CN107819108B - Ternary electrode slurry, ternary electrode plate and preparation method - Google Patents

Ternary electrode slurry, ternary electrode plate and preparation method Download PDF

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CN107819108B
CN107819108B CN201711076914.6A CN201711076914A CN107819108B CN 107819108 B CN107819108 B CN 107819108B CN 201711076914 A CN201711076914 A CN 201711076914A CN 107819108 B CN107819108 B CN 107819108B
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ternary
ternary electrode
nickel
electrode slurry
conductive agent
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CN107819108A (en
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张前
吴宇
喻洋
黄俊杰
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Guizhou Tongren Hds New Energy Co ltd
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Guizhou Tongren Hds New Energy 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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
    • H01M4/624—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

Abstract

The invention provides ternary electrode slurry, a ternary electrode plate and a preparation method, relates to the technical field of electrode plates, and is mainly prepared from the following raw materials: the nickel cobalt lithium manganate ternary material, the conductive agent, the water-based adhesive and the nickel dissolution inhibitor relieve the problem that a nickel component is easy to react with water and form [ Ni (H) through complexation when the water-based nickel cobalt lithium manganate ternary material slurry is prepared in the prior art2O)6]2+Or hydrolyzed to form Ni (OH)2And Ni (OH)3The technical problem that nickel ions are consumed is solved, water is used as a solvent, environmental pollution is reduced, energy is saved, and the processing cost of the battery is reduced, and the technical effects that the reaction of nickel in an aqueous solution is inhibited, the consumption of the nickel ions is reduced, and the performance of the electrode slurry is ensured are achieved by adding a nickel dissolution inhibitor into the ternary electrode slurry.

Description

Ternary electrode slurry, ternary electrode plate and preparation method
Technical Field
The invention relates to the technical field of electrode plates, in particular to ternary electrode slurry, a ternary electrode plate and a preparation method.
Background
The situation of traditional energy sources such as crude oil and coal is increasingly tense, and people are actively searching for novel energy sources which can replace the impossible renewable resources. Lithium ion batteries are the focus of attention because of their high energy density, environmental protection and no pollution.
In a novel lithium ion battery, nickel cobalt lithium manganate ternary material is widely concerned by virtue of high capacity, good thermal stability, wide charge-discharge voltage and other excellent electrochemical properties. At present, in the process of preparing the nickel cobalt lithium manganate positive electrode material, an organic solvent is mostly adopted, but the organic solvent is extremely volatile in the pulping process, a large amount of gas is discharged into the air, the environment is polluted, and meanwhile, the organic solvent has high cost and high processing energy consumption, so that the processing cost of the battery is high.
Recently, deionized water is replaced by some enterprises as a solvent, but nickel in the nickel cobalt lithium manganate ternary material is easy to react with water and form [ Ni (H) through complexation2O)6]2+Or hydrolyzed to form Ni (OH)2And Ni (OH)3Causing the consumption of nickel ions, which affects the performance of the electrode slurry.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
One of the objectives of the present invention is to provide a ternary electrode slurry to reduce the possibility that the nickel component is easily reacted with water and complexed to form [ Ni (H) when the aqueous nickel cobalt lithium manganate ternary material slurry is prepared2O)6]2+Or hydrolyzed to form Ni (OH)2And Ni (OH)3Leading to the technical problem that nickel ions are consumed.
The ternary electrode slurry provided by the invention is mainly prepared from the following raw materials: the nickel cobalt lithium manganate composite material comprises a nickel cobalt lithium manganate ternary material, a conductive agent, a water-based adhesive and a nickel dissolution inhibitor.
Further, the mass ratio of the nickel cobalt lithium manganate ternary material to the conductive agent to the aqueous binder to the nickel dissolution inhibitor is (90-110): (5-15): (2-10): (0.2-1), preferably (95-105): (8-12): (4-8): (0.2-1), more preferably (95-100): (9-11): (5-7): (0.2-1).
