.
The conductive agent is acetylene black, Super P, a carbon nano tube or graphene.
The dispersant is N-methylpyrrolidone (NMP), N' -Dimethylformamide (DMF) or water (H)2O)。
The current collector is specifically a copper foil current collector.
The ball milling rotating speed is 300-600 r.min-1Mixing for 4-8 hours under the condition; the loading capacity of the active substance is 1.2-2 mg-cm-2。
The invention has the substantive characteristics that:
aiming at the technical problem to be solved of the lithium ion battery, the invention firstly reacts a component A containing thio cyclic carbonate functional groups with a component B containing polyamino functional groups to generate a novel cross-linked network polymer containing a large number of mercapto functional group side chains. The polymer is used as a binder of the lithium ion battery negative electrode material, so that the negative electrode material has self-repairing performance, the problem of pulverization of the lithium ion battery negative electrode material is solved, and the discharge specific capacity and the cycling stability of the lithium ion battery are greatly improved.
The beneficial effects of the invention are as follows:
the invention firstly reacts a component A containing thio-cyclic carbonate functional groups with a component B containing polyamino functional groups to obtain a novel cross-linked network polymer containing a large number of mercapto functional group side chains, and the novel cross-linked network polymer is used as a binder of a lithium ion battery cathode material. The mercapto functional groups in the adhesive can react with each other to generate disulfide bonds with self-repairing performance. The disulfide bond can repair an electrode structure damaged due to volume change of an electrode active material in the charging and discharging processes, so that the lithium ion battery obtains high discharge specific capacity and high cycling stability. The traditional lithium ion battery binder CMC has no disulfide bond with self-repairing performance, and cannot repair an electrode structure damaged due to volume change, so that the performance of the battery is poor.
Compared with the lithium ion battery prepared by the traditional lithium ion battery binder CMC, the initial specific discharge capacity of the lithium ion battery prepared by the binder is improved by about 12.7%, and the capacity retention rate is about 98.0% (the capacity retention rate of the lithium ion battery prepared by the CMC is 89.8%), so that the binder containing the mercapto functional group and having the self-repairing performance is remarkably improved for the specific capacity and the cycling stability of the lithium ion battery.
Drawings
FIG. 1 shows the NMR spectra of ethylene glycol diglycidyl ether-thiocyclic carbonate obtained in examples 1,2 and 3.
Fig. 2 is an infrared spectrum of the binder for lithium ions having self-repairing properties obtained in examples 1,2 and 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Wherein the waviness represents a polymeric chain of polymer having a molecular weight of 1X 104～1×106g·mol-1。
As shown in equation 1: firstly, ethylene glycol diglycidyl ether and carbon disulfide react to synthesize ethylene glycol diglycidyl ether-thio cyclic carbonate, then the ethylene glycol diglycidyl ether-thio cyclic carbonate reacts with polyethyleneimine with the molecular weight of 800 at the temperature of 60 ℃ for 12 hours to obtain a cross-linked network polymer rich in sulfydryl, and the cross-linked network polymer is used as the adhesive with self-repairing performance in examples 1,2 and 3.
Example 1
The preparation method and the application of the binder for the lithium ion battery with the self-repairing performance are characterized by comprising the following steps of:
(1) synthesizing a component A containing a thio cyclic carbonate functional group, namely ethylene glycol diglycidyl ether-thio cyclic carbonate: 1.32g (7.6mmol) of ethylene glycol diglycidyl ether were dissolved in 20ml of dry dichloromethane, and 0.52g (0.6mmol) of lithium bromide was added. After stirring at reflux for 2 hours, 1.73g (22.8mmol) of carbon disulfide were added dropwise. The reaction mixture was then refluxed for 24 h. After the reaction was completed, the mixture was cooled, diluted with 40ml of deionized water, and then extracted with dichloromethane. Washed with 200ml of deionized water and dried over anhydrous MgSO 4. The methylene chloride was removed by rotary evaporation to give ethylene glycol diglycidyl ether-thiocyclic carbonate.
