CN116130641B - Lithium ion battery polycrystalline phase composite material and pulping method thereof - Google Patents

Lithium ion battery polycrystalline phase composite material and pulping method thereof Download PDF

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CN116130641B
CN116130641B CN202310372436.2A CN202310372436A CN116130641B CN 116130641 B CN116130641 B CN 116130641B CN 202310372436 A CN202310372436 A CN 202310372436A CN 116130641 B CN116130641 B CN 116130641B
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lithium ion
ion battery
electrode material
stirring
composite material
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CN116130641A (en
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金晶
司徒白雪
李良
柏鑫焱
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Shenzhen Zhongxinneng Technology Co ltd
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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/51—Methods thereof
    • B01F23/511—Methods thereof characterised by the composition of the liquids or solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/565—Mixing liquids with solids by introducing liquids in solid material, e.g. to obtain slurries
    • 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
    • H01M10/05—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
    • H—ELECTRICITY
    • 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
    • H—ELECTRICITY
    • 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
    • H—ELECTRICITY
    • 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
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention relates to a polycrystalline phase composite material of a lithium ion battery and a pulping method thereof. The lithium ion battery polycrystalline phase composite material comprises the following components in percentage by weight: 94% -96% of polycrystalline phase composite material, 1.8% -2.2% of adhesive and 1% -3% of conductive agent, the polycrystalline phase composite material of the lithium ion battery also comprises a solvent, the polycrystalline phase composite material is lithium ion positive electrode material or negative electrode active material, and the solvent is deionized water and/or N-methyl pyrrolidone. The pulping method comprises the steps of adding the polycrystalline phase composite material and the adhesive into a double planetary mixer for stirring, adding the solvent and the conductive agent, performing revolution stirring and autorotation stirring through the double planetary mixer, adding the solvent, adjusting the consistency of the slurry, and continuing stirring. The slurry preparation process of the lithium ion battery anode multiphase composite material is flexible and high in efficiency.

Description

Lithium ion battery polycrystalline phase composite material and pulping method thereof
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a polycrystalline phase composite material of a lithium ion battery and a pulping method thereof.
Background
The lithium battery pulping is a mixed dispersion process and is the most important link in the whole production process. In the positive electrode slurry, the dispersibility and uniformity of the granular active material directly influence the movement of lithium ions between two electrodes of a battery, so that the mixing and dispersion of the slurry of each electrode plate material in the production of the lithium ion battery are very important.
The current positive electrode pulping process which is most widely applied to lithium ion batteries is mechanical dispersion, wherein the mechanical dispersion is simple physical dispersion, and the adhesion among particles is destroyed mainly by virtue of mechanical energy such as external shearing force or impact force, so that powder particles are fully dispersed in a medium, and the mechanical dispersion is the dispersion method which is most widely applied at present, and comprises dry pulping and wet pulping. The wet pulping has higher requirements on the stirring device, and the stirring device has short service life and high maintenance cost, so that the utilization rate of equipment is affected; in the wet pulping process, soft material particles are easily formed by active materials, conductive agents and other powder materials and are dispersed in the slurry, so that the slurry is unevenly mixed, and the prepared positive electrode is scrapped due to hard lumps on the surface after the rolling process. The dry pulping is characterized in that a high proportion of solvent is mixed and stirred with the positive electrode material, so that the slurry is difficult to disperse under the conditions of low viscosity and low hardness, and the disadvantages of long mixing and stirring time and poor effect are caused. In the dry pulping process, the slurry is easy to form layering after long-time storage, so that the surface density is uneven during coating, and the coated electrode is heavy or light, so that scrapping is caused.
Accordingly, improvements are needed in the art.
Disclosure of Invention
In the prior art, in the positive electrode pulping process used in the lithium ion battery, in the wet pulping process, active substances, conductive agents and other powder materials are easy to form soft material particles to be dispersed in the slurry, so that the slurry is unevenly mixed, the surface of the prepared positive electrode is hard to be scrapped after the rolling process, and the pulping process in the prior art has defects, so that the invention provides the positive electrode polycrystalline phase composite material of the lithium ion battery and the pulping method thereof.
