CN109546091B - Preparation method of high-specific-energy zinc-nickel battery positive electrode - Google Patents

Preparation method of high-specific-energy zinc-nickel battery positive electrode Download PDF

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CN109546091B
CN109546091B CN201811320027.3A CN201811320027A CN109546091B CN 109546091 B CN109546091 B CN 109546091B CN 201811320027 A CN201811320027 A CN 201811320027A CN 109546091 B CN109546091 B CN 109546091B
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positive electrode
nickel
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CN109546091A (en
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柯娃
吴亮
朱军平
马永泉
刘孝伟
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Chaowei Power Group 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
    • H01M4/24—Electrodes for alkaline accumulators
    • H01M4/26—Processes of manufacture
    • H01M4/28—Precipitating active material on the carrier
    • 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
    • H01M10/24—Alkaline accumulators
    • H01M10/30—Nickel accumulators
    • 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
    • H01M4/362—Composites
    • H01M4/364—Composites as mixtures
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/523—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron for non-aqueous cells
    • 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
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • 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 belongs to the technical field of zinc-nickel batteries. The invention discloses a preparation method of a high specific energy zinc-nickel battery anode, which comprises the steps of adding a thickening agent into a raw material A, uniformly mixing to prepare a slurry A, dissolving a divalent nickel compound into water to prepare an aqueous solution, adding the slurry A and a surfactant, stirring to prepare a slurry B, adding polytetrafluoroethylene into the slurry B to prepare an anode slurry, putting an anode substrate into the anode slurry until the anode substrate is completely submerged, taking out the anode substrate after standing for a period of time to prepare a battery anode plate, and carrying out post-treatment to prepare the high specific energy zinc-nickel battery anode. The invention can solve the problem of untight combination between the positive active substances of the high-specific-energy zinc-nickel battery, reduce the softening and falling of the positive active substances, reduce the internal resistance, improve the utilization rate of the active substances, improve the charge acceptance of the electrode, improve the battery capacity, prolong the cycle service life and the charge-discharge conversion efficiency, and avoid the early attenuation of the battery capacity.

Description

Preparation method of high-specific-energy zinc-nickel battery positive electrode
Technical Field
The invention relates to the technical field of zinc-nickel batteries, in particular to a preparation method of a high-specific-energy zinc-nickel battery anode.
Background
In 1859, the french physicist Gaston platform invented a lead-acid battery, which was driven by the development of the automobile, traffic and communication industries, and the capacity of the lead-acid battery was developed rapidly, so that it was widely used in national economy and people's lives because of its characteristics of high safety, stable performance, low manufacturing cost and high recycling value.
With the development and progress of science and technology and the increase of the contribution proportion of electric vehicles to vehicle driving, the demand on battery energy is greatly improved, particularly, the fully-hybrid and plug-in hybrid vehicles provide a stricter standard for the energy of batteries, and lead-acid storage batteries have a series of problems of low energy density utilization rate, incomplete active material conversion, capacity attenuation and the like, and become the largest restriction factor entering the electric vehicle market.
The new high specific energy zinc-nickel battery has the obvious advantages of high working voltage, high energy density, no environmental pollution, high safety index, low production cost and the like, and is a secondary battery capable of being recycled. However, the limited cycle times are the biggest obstacles for the development of high specific energy zinc-nickel batteries.
The main reasons for the defects of the high specific energy zinc-nickel battery are as follows, 1, the electrode of the high specific energy zinc-nickel battery is prepared by using Ni (OH)2The active substance and the conductive agent are not in tight contact because the active substance and the conductive agent are physically mixed together, and electrons cannot be rapidly transferred from the active substance to a current collector during charging and discharging, so that the internal resistance is high, the utilization rate of the active substance is low, and the low energy density and the low stability are caused; 2. the design of the high-specific energy zinc-nickel battery adopts the mode that the tabs are welded on the current collecting base body and then connected, and the problems are that the current distribution is uneven, the current density of the positions with the tabs is large, and the current density of the positions far away from the tabs is small, so that the deformation of pole pieces is caused in the recycling process, the short circuit is caused, and the cycle life of the battery is shortened.