(2) Synthesizing a binder for lithium ions having self-repairing properties: 100mg of ethylene glycol diglycidyl ether-thiocyclic carbonate containing thiocarbacylic carbonate functional groups and 200mg of polyethyleneimine (with the molecular weight of 800) containing polyamino functional groups are heated and reacted in 2ml of DMF at the temperature of 60 ℃ for 12 hours, and then the mixture is concentrated, dialyzed and dried to obtain the binder for the lithium ion battery cathode with self-repairing performance for later use.
(3) Preparing a negative electrode material of the lithium ion battery by applying the binder for lithium ions with self-repairing performance obtained in the step (2): weighing 0.5000g of commercial graphite powder, 0.0625g of Super-P and 0.0625g of binder, adding 2.6g of deionized water, and mixing the powder mixture into paste with the viscosity of 2000-4000 cps in a ball milling tank. Mixing and processing for 6 hours to be slurry under the condition that the ball milling rotating speed is 400 r/min. Coating the slurry on a copper foil, wherein the coating thickness is 15 mu m, drying the prepared wet pole piece in a vacuum drying oven at 80 ℃ for 12 hours, and cutting the wet pole piece into an electrode piece with the diameter of 10mm, wherein the electrode piece is used as a negative electrode material of a lithium ion battery for later use.
(4) Assembling the lithium ion battery device: in a glove box filled with argon, the pole piece prepared in the step (3) is taken as a negative electrode, a metal lithium piece is taken as a counter electrode and a reference electrode, and 1M LiPF6And EC/DMC (volume ratio 1: 1) is used as electrolyte, and Celgard-2325 model commercial diaphragm is assembled into a CR2025 model standard button cell.
The lithium ion battery prepared by the binder and the lithium ion battery prepared by CMC are respectively subjected to charge-discharge tests on a Xinwei battery tester, after 100 cycles, the tested negative pole piece of the battery is peeled off from the diaphragm under the room temperature condition, and observation shows that a large amount of active substances on the negative pole piece of the lithium ion battery prepared by the traditional CMC binder are peeled off from the current collector, and the active substances on the surface of the current collector are uneven. The lithium ion battery negative pole piece prepared by the binder with the self-repairing performance does not have any active substance falling off, and the surface is almost flat. Therefore, the binder plays a self-repairing role in pulverization of the lithium ion battery negative electrode material in the charging and discharging processes.
This is because the binder contains a large number of disulfide bonds, and a network structure of disulfide bonds is formed. Because the disulfide bond is very close to the disulfide bond, when the disulfide bond is broken, the disulfide bond can be recombined to form a new disulfide bond as long as the disulfide bond is at a proper temperature (the disulfide bond is a weak covalent bond and can be self-repaired at a lower temperature), so that the self-repairing of the material can be realized.
Further, 0.5g of the binder was put into 5mL of 1M LiPF6, EC/DMC (volume ratio 1: 1), stirred for 10min, and then left for 0.5h, and delamination was observed, indicating that the binder was not dissolved, whereby the binder was known as a crosslinked network polymer.
Example 2
The other steps are the same as example 1, except that the mass of the binder added in step (3) is changed from 0.0625g to 0.0280g, and the mass of the Super P added in step (1) is changed from 0.0625g to 0.0280 g;
example 3
The other steps are the same as example 1, except that the mass of the binder added in step (3) is changed from 0.0625g to 0.1000g, and the mass of the Super P added in step (1) is changed from 0.0625g to 0.1000 g;
example 4
The other steps were the same as in example 1, except that 1.32g (7.6mmol) of ethylene glycol diglycidyl ether in step (1) was changed to 2.58g (7.6mmol) of bisphenol A type epoxy;
example 5
The other steps were the same as in example 1 except that 1.32g (7.6mmol) of ethylene glycol diglycidyl ether in step (1) was changed to 1.98g (7.6mmol) of glycerol glycidyl ether;
comparative example 1
The preparation method of the lithium ion battery comprises the following steps
(1) Mixing commercial graphite powder, CMC and Super P according to a mass ratio of 8: 1: weighing 0.5000g, 0.0625g and 0.0625g of the mixture into a ball milling tank, adding 2.6g of deionized water into the ball milling tank to mix the powder mixture into paste with the viscosity of 2000-4000 cps, and mixing and processing the paste for 6 hours to form slurry under the condition that the ball milling rotating speed is 400 r/min. Coating the slurry on a copper foil, wherein the coating thickness is 15 mu m, drying the prepared wet pole piece in a vacuum drying oven at 80 ℃ for 12 hours, and cutting the wet pole piece into an electrode piece with the diameter of 10mm, wherein the electrode piece is used as a negative electrode material of a lithium ion battery for later use.