Further, the nickel dissolution inhibitor is selected from one of hydrochloric acid, sulfuric acid, acetic acid and benzoic acid, preferably hydrochloric acid and/or sulfuric acid, and more preferably hydrochloric acid.
Further, the conductive agent is selected from at least one of graphite, carbon black, acetylene black, graphene, carbon fibers and carbon nanotubes, preferably graphite and/or carbon black, and more preferably a mixture of graphite and carbon black.
Further, the aqueous adhesive is at least one selected from the group consisting of an acrylic aqueous adhesive, a polyvinyl alcohol aqueous adhesive, a polyurethane aqueous adhesive, an epoxy aqueous adhesive, a phenol aqueous adhesive and a silicone aqueous adhesive, preferably an acrylic aqueous adhesive, and more preferably acrylic modified chitosan.
The second purpose of the invention is to provide a preparation method of the ternary electrode slurry, and the preparation method of the ternary electrode slurry provided by the invention is to dissolve the nickel cobalt lithium manganate ternary material, the conductive agent, the water-based adhesive and the nickel dissolution inhibitor in water and uniformly mix the materials to obtain the ternary electrode slurry.
Furthermore, the viscosity of the ternary electrode slurry is 3000-5000mpa.s, and the pH value is 8-10.
Further, uniformly mixing the nickel cobalt lithium manganate ternary material and a conductive agent, then adding a water-based adhesive and water, uniformly mixing, finally adding a nickel dissolution inhibitor, and uniformly mixing to prepare the ternary electrode slurry.
The invention also aims to provide a ternary electrode slice which is mainly prepared from ternary electrode slurry and a base material, wherein the base material is selected from one of aluminum foil, copper foil, stainless steel foil and iron foil, and is preferably aluminum foil.
The fourth purpose of the invention is to provide a preparation method of the ternary electrode slice, which comprises the following steps: coating the ternary electrode slurry on a base material, and then baking, rolling and slitting to obtain the ternary electrode slice.
The ternary electrode slurry provided by the invention takes water as a solvent, so that the environmental pollution is reduced, the energy is saved, the processing cost of the battery is reduced, and the nickel dissolution inhibitor is added into the ternary electrode slurry to inhibit the reaction of nickel in an aqueous solution, reduce the consumption of nickel ions and ensure the performance of the electrode slurry.
The preparation method of the ternary electrode slurry provided by the invention is simple in process, convenient to operate, suitable for large-scale industrial production and capable of saving a large amount of manpower and material resources.
According to the ternary electrode plate provided by the invention, the ternary electrode slurry provided by the invention is coated on the base material, so that the environmental pollution is reduced, the energy is saved, the processing cost of the battery is reduced, the reaction of nickel in an aqueous solution is inhibited by adding the nickel dissolution inhibitor into the ternary electrode slurry, the consumption of nickel ions is reduced, and the performance of the ternary electrode plate is ensured.
The preparation method of the ternary electrode plate provided by the invention is simple in process, convenient to operate, suitable for large-scale industrial production and capable of saving a large amount of manpower and material resources.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a discharge rate test chart of the ternary electrode sheet provided in example 16 of the present invention and comparative examples 3 to 4;
fig. 2 is a life cycle test chart of the ternary electrode sheet provided in example 16;
fig. 3 is a life cycle test chart of the ternary electrode sheet provided in comparative example 3;
fig. 4 is a life cycle test chart of the ternary electrode sheet provided in comparative example 4.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to a first aspect of the invention, the invention provides ternary electrode paste which is mainly prepared from the following raw materials: the nickel cobalt lithium manganate composite material comprises a nickel cobalt lithium manganate ternary material, a conductive agent, a water-based adhesive and a nickel dissolution inhibitor.
The ternary electrode slurry provided by the invention takes water as a solvent, so that the environmental pollution is reduced, the energy is saved, the processing cost of the battery is reduced, and the nickel dissolution inhibitor is added into the ternary electrode slurry to inhibit the reaction of nickel in an aqueous solution, reduce the consumption of nickel ions and ensure the performance of the electrode slurry.