Disclosure of Invention
In order to solve the problems of the prior art that the active material of the high-specific-energy iron battery is not tightly combined with a matrix, the utilization rate of the active material is low, the stability is poor, the current distribution of the battery is not uniform and the like, the invention provides the preparation method of the high-specific-energy zinc-nickel battery anode, which can improve the cycle life and the charge-discharge conversion efficiency of the high-specific-energy zinc-nickel battery and avoid the early attenuation of the battery capacity.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a high specific energy zinc-nickel battery positive electrode comprises the following steps:
a) uniformly mixing the raw material A with a thickening agent to prepare slurry A, wherein the raw material A consists of an active substance material and a conductive agent;
b) dissolving nickel salt in water to prepare 0.1-1 mol/L nickel salt solution, stirring for 3-10 minutes, adding a surfactant accounting for 0.2-0.5 wt% of the weight of the slurry A and the nickel salt solution, and continuously stirring for 5-15 minutes to prepare slurry B;
c) adding polytetrafluoroethylene into the slurry B, and stirring at a high speed for 1-3 hours to prepare anode slurry;
d) placing the positive electrode substrate into the positive electrode slurry until the positive electrode substrate is completely submerged, and taking out the positive electrode substrate after the positive electrode substrate is placed for a period of time to obtain a battery positive plate;
e) and post-treating to obtain the high specific energy zinc-nickel battery anode.
The organic polymer conductive agent is added into the nickel hydroxide, so that the conductivity among active substances can be effectively improved, and the performance of the battery is not influenced.
Preferably, the thickener is one of methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose or hydroxyethyl cellulose, and the active material is Ni (OH)2Or Ni (OH)2In one of the composite materials, the conductive agent is at least one of polyacetylene, polythiophene, polypyrrole or polyaniline.
Preferably, in the step a), the weight ratio of the conductive agent to the active substance is (0.8-2): (85-150), and the addition amount of the thickening agent is 0.5-1.2 wt% of the total weight of the conductive agent and the active substance.
Preferably, in step b), the weight ratio of the slurry a to the nickel salt solution is 2:1 to 1.5.
Preferably, in the step b), the surfactant is a naphthalenesulfonic acid formaldehyde condensate, and the stirring speed is 600-800 rpm.
The naphthalene sulfonic acid formaldehyde condensate is an additive with surface activity, which is prepared by modifying a naphthalene sulfonic acid formaldehyde condensate formed by condensing naphthalene sulfonic acid and formaldehyde, is a compound with a long-chain structure and has a larger hydrophobic group. The surfactant naphthalene sulfonic acid formaldehyde condensate can modify hydrophilic groups on the surface of the nickel salt and enhance the connection between the active substance and the additive. The unique long-chain structure of the surfactant naphthalene sulfonic acid formaldehyde condensate is beneficial to coating particles and is beneficial to the mixing effect between an active substance and an additive. Meanwhile, the organic high molecular polymer dispersant has strong stability under the conditions of high temperature and low temperature, the highly dispersed additive can be uniformly distributed in the active substance of the polar plate, the current transmission between the active substance and the grid is effectively improved, the formed porous structure can improve the specific surface area of the active substance of the negative electrode, promote the electrolyte to diffuse from the surface to the inside, reduce the obstruction of large particles to the electron conduction, further prolong the service life of the deep circulation of the battery and improve the specific energy of the battery.
Preferably, in step c), the ratio of the addition amount of polytetrafluoroethylene to the weight of the slurry B is (0.5 to 3): (80-180) the reaction temperature is 40-70 ℃, and cooling to room temperature after reaction.
Preferably, in step c), the slurry B is charged into an autoclave containing polytetrafluoroethylene and then treated.
The slurry is put into a polytetrafluoroethylene-containing autoclave, so that the polytetrafluoroethylene can be ensured to be fully contacted with active substances, and the binding force of the active substances is improved.
The binder polytetrafluoroethylene emulsion is matched with thickeners such as methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose or hydroxyethyl cellulose, so that the positive active material can keep proper viscosity when being made into slurry, the combination firmness of the positive active material on a substrate is improved, the polytetrafluoroethylene can also reduce softening and falling of the active material caused by volume expansion and contraction in the charging and discharging processes, namely, the binding force between the active material and a grid is enhanced, and the mechanical strength of the positive plate is improved.
Preferably, the viscosity of the prepared positive electrode slurry in the step c) is 5000-18000 mpas.
Preferably, in the step e), the post-treatment is carried out after the prepared battery positive plate is clamped, and then the tabletting operation is carried out.
Preferably, in the step e), the post-treatment further comprises burr treatment around the battery positive plate and sealing insulation treatment on the top of the battery positive plate.