In order to achieve the above object, in a first aspect, the present invention provides a pulping method of a polycrystalline phase composite material of a lithium ion battery, which is characterized in that the pulping method comprises the following steps:
step S01, adding 94% -96% of polycrystalline phase composite material and 1.8% -2.2% of adhesive into a double planetary mixer for mixing, and mixing for 10-20 min by a revolution mixing rod under the condition of 5-10 HZ, and mixing for 10-20 min by a revolution mixing rod under the condition of 10-15 HZ, wherein the reaction temperature is less than 30 ℃, and the polycrystalline phase composite material is lithium ion positive electrode material or negative electrode active material;
s02, adding a solvent and 1% -3% of a conductive agent, and carrying out revolution stirring and autorotation stirring by using the double-planetary stirrer, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 20-30 HZ, the autorotation frequency is 20-30 HZ, the stirring time is 1-2 h, and the reaction temperature is less than 30 ℃, and the solvent is deionized water and/or N-methylpyrrolidone;
and S03, adding the solvent to adjust the consistency of the slurry, and continuing stirring, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 20-30 HZ, the rotation frequency is 20-30 HZ, the stirring time is 1-2 h, and the reaction temperature is less than 30 ℃.
In one implementation, the lithium ion positive electrode material is any one or a mixture of a plurality of lithium cobaltate, lithium manganate, lithium nickel cobalt aluminate, lithium iron phosphate and lithium iron manganese phosphate.
In one implementation, the negative electrode active material is any one or a mixture of a plurality of natural graphite, artificial graphite, composite graphite, silicon carbon negative electrode and lithium titanate.
In one implementation mode, the adhesive is a composite adhesive formed by any one or more of polyvinyl alcohol, polytetrafluoroethylene, polyvinylidene fluoride, styrene-butadiene rubber, fluorinated rubber, polyurethane and polyacrylonitrile copolymer.
In one implementation mode, the conductive agent is a composite conductive agent composed of any one or more of graphite conductive agent, conductive carbon black, carbon nanotubes, carbon nanofibers, superconductive carbon black and graphene.
In one implementation, in step S01, 94% -96% by weight of the polycrystalline phase composite material and 1.8% -2.2% by weight of polyvinylidene fluoride are added into a double planetary mixer to be mixed; in the step S02, 80 percent of N-methyl pyrrolidone and 1 to 3 percent of conductive carbon black and/or carbon nano tubes by weight percent are added; and S03, adding 20% of N-methyl pyrrolidone to adjust the consistency of the slurry, and continuing stirring.
In a second aspect, the invention also provides a lithium ion battery polycrystalline phase composite material, which is prepared by the pulping method of the lithium ion battery polycrystalline phase composite material, and comprises the following components in percentage by weight: 94% -96% of polycrystalline phase composite material, 1.8% -2.2% of adhesive and 1% -3% of conductive agent.
In one implementation mode, the binder is polyvinylidene fluoride, the conductive agent is a composite conductive agent composed of conductive carbon black and carbon nanotubes, the solvent is N-methylpyrrolidone, and the lithium ion battery polycrystalline phase composite material comprises the following components in percentage by weight: 94.8% of a polycrystalline phase composite material, 2.2% of polyvinylidene fluoride, 2.2% of conductive carbon black and 0.8% of carbon nanotubes.
In one implementation mode, the binder is polyvinylidene fluoride, the conductive agent is a composite conductive agent composed of conductive carbon black and carbon nanotubes, the solvent is N-methylpyrrolidone, and the lithium ion battery polycrystalline phase composite material comprises the following components in percentage by weight: 95.5% of a polycrystalline phase composite material, 2.0% of polyvinylidene fluoride, 1% of conductive carbon black and 1.5% of carbon nanotubes.
In one implementation, the binder is polyvinylidene fluoride, the conductive agent is carbon nanotubes, the solvent is N-methylpyrrolidone, and the lithium ion battery polycrystalline phase composite material comprises the following components in percentage by weight: 96% of a polycrystalline phase composite material, 2.0% of polyvinylidene fluoride and 2.0% of carbon nano tubes.