In a preferred embodiment of the invention, the mass ratio of the nickel cobalt lithium manganate ternary material, the conductive agent, the aqueous binder and the nickel dissolution inhibitor is (70-90): (5-15): (2-10): (0.2-1), preferably (75-85): (8-12): (4-8): (0.2-1), more preferably (78-82): (9-11): (5-7): (0.2-1).
In the invention, the nickel cobalt lithium manganate ternary material is black solid powder, has good fluidity and no caking, is one of key materials of ternary electrode slurry, and can be purchased from China fir battery materials Co., Ltd, Ningbo gold and new materials Co., Ltd or Beijing Dangshi materials science and technology Co., Ltd.
The nickel dissolution inhibitor has the function of being reacted with [ Ni (H)2O)6]2+、Ni(OH)2And Ni (OH)3And reacting to generate nickel ions so as to inhibit the dissolution of the nickel component, thereby ensuring the performance of the ternary electrode slurry.
In the preferred embodiment of the invention, water is used as the solvent to avoid the volatilization of organic substances in the process of preparing the ternary electrode slurry, thereby causing environmental pollution, and meanwhile, the water is used as the solvent to replace the organic solvent, thereby being capable of reducing the processing cost of the ternary electrode slurry.
In the preferred embodiment of the invention, the mass ratio of the nickel cobalt lithium manganate ternary material, the conductive agent, the aqueous binder and the nickel dissolution inhibitor is (70-90): (5-15): (2-10): (0.2-1), preferably (75-85): (8-12): (4-8): (0.2-1), more preferably (78-82): (9-11): (5-7): (0.2-1).
The preparation method comprises the following steps of mixing a nickel cobalt lithium manganate ternary material, a conductive agent, an aqueous binder and a nickel dissolution inhibitor in a ratio of (70-90): (5-15): (2-10): (0.2-1) the mass ratio range is cooperated, so that the performance of the ternary electrode slurry is excellent, and particularly when the mass ratio of the four is (75-85): (8-12): (4-8): (0.2-1), the capacity of the prepared three-electrode plate is higher, the thermal stability is better, and when the mass ratio of the four is (78-82): (9-11): (5-7): (0.2-1), the performance of the prepared ternary electrode slice is more excellent.
In a preferred embodiment of the present invention, the nickel dissolution inhibitor is selected from one of hydrochloric acid, sulfuric acid, acetic acid and benzoic acid, preferably hydrochloric acid and/or sulfuric acid, more preferably hydrochloric acid.
In a typical but non-limiting embodiment of the invention, the nickel dissolution inhibitor is an acidic materialAcidic substances capable of reacting with [ Ni (H)2O)6]2+、Ni(OH)2And Ni (OH)3Reacting to generate nickel ions to inhibit the dissolution of nickel components, thereby ensuring the performance of the ternary electrode slurry; when the nickel dissolution inhibitor is hydrochloric acid and/or sulfuric acid, it is more likely to react with [ Ni (H)2O)6]2+、Ni(OH)2And Ni (OH)3The reaction occurs, the dissolution inhibiting effect on the nickel component is good, and particularly when the nickel dissolution inhibitor is hydrochloric acid, the dissolution inhibiting effect on the nickel component is better.
In a preferred embodiment of the present invention, the conductive agent is selected from at least one of graphite, carbon black, acetylene black, graphene, carbon fiber, and carbon nanotube, preferably graphite and/or carbon black, more preferably a mixture of graphite and carbon black.
The conductive agent is used for ensuring that the electrode has good charge and discharge performance, a certain amount of conductive substances are added during the manufacturing of the pole piece, and the effect of collecting micro-current is achieved among the active substances and between the active substances and the current collector, so that the migration rate in the electrode material is improved, and the charge and discharge efficiency of the electrode is improved.