(2) In a glove box filled with argon, the pole piece prepared in the step (1) is taken as a negative electrode, a metal lithium piece is taken as a counter electrode and a reference electrode, and 1M LiPF6And EC/DMC (volume ratio 1: 1) is used as electrolyte, and Celgard-2325 model commercial diaphragm is assembled into a CR2025 model standard button cell.
Comparative example 2
The other steps are the same as the comparative example 1 except that the mass of the binder added in the step (1) is changed from 0.0625g to 0.0280g and the mass of the Super-P added in the step (1) is changed from 0.0625g to 0.0280 g;
comparative example 3
The other steps are the same as the comparative example 1, except that the mass of the binder added in the step (1) is changed from 0.0625g to 0.1000g, and the mass of the Super-P added in the step (1) is changed from 0.0625g to 0.1000 g;
examples 1,2 and 3 are preparations in which the binder having self-repairing property of the present invention is applied to a lithium ion battery, and comparative examples 1,2 and 3 are lithium ion batteries manufactured using a conventional CMC binder. The lithium ion batteries manufactured by the embodiment 1 and the comparative example 1, the embodiment 2 and the comparative example 2, and the embodiment 3 and the comparative example 3 have the same preparation materials and preparation processes except that the types of the binders are different.
In order to verify the properties of the materials obtained in the above examples 1,2 and 3 and comparative examples 1,2 and 3, the following were subjected to the relevant characterization and performance tests.
Nuclear magnetic hydrogen spectrum
The disulfide lactone functional component A ethylene glycol diglycidyl ether-thio cyclic carbonate prepared in examples 1,2 and 3 is subjected to nuclear magnetic hydrogen spectrum test, specifically, the component A is respectively dissolved in deuterated dimethylSulfoxide (DMSO-d)6) In (1). The test was performed using an AVANCE400 NMR spectrometer from Brucker. FIG. 1 is a NMR spectrum of ethylene glycol diglycidyl ether-thiocyclic carbonate, showing that ethylene glycol diglycidyl ether-thiocyclic carbonate has been successfully synthesized.
(II) Battery cycle Performance test
The lithium ion batteries prepared in examples 1,2 and 3 and comparative examples 1,2 and 3 were subjected to cycle performance test at 0.2C, and the negative active material loading was 1.2 mg-cm-2. As can be seen from table 1, compared with a battery prepared by using CMC as a binder, the lithium ion battery prepared by using the binder with self-repairing performance of the present invention has more excellent specific discharge capacity and cycle stability.
Table 1 binder with self-healing properties or CMC corresponding to the electrochemical cycling test of lithium ion batteries according to the invention
Table 2 binder with self-healing properties or CMC corresponding to the electrochemical cycling test of lithium ion batteries according to the invention
Table 3 binder with self-healing properties or CMC corresponding to the electrochemical cycling test of lithium ion batteries according to the invention
Experimental data analysis shows that the battery performance is the best when the mass ratio of the binder is 10%, so that the data results of the embodiment 1 and the comparative example 1 are compared, and it can be seen that compared with a lithium ion battery prepared by the traditional lithium ion battery binder CMC, the initial discharge specific capacity of the lithium ion battery prepared by the binder is improved by about 12.7%, and the capacity retention rate is improved by about 8.2%. This is because the mercapto functional groups in the binder can react with each other to form disulfide bonds having self-repairing properties. The disulfide bond can repair an electrode structure damaged due to volume change of an electrode active material in the charging and discharging processes, so that the lithium ion battery obtains high discharge specific capacity and high cycling stability.
The performance of the lithium ion batteries of example 4 and example 5 is close to that of example 1.
(III) Infrared Spectroscopy
The binders for lithium ions with self-repairing properties prepared in examples 1,2 and 3 were subjected to infrared spectroscopy, specifically, a layer of light and thin binder was coated on a pressed blank sheet of KBr. The test was performed using a Brucker TENSOR 27 fourier transform infrared spectrometer. Fig. 2 is an infrared spectrum of a binder for lithium ions having self-repairing properties, showing that the binder for lithium ions having self-repairing properties has been successfully synthesized.