The beneficial effects are that: according to the multi-crystal phase composite material of the lithium ion battery and the pulping method thereof, raw materials are added in steps through a double planetary mixer for high-temperature dispersion and flocculation, specifically, the multi-crystal phase composite material and the adhesive are mixed and wet, then the solvent and the conductive agent are added for dispersion, and then the solvent is added for adjustment of the thickness of the slurry, so that the stirring and dispersing process for preparing the adhesive in the prior art is omitted, the operation steps are simplified, the problem of generating agglomerate particles in a dry powder prefabrication mixing process is avoided, the risk that the surface coating layer of the material particles is damaged to different degrees due to high-speed shearing force in a dry mixing and wet mixing process of the multi-crystal phase composite material is avoided, and the flexible and high-efficiency lithium ion battery anode multi-phase composite material pulping process is provided.
Drawings
Fig. 1 is a flow chart of steps of a pulping method of a polycrystalline phase composite material of a lithium ion battery.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 in detail, fig. 1 is a flow chart illustrating a pulping method of a polycrystalline phase composite material of a lithium ion battery according to the present invention. The invention provides a pulping method of a polycrystalline phase composite material of a lithium ion battery, which is used for preparing the polycrystalline phase composite material of the lithium ion battery, and comprises the following steps:
step S01, adding 94% -96% of polycrystalline phase composite material and 1.8% -2.2% of adhesive into a double planetary mixer for mixing, and mixing for 10-20 min by a revolution mixing rod under the condition of 5-10 HZ, and mixing for 10-20 min by a revolution mixing rod under the condition of 10-15 HZ, wherein the reaction temperature is less than 30 ℃, and the polycrystalline phase composite material is lithium ion positive electrode material or negative electrode active material;
s02, adding a solvent and 1% -3% of a conductive agent, and carrying out revolution stirring and autorotation stirring by using the double-planetary stirrer, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 20-30 HZ, the autorotation frequency is 20-30 HZ, the stirring time is 1-2 h, and the reaction temperature is less than 30 ℃, and the solvent is deionized water and/or N-methylpyrrolidone;
and S03, adding the solvent to adjust the consistency of the slurry, and continuing stirring, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 20-30 HZ, the rotation frequency is 20-30 HZ, the stirring time is 1-2 h, and the reaction temperature is less than 30 ℃.
The lithium ion battery polycrystalline phase composite material with 70% -73% of solid content is obtained after pulping through the steps.
The invention also provides a lithium ion battery polycrystalline phase composite material, which is prepared by the pulping method and comprises the following components in percentage by weight: 94% -96% of polycrystalline phase composite material, 1.8% -2.2% of adhesive and 1% -3% of conductive agent, wherein the polycrystalline phase composite material of the lithium ion battery further comprises a solvent, the polycrystalline phase composite material is a lithium ion positive electrode material or a negative electrode active substance, and the solvent is deionized water and/or N-methylpyrrolidone (NMP).
Specifically, the lithium ion positive electrode material is any one or a mixture of a plurality of lithium cobaltate, lithium manganate, lithium nickel cobalt aluminate, lithium iron phosphate and lithium iron manganese phosphate. The negative electrode active material is one or a mixture of more of Natural Graphite (NG), artificial Graphite (AG), composite Graphite (CG), silicon carbon negative electrode and lithium titanate.
Further, the adhesive is a composite adhesive composed of any one or more of polyvinyl alcohol (PVA), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), fluorinated rubber, polyurethane and polyacrylonitrile copolymer LA.
Further, the conductive agent is a composite conductive agent composed of any one or more of graphite conductive agent (KS), conductive carbon black (SUP), carbon Nano Tube (CNT), nano carbon fiber, superconductive carbon black and graphene.
In one embodiment, the binder is selected to be PVDF, the conductive agent is a composite conductive agent composed of SUP and CNT, the solvent is NMP, and the lithium ion battery polycrystalline phase composite material comprises the following components in percentage by weight: 94.8% of a multi-phase composite, 2.2% PVDF, 2.2% SUP and 0.8% CNT.