When the conductive agent is graphite and/or carbon black, the conductive agent is more easily dispersed in an aqueous solvent to form uniform and stable ternary electrode slurry, and the performance of the prepared ternary electrode plate is excellent, particularly when the conductive agent is a mixture of graphite and carbon black, the performance of the prepared ternary electrode plate is better.
In a preferred embodiment of the present invention, the aqueous adhesive is at least one selected from the group consisting of an acrylic aqueous adhesive, a polyvinyl alcohol aqueous adhesive, a polyurethane aqueous adhesive, an epoxy aqueous adhesive, a phenol aqueous adhesive and a silicone aqueous adhesive, preferably an acrylic aqueous adhesive, and more preferably acrylic modified chitosan.
In the present invention, an aqueous binder is used to adhere the ternary electrode paste to a substrate to form a ternary electrode sheet. In the preferred embodiment of the invention, the aqueous adhesive is safer, more environment-friendly, less polluting to the environment, lower in cost and simpler and more convenient to operate.
When the aqueous adhesive is any one of acrylic aqueous adhesive, polyvinyl alcohol aqueous adhesive, polyurethane aqueous adhesive, epoxy aqueous adhesive, phenolic aldehyde aqueous adhesive and organosilicon aqueous adhesive, the ternary electrode paste can be adhered to a substrate, when the acrylic aqueous adhesive is selected, the ternary electrode paste has excellent dispersion performance in an aqueous solution and good adhesion performance, and particularly when the acrylic modified chitosan is selected as the adhesive, the ternary electrode paste is pollution-free and environment-friendly, has better synergistic effect with other raw materials in the ternary electrode paste, and ensures that the ternary electrode paste has better adhesion effect with the substrate.
According to a second aspect of the present invention, there is provided a method for preparing the above-mentioned ternary electrode paste, comprising the steps of:
dissolving the nickel cobalt lithium manganate ternary material, a conductive agent, a water-based adhesive and a nickel dissolution inhibitor in water, and uniformly mixing to obtain the ternary electrode slurry.
The preparation method of the ternary electrode slurry provided by the invention is simple in process, convenient to operate, suitable for large-scale industrial production and capable of saving a large amount of manpower and material resources.
In a preferred embodiment of the invention, the viscosity of the ternary electrode slurry is 3000-.
By controlling the viscosity of the ternary electrode slurry to be 3000-.
In a preferred embodiment of the invention, in the preparation process of the ternary electrode slurry, the nickel cobalt lithium manganate ternary material and the conductive agent are uniformly mixed, then water and the water-based binder are added and uniformly mixed, and finally the nickel dissolution inhibitor is added and uniformly mixed to prepare the ternary electrode slurry.
In a typical but non-limiting preparation method of the ternary electrode slurry, firstly, a nickel cobalt lithium manganate ternary material and a conductive agent are mixed, dry mixing is carried out for 0.5-1h, then water and a water-based adhesive are added into the mixture of the nickel cobalt lithium manganate ternary material and the conductive agent, stirring is carried out for 1.5-2h in a mud shape, then the rest water is added, stirring is carried out for 0.5h, and then a nickel dissolution inhibitor is added into the solvent, thus obtaining the ternary electrode slurry.
According to a third aspect of the invention, the invention provides a ternary electrode sheet, which is mainly prepared from ternary electrode slurry and a base material, wherein the base material is selected from one of aluminum foil, copper foil, stainless steel foil and iron foil, and is preferably aluminum foil.
The ternary electrode plate provided by the invention is prepared by coating the water-based ternary electrode slurry on a base material, so that the environmental pollution is reduced, the cost of the ternary electrode plate is reduced, and the performance of the ternary electrode plate is ensured.
The fourth aspect of the invention provides a preparation method of the ternary electrode slice, which comprises the following steps: coating the ternary electrode slurry on a base material, baking, rolling and slitting to obtain the ternary electrode slice, wherein the baking temperature is preferably 40-85 ℃.