The above description is only a few preferred embodiments of the present invention, but the present invention is not limited to the above-mentioned embodiments. The foregoing detailed description is to be considered as illustrative and not restrictive, and changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.
The invention is not the best known technology.
Claims (8)
1. The negative pole binder of the lithium ion battery with self-repairing performance is characterized in that the structural formula of the binder is as follows:
wherein R =
、
、
、
、
Or
。
2. The preparation method of the lithium ion battery negative electrode binder with self-repairing performance as claimed in claim 1, characterized by comprising the following steps:
adding the component A containing the thio-cyclic carbonate functional group and the component B containing the amino functional group into a solvent, reacting for 0.5-24 hours at 50-100 ℃, and then concentrating, dialyzing and drying to obtain the lithium ion battery cathode binder with self-repairing performance;
wherein, the mass ratio is that the component A: component B = (1-10): (1-10); adding 40-60 mg of the component A into each ml of the solvent;
the component A containing the thiocyclic carbonate functional group is 1,2,7, 8-diepoxyoctane-thiocyclic carbonate, ethylene glycol diglycidyl ether-thiocyclic carbonate, polyethylene glycol diglycidyl ether-thiocyclic carbonate, bisphenol A epoxy-thiocyclic carbonate, glycidyl ether-thiocyclic carbonate or pentaerythritol glycidyl ether-thiocyclic carbonate;
the component B containing amino functional groups is polyethyleneimine, and the molecular weight range is as follows: 800 to 100000.
3. The method for preparing a negative electrode binder of a lithium ion battery having self-repairing property according to claim 2, wherein the solvent is N-methylpyrrolidone (NMP), N' -Dimethylformamide (DMF), Dimethylsulfoxide (DMSO), or water.
4. The preparation method of the lithium ion battery negative electrode binder with self-repairing performance as claimed in claim 2, characterized in that the preparation method for synthesizing the component A containing the thio-cyclic carbonate functional group comprises the following steps:
dissolving the substance C in dichloromethane, adding lithium bromide, stirring for 0.5-4 hours under reflux, dropwise adding a carbon disulfide solution, and then refluxing the reaction mixture for 24-48 hours; after the reaction is finished, cooling to room temperature, diluting, extracting, washing an organic phase, drying, and performing rotary evaporation to obtain a corresponding component A product;
the substance C is 1,2,7, 8-diepoxyoctane, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, bisphenol A epoxy, glycidyl ether or pentaerythritol glycidyl ether;
wherein 6-10 mmol of substance C, 0.4-1 mmol of LiBr and 10-18 mmol of CS are added into every 20ml of anhydrous dichloromethane solvent2。
5. The use of a lithium ion battery negative electrode binder having self-healing properties according to claim 1, characterized by a negative electrode material for lithium ion batteries.
6. The application of the lithium ion battery negative electrode binder with self-repairing performance as claimed in claim 5 is characterized by comprising the following steps: ball-milling and mixing the binder, a conductive agent, a negative active substance and a dispersing agent into slurry, and coating the slurry on a current collector with the coating thickness of 15-20 microns; heating and drying at 60-100 ℃ to obtain a negative electrode material of the lithium ion battery;
wherein, the mass ratio is that: conductive agent: negative electrode active material: dispersant = 1: 0.5-2: (5-18): (20-100);
negative electrode active material for lithium ion battery: the negative active material of the lithium ion battery is one of nano silicon powder, lithium titanate and nano graphite powder.
7. The application of the lithium ion battery cathode binder with self-repairing performance as claimed in claim 6, characterized in that the conductive agent is acetylene black, Super P, carbon nanotube or graphene;
the dispersant is N-methylpyrrolidone (NMP), N' -Dimethylformamide (DMF) or water (H)2O）；
The current collector is specifically a copper foil current collector.
8. The application of the lithium ion battery cathode binder with self-repairing performance as claimed in claim 6, wherein the ball milling rotation speed is 300-600 r-min-1Mixing for 4-8 hours under the condition; the loading capacity of the active substance is 1.2-2 mg-cm-2。
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