Of these, PVDF is a highly non-reactive thermoplastic fluoropolymer. The modified polyamide is dissolved in strong polar solvents such as dimethylacetamide and the like, has excellent performances such as ageing resistance, chemical resistance, weather resistance, ultraviolet radiation resistance and the like, can be used as engineering plastics for manufacturing sealing ring corrosion-resistant equipment and capacitors, and also can be used as paint, insulating material, ion exchange membrane material and the like. SUP is a fine particle or powder of pure black color, which has strong electric conductivity and is widely used as a conductive agent for lithium ion batteries. The CNT is mainly composed of coaxial circular tubes with a plurality of layers to tens layers of carbon atoms which are arranged in a hexagonal shape, and the coaxial circular tubes can be divided into three types of zigzag, armchair type and spiral type according to different orientations of the carbon hexagons along the axial direction. NMP is colorless to pale yellow transparent liquid, has slight ammonia smell, is mixed with water in any proportion, and is dissolved in diethyl ether, acetone, various organic solvents such as ester, halohydrocarbon, aromatic hydrocarbon and the like, and almost completely mixed with all solvents.
In one embodiment, the binder is PVDF, the conductive agent is a composite conductive agent composed of SUP and CNT, the solvent is NMP, and the lithium ion battery polycrystalline phase composite material comprises the following components in percentage by weight: 95.5% of a multi-phase composite, 2.0% PVDF, 1% SUP and 1.5% CNT.
In another embodiment, the binder is PVDF, the conductive agent is CNT, the solvent is NMP, and the lithium ion battery polycrystalline phase composite material comprises the following components in weight percent: 96% of a multi-phase composite, 2.0% of PVDF and 2.0% of CNT.
In other embodiments, the lithium ion battery polycrystalline phase composite material may further comprise a thickener, the thickener being sodium carboxymethyl cellulose CMC.
Specifically, in step S01, the polycrystalline composite material and the binder are first wetted by adding the polycrystalline composite material and the binder to form a liquid state, so that the polycrystalline composite material and the binder are sufficiently mixed. If the conductive agent is added at the same time, agglomerates are easily formed due to the inconsistent mass densities of the polycrystalline phase composite material, the adhesive and the conductive agent, active substances in slurry are easily mixed unevenly and form particles, and the positive electrode is scrapped due to hard lumps on the surface after the rolling process. Thus, in the present invention, the polycrystalline composite material and the binder are initially subjected to preliminary stirring for a relatively short period of time.
The double-planetary mixer is suitable for the processes of dissolving, mixing and reacting materials from powder to high-viscosity and high-density materials, different mixing paddles can be selected according to different production processes and material characteristics, and the mixing paddles can be selected from twist frame type or multi-paddle blade type. The stirring paddle rotates while revolving, so that the materials flow up and down and around, and the mixing effect can be achieved in a short time. The revolution and the rotation of stirring paddles in a tank of the double-planetary stirrer are both carried out by adopting a variable frequency motor to carry out variable frequency speed regulation, and different rotating speeds can be selected according to different processes and different viscosities. The two double-frame stirrers revolve and rotate simultaneously on the barrel body, so that vacuumizing, heating and cooling can be realized, and the rotating speed can be regulated according to the situation. The kettle body can be heated by electricity, steam, water and oil circulation. In this example, the hydronic heating was performed such that the temperature throughout the reaction was less than 30 degrees celsius.
Specifically, the physical cooling of the stirring barrel by the circulating water is not started at the beginning, so that the temperature of the slurry is raised to 40-60 ℃ through physical friction in stirring, and when the temperature of the outer wall of the stirring barrel reaches 40 ℃, the temperature of the circulating water can be regulated to reduce. The slurry utilizes heat energy in the heating process to quickly and fully dissolve the adhesive, thereby avoiding the formation of agglomerates. The slurry in the whole process keeps the effective circulation of the circulating water of the PD machine, the temperature is less than or equal to 30 ℃, and the vacuum degree is controlled to be-0.090 Mpa-0.095Mpa in the whole reaction process.