The preparation method of the ternary electrode plate provided by the invention is simple in process, convenient to operate, suitable for large-scale industrial production and capable of saving a large amount of manpower and material resources.
According to the preparation method of the ternary electrode slice, when the ternary electrode slice is baked after coating, the baking temperature is controlled to be 40-85 ℃, and the organic solvent can be evaporated only when the ternary electrode slurry adopting the organic solvent as the solvent is heated to 95-120 ℃ in the prior art, so that the preparation method of the ternary electrode slice is more energy-saving and more environment-friendly, and the power consumption is saved by 30-50%.
The technical solution provided by the present invention is further described below with reference to examples and comparative examples.
Example 1
The embodiment provides a ternary electrode slurry which is mainly prepared from the following raw materials in parts by mass: 90 parts of nickel cobalt lithium manganate ternary material, 15 parts of graphite, 2 parts of acrylic acid modified chitosan and 0.3 part of hydrochloric acid.
Example 2
The embodiment provides a ternary electrode slurry which is mainly prepared from the following raw materials in parts by mass: 110 parts of nickel cobalt lithium manganate ternary material, 5 parts of carbon nano tube, 10 parts of acrylic acid modified chitosan and 1 part of benzoic acid.
Example 3
The embodiment provides a ternary electrode slurry which is mainly prepared from the following raw materials in parts by mass: 95 parts of nickel cobalt lithium manganate ternary material, 8 parts of carbon fiber, 4 parts of acrylic acid modified chitosan and 0.4 part of sulfuric acid.
Example 4
The embodiment provides a ternary electrode slurry which is mainly prepared from the following raw materials in parts by mass: 105 parts of nickel cobalt lithium manganate ternary material, 12 parts of acetylene black, 8 parts of acrylic acid modified chitosan and 0.8 part of acetic acid.
Example 5
The embodiment provides a ternary electrode slurry which is mainly prepared from the following raw materials in parts by mass: 100 parts of nickel cobalt lithium manganate ternary material, 5 parts of graphene, 5 parts of acrylic acid modified chitosan and 0.5 part of hydrochloric acid.
Example 6
The embodiment provides a ternary electrode slurry which is mainly prepared from the following raw materials in parts by mass: 98 parts of nickel cobalt lithium manganate ternary material, 6 parts of graphite, 5 parts of carbon black, 7 parts of acrylic acid modified chitosan and 0.7 part of hydrochloric acid.
Example 7
The embodiment provides a ternary electrode slurry which is mainly prepared from the following raw materials in parts by mass: 96 parts of nickel cobalt lithium manganate ternary material, 5 parts of graphite, 5 parts of carbon black, 6 parts of acrylic acid modified chitosan and 0.6 part of hydrochloric acid.
Example 8
The embodiment provides a ternary electrode slurry which is mainly prepared from the following raw materials in parts by mass: 96 parts of nickel cobalt lithium manganate ternary material, 1 part of graphite, 2 parts of carbon black, 15 parts of acrylic acid modified chitosan and 1.5 parts of hydrochloric acid.
Example 9
The embodiment provides a ternary electrode slurry which is mainly prepared from the following raw materials in parts by mass: 96 parts of nickel cobalt lithium manganate ternary material, 10 parts of graphite, 10 parts of carbon black, 3 parts of acrylic acid modified chitosan and 0.1 part of hydrochloric acid.
The ternary electrode paste provided in examples 1-9 above was prepared as follows:
firstly, mixing the nickel cobalt lithium manganate ternary material and a conductive agent, dry-mixing for 0.5-1h, adding water and acrylic acid modified chitosan into the mixture of the nickel cobalt lithium manganate ternary material and the conductive agent, stirring for 1.5-2h in a mud state, adding the balance of water, stirring for 0.5h, adding a nickel dissolution inhibitor into the solvent, and adjusting the viscosity to 3000-plus-5000 mpa.s to obtain the ternary electrode slurry.