In one embodiment, in step S01, 94% -96% by weight of the polycrystalline phase composite material and 1.8% -2.2% by weight of polyvinylidene fluoride are added into a double planetary mixer to be mixed; in the step S02, 80 percent of N-methyl pyrrolidone and 1 to 3 percent of conductive carbon black and/or carbon nano tubes by weight percent are added; and S03, adding 20% of N-methyl pyrrolidone to adjust the consistency of the slurry, and continuing stirring.
Example 1
Step S11, adding 94.8 weight percent of polycrystalline phase composite material and 2.2 weight percent of PVDF into a double-planetary stirrer for stirring, stirring by a revolution stirring rod under the condition of 10HZ for 15min, and stirring by a revolution stirring rod under the condition of 10HZ for 15min, wherein the reaction temperature is less than 30 ℃;
step S12, adding 80% of NMP, 2.2% of SUP and 0.8% of CNT (carbon nanotubes) by weight percentage, and carrying out revolution stirring and rotation stirring by using the double-planetary stirrer, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 20HZ, the rotation frequency is 20HZ, the stirring time is 1.5h, and the reaction temperature is less than 30 ℃;
and S13, adding 20% of NMP to adjust the consistency of the slurry, and continuing stirring, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 25HZ, the rotation frequency is 25HZ, the stirring time is 1.5h, and the reaction temperature is less than 30 ℃.
Example 2
Step S21, adding the polycrystalline phase composite material with the weight percentage of 95% and PVDF with the weight percentage of 2.0% into a double-planetary stirrer for stirring, stirring by a revolution stirring rod for 15min under the condition of 10HZ, and stirring by the revolution stirring rod for 15min under the condition of 10HZ, wherein the reaction temperature is less than 30 ℃;
s22, adding 80% of NMP, 1% of SUP and 1.5% of CNT (carbon nanotubes) by weight percentage, and carrying out revolution stirring and rotation stirring by using the double-planetary stirrer, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 20HZ, the rotation frequency is 20HZ, the stirring time is 1.5h, and the reaction temperature is less than 30 ℃;
and S23, adding 20% of NMP to adjust the consistency of the slurry, and continuing stirring, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 25HZ, the rotation frequency is 25HZ, the stirring time is 1.5h, and the reaction temperature is less than 30 ℃.
Example 3
Step S31, adding 96 weight percent of polycrystalline phase composite material and 2.0 weight percent of PVDF into a double planetary mixer for mixing, and stirring by a revolution stirring rod for 10min under the condition of 5-10 HZ, and stirring by a revolution stirring rod for 20min under the condition of 15HZ, wherein the reaction temperature is less than 30 ℃;
s32, adding 80% of NMP and 2% of CNT (carbon nanotubes) by weight, and carrying out revolution stirring and rotation stirring by using the double-planetary stirrer, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 30HZ, the rotation frequency is 30HZ, the stirring time is 2h, and the reaction temperature is less than 30 ℃;
and step S33, adding 20% of NMP to adjust the consistency of the slurry, and continuing stirring, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 30HZ, the rotation frequency is 30HZ, the stirring time is 2h, and the reaction temperature is less than 30 ℃.
In general, the polycrystalline phase composite material of the lithium ion battery and the pulping method thereof provided by the invention are prepared by adding raw materials in steps through a double planetary mixer and performing high-temperature dispersion and flocculation, specifically, the polycrystalline phase composite material and the adhesive are mixed and wet, then the solvent and the conductive agent are added for dispersion, and then the solvent is added for slurry concentration adjustment, so that the stirring and dispersing process for adhesive preparation in the prior art is omitted, the operation steps are simplified, the problem of generating agglomerate particles in a dry powder prefabrication mixing process is avoided, the risk that the surface coating layer of the material particles is damaged to different degrees due to high-speed shearing force in a dry mixing and wet mixing process of the polycrystalline phase composite material is avoided, and the flexibility and the efficiency of the anode multiphase composite material of the lithium ion battery in the pulping process are improved.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (8)

1. A pulping method of lithium ion battery electrode materials, which is characterized by comprising the following steps:
step S01, adding 94% -96% of electrode material and 1.8% -2.2% of adhesive into a double planetary mixer for mixing, mixing for 10-20 min by a revolution mixing rod under the condition of 5-10 HZ, mixing for 10-20 min by a revolution mixing rod under the condition of 10-15 HZ, and reacting at the temperature of less than 30 ℃, wherein the electrode material is lithium ion positive electrode material or negative electrode active material, and the adhesive is a composite adhesive formed by any one or more of polyvinyl alcohol, polytetrafluoroethylene, polyvinylidene fluoride, styrene-butadiene rubber, fluorinated rubber, polyurethane and polyacrylonitrile copolymer;
s02, adding a solvent and 1% -3% of a conductive agent, carrying out revolution stirring and autorotation stirring by using the double-planetary stirrer, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 20-30 HZ, the autorotation frequency is 20-30 HZ, the stirring time is 1-2 h, and the reaction temperature is less than 30 ℃, wherein the solvent is deionized water and/or N-methylpyrrolidone, and the conductive agent is a composite conductive agent consisting of conductive carbon black and carbon nano tubes;
and S03, adding the solvent to adjust the consistency of the slurry, and continuing stirring, wherein the vacuum degree in the stirring process is-0.090 Mpa-0.095Mpa, the revolution frequency is 20-30 HZ, the rotation frequency is 20-30 HZ, the stirring time is 1-2 h, and the reaction temperature is less than 30 ℃.
2. The method for pulping a lithium ion battery electrode material according to claim 1, wherein the lithium ion cathode material is a mixture of any one or more of lithium cobaltate, lithium manganate, lithium nickel cobalt aluminate, lithium iron phosphate and lithium iron manganese phosphate.
3. The method for pulping a lithium ion battery electrode material according to claim 1, wherein the negative electrode active material is a mixture of any one or more of natural graphite, artificial graphite, composite graphite, silicon carbon negative electrode, and lithium titanate.
4. The method for pulping the electrode material of the lithium ion battery according to claim 1, wherein in the step S01, 94 to 96 weight percent of the electrode material and 1.8 to 2.2 weight percent of polyvinylidene fluoride are added into a double planetary mixer for stirring; in the step S02, 80 percent of N-methyl pyrrolidone and 1 to 3 percent of conductive carbon black and/or carbon nano tubes by weight percent are added; and S03, adding 20% of N-methyl pyrrolidone to adjust the consistency of the slurry, and continuing stirring.
5. The lithium ion battery electrode material is characterized by being prepared by the pulping method of the lithium ion battery electrode material according to any one of claims 1-3, and comprises the following components in percentage by weight: 94% -96% of electrode material, 1.8% -2.2% of adhesive and 1% -3% of conductive agent.
6. The lithium ion battery electrode material according to claim 5, wherein the adhesive is polyvinylidene fluoride, the conductive agent is a composite conductive agent composed of conductive carbon black and carbon nanotubes, the solvent is N-methyl pyrrolidone, and the lithium ion battery electrode material comprises the following components in percentage by weight: 94.8% of electrode material, 2.2% of polyvinylidene fluoride, 2.2% of conductive carbon black and 0.8% of carbon nanotubes.
7. The lithium ion battery electrode material according to claim 5, wherein the adhesive is polyvinylidene fluoride, the conductive agent is a composite conductive agent composed of conductive carbon black and carbon nanotubes, the solvent is N-methyl pyrrolidone, and the lithium ion battery electrode material comprises the following components in percentage by weight: 95.5% of electrode material, 2.0% of polyvinylidene fluoride, 1% of conductive carbon black and 1.5% of carbon nano-tubes.
8. The lithium ion battery electrode material according to claim 5, wherein the adhesive is polyvinylidene fluoride, the conductive agent is carbon nanotubes, the solvent is N-methyl pyrrolidone, and the lithium ion battery electrode material comprises the following components in percentage by weight: 96% of electrode material, 2.0% of polyvinylidene fluoride and 2.0% of carbon nano tubes.
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