Comparative example 1
The comparative example provides an oil-based ternary electrode slurry, and is different from example 7 in that methyl pyrrolidone is used as a solvent instead of water, and polyvinylidene fluoride is used as a binder instead of acrylic acid-modified chitosan.
Comparative example 2
This comparative example, which differs from example 7 in that no nickel dissolution inhibitor was added, provides a ternary electrode paste.
The preparation method of the ternary electrode paste provided in comparative examples 1-2 above is the same as that of example 7, and is not described herein again.
Examples 10 to 18
Examples 10-18 each provide a ternary electrode sheet prepared from the ternary electrode slurry provided in examples 1-9 and aluminum foil, respectively.
The ternary electrode sheets provided in examples 10-18 were all prepared as follows:
coating the ternary electrode slurry on an aluminum foil, baking and drying at 40-85 ℃ by using an oven, and rolling and slitting to obtain the ternary electrode slice.
Comparative examples 3 to 4
Comparative examples 3 to 4 each provide a ternary electrode sheet prepared by coating the ternary electrode slurry provided in comparative examples 1 to 2 on an aluminum foil.
The preparation method of the ternary electrode sheet provided in comparative example 3 is different from that of the ternary electrode sheet provided in example 14 in that the baking temperature is 90-120 ℃.
The preparation method of the ternary electrode sheet provided in comparative example 4 is the same as that of the ternary electrode sheet provided in example 14, and details are not repeated here.
Test example 1
The ternary electrode sheets provided in the above examples 10 to 18 and comparative examples 3 to 4 were subjected to capacitance and internal resistance measurements, and the results are shown in the following table:
TABLE 1 ternary electrode slice capacitance and internal resistance performance data sheet
Gram capacity (mAh/g) Internal resistance (m omega)
Example 10 155.02 16.6
Example 11 155.13 16.5
Example 12 155.37 16.5
Example 13 155.42 16.4
Example 14 155.58 16.4
Example 15 155.61 16.3
Example 16 155.77 16.2
Example 17 153.86 16.6
Example 18 154.21 16.6
Comparative example 3 155.99 16.6
Comparative example 4 152.36 17.1
As can be seen from table 1, the gram capacity of the ternary electrode sheets prepared from the aqueous ternary electrode slurry provided in examples 10 to 16 exceeds 155mAh/g, the internal resistance is not higher than 16.6m Ω, and the performance of the ternary electrode sheets prepared from the ternary electrode slurry using the organic solvent as the solvent provided in comparative example 3 is basically consistent, and meanwhile, the slurries used in the ternary electrode sheets provided in examples 10 to 16 all use water as the solvent, so that the environmental pollution is reduced, the energy is saved, and the processing cost of the battery is reduced.
From the comparison between example 16 and comparative example 4, it can be seen that the nickel dissolution inhibitor is added into the ternary electrode slurry, so that the reaction of nickel in the aqueous solution can be remarkably inhibited, the consumption of nickel ions is reduced, and the performance of the electrode slurry is ensured.
As can be seen from the comparison of examples 10 to 16 with examples 17 to 18, when the mass ratio of the nickel cobalt lithium manganate ternary material, the conductive agent, the aqueous binder and the nickel dissolution inhibitor in the ternary electrode slurry is (70 to 90): (5-15): (2-10): (0.2-1), the ternary electrode slice prepared from the prepared ternary electrode slurry has larger capacitance, smaller internal resistance and more excellent comprehensive performance.
Test example 2
The discharge rate of the ternary electrode sheet provided in example 16 and the discharge rate of the ternary electrode sheet provided in comparative examples 3 to 4 are tested, and the test result is shown in fig. 1, and it can be seen from fig. 1 that the discharge rate of the ternary electrode sheet provided in example 16 is substantially the same as the discharge rate of the ternary electrode sheet provided in comparative example 3, and is significantly higher than the discharge rate of the ternary electrode sheet prepared from the aqueous ternary electrode slurry provided in comparative example 4, which indicates that the discharge rate of the ternary electrode slurry provided by the present invention and using water as a solvent is equivalent to the discharge rate of the conventional oil-based ternary electrode slurry and using methyl pyrrolidone as a solvent, and is significantly higher than the discharge rate of the aqueous ternary electrode slurry and not adding a nickel dissolution inhibitor.
Test example 3
Life cycle tests are carried out on the ternary electrode sheet provided in the example 16 and the ternary electrode sheets provided in the comparative examples 3-4, and the test results are shown in fig. 2-4, fig. 2 is a life cycle test chart of the ternary electrode sheet provided in the example 16, and fig. 3 is a life cycle test chart of the ternary electrode sheet provided in the comparative example 3; fig. 4 is a life cycle test chart of the ternary electrode sheet provided in comparative example 4, and as can be seen from fig. 2 to 4, the ternary electrode sheet provided in example 16 circulates 220 times, the capacitance remains 98.12%, the ternary electrode sheet provided in comparative example 3 circulates 220 times, the capacitance remains 98.15%, the ternary electrode sheet provided in comparative example 4 circulates 220 times, and the capacitance remains 96.22%, which indicates that the life of the ternary electrode slurry with water as a solvent provided by the present invention is equivalent to the life of the conventional oil-based ternary electrode slurry with methyl pyrrolidone as a solvent, and is significantly higher than that of the water-based ternary electrode slurry without the nickel dissolution inhibitor.
In addition, statistics of power loss shows that the power consumed by the ternary electrode sheet provided in example 16 in the baking process is reduced by 35% compared with the power consumed by the ternary electrode sheet provided in comparative example 3 in the baking process, which indicates that the ternary electrode sheet using water as a solvent provided by the present invention is more energy-saving and more environment-friendly in the preparation process.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. The ternary electrode slurry is characterized by being mainly prepared from the following raw materials: the lithium nickel cobalt manganese oxide ternary material comprises a nickel cobalt lithium manganese oxide ternary material, a conductive agent, a water-based adhesive and a nickel dissolution inhibitor; the mass ratio of the nickel cobalt lithium manganate ternary material to the conductive agent to the aqueous binder to the nickel dissolution inhibitor is (95-100): (9-11): (5-7): (0.2-1); the nickel dissolution inhibitor is hydrochloric acid; the aqueous adhesive is acrylic acid modified chitosan; the preparation method of the ternary electrode slurry comprises the following steps: dissolving a nickel cobalt lithium manganate ternary material, a conductive agent, a water-based adhesive and a nickel dissolution inhibitor in water, and uniformly mixing to obtain ternary electrode slurry; the viscosity of the ternary electrode slurry is 3000-5000mpa.s, and the pH value is 8-10.
2. The ternary electrode paste according to claim 1, wherein the conductive agent is selected from at least one of graphite, carbon black, acetylene black, graphene, carbon fiber, and carbon nanotube.
3. The ternary electrode paste according to claim 1, wherein the conductive agent is graphite and/or carbon black.
4. The ternary electrode paste according to claim 1, wherein the conductive agent is a mixture of graphite and carbon black.
5. The ternary electrode paste according to claim 1, wherein the ternary electrode paste is prepared by uniformly mixing the nickel cobalt lithium manganate ternary material and the conductive agent, adding water and the aqueous binder, uniformly mixing, and finally adding the nickel dissolution inhibitor, and uniformly mixing.
6. A ternary electrode sheet, characterized in that, the ternary electrode slurry of any claim 1-5 and a substrate are prepared, wherein the substrate is selected from one of aluminum foil, copper foil, stainless steel foil and iron foil.
7. The ternary electrode sheet according to claim 6, wherein the substrate is aluminum foil.
8. The preparation method of the ternary electrode sheet according to claim 6 or 7, characterized by comprising the following steps: coating the ternary electrode slurry on a base material, and then baking, rolling and slitting to obtain the ternary electrode slice.
9. The method for preparing a ternary electrode sheet according to claim 8, wherein the baking temperature is 40-85 ℃.
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