Therefore, the invention has the following beneficial effects:
1) the invention can solve the problem of untight combination between the positive active substances of the high-specific-energy zinc-nickel battery, improve the combination performance between the active substances, reduce the softening and falling of the positive active substances, improve the conductivity, reduce the internal resistance, improve the utilization rate of the active substances, improve the charge acceptance of the electrode, improve the battery capacity, prolong the cycle service life and improve the charge-discharge conversion efficiency;
2) the invention can improve the cycle life and charge-discharge conversion efficiency of the high-specific energy zinc-nickel battery and avoid the early attenuation of the battery capacity.
Drawings
FIG. 1 is a graph showing a cycle test of a battery obtained in example 1 of the present invention and a discharge capacity test of a battery obtained in a comparative example;
fig. 2 is a graph showing cycle test-charge/discharge efficiency test of the battery according to example 1 of the present invention and the battery according to the comparative example.
Detailed Description
The technical solution of the present invention will be further described with reference to the following embodiments.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. 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.
In the present invention, all the equipments and materials are commercially available or commonly used in the industry, and the methods in the following examples are conventional in the art unless otherwise specified.
Example 1
A preparation method of a high specific energy zinc-nickel battery positive electrode comprises the following steps:
a) the raw material A is added with the thickening agent and evenly mixed to prepare the slurryThe material A consists of an active substance material and a conductive agent; the thickener is methylcellulose, and the active substance material is Ni (OH)2The conductive agent is polyacetylene; the weight ratio of the conductive agent to the active substance is 0.8: 100, the addition amount of the thickening agent is 0.5wt% of the sum of the conductive agent and the active substance;
b) mixing NiCl2Dissolving in water to obtain 0.1mol/L NiCl2The solution was stirred at 600rpm for 8 minutes and slurry A and NiCl were added2The naphthalene sulfonic acid formaldehyde condensate with the weight of 0.2wt% of the solution is continuously stirred for 5 minutes at the rotating speed of 800rpm to prepare slurry B; slurry A and NiCl2The weight ratio of the solution is 2: 1;
c) adding polytetrafluoroethylene into the slurry B, stirring at a high speed for 1 hour at 40 ℃, and cooling to room temperature after reaction to prepare anode slurry; the ratio of the addition amount of the polytetrafluoroethylene to the weight of the slurry B is 0.5: 180, the viscosity of the prepared positive electrode slurry is 5000 mpas;
d) placing the positive electrode substrate into the positive electrode slurry until the positive electrode substrate is completely submerged, and taking out the positive electrode substrate after the positive electrode substrate is placed for a period of time to obtain a battery positive plate;
e) post-treating to obtain the positive electrode of the high specific energy zinc-nickel battery; and the post-treatment specifically comprises the steps of clamping the prepared battery positive plate, then carrying out tabletting operation, treating burrs around the battery positive plate, and carrying out sealing glue insulation treatment on the top of the battery positive plate.
Example 2
A preparation method of a high specific energy zinc-nickel battery positive electrode comprises the following steps:
a) uniformly mixing the raw material A with a thickening agent to prepare slurry A, wherein the raw material A consists of an active substance material and a conductive agent; the thickener is hydroxypropyl methylcellulose, and the active substance material is Ni (OH)2The conductive agent is polythiophene; the weight ratio of the conductive agent to the active substance is 0.8: 85, the addition amount of the thickening agent is 0.5wt% of the sum of the conductive agent and the active substance;
b) mixing NiCl2Dissolving in water to obtain 0.1mol/L NiCl2The solution was stirred at 600rpm for 3 minutes and slurry A and NiCl were added20.25wt% of naphthalenesulfonic acid-formaldehyde condensate based on the weight of the solution, the rotation at 600rpm was continuedStirring for 5 minutes quickly to prepare slurry B; slurry A and NiCl2The weight ratio of the solution is 2: 1.2;
c) adding polytetrafluoroethylene into the slurry B, stirring at a high speed for 1 hour at 40 ℃, and cooling to room temperature after reaction to prepare anode slurry; the ratio of the addition amount of the polytetrafluoroethylene to the weight of the slurry B is 0.5: 180, preparing the positive electrode slurry with the viscosity of 7000 mpas;
d) placing the positive electrode substrate into the positive electrode slurry until the positive electrode substrate is completely submerged, and taking out the positive electrode substrate after the positive electrode substrate is placed for a period of time to obtain a battery positive plate;
e) post-treating to obtain the positive electrode of the high specific energy zinc-nickel battery; and the post-treatment specifically comprises the steps of clamping the prepared battery positive plate, then carrying out tabletting operation, treating burrs around the battery positive plate, and carrying out sealing glue insulation treatment on the top of the battery positive plate.
Example 3
A preparation method of a high specific energy zinc-nickel battery positive electrode comprises the following steps:
a) uniformly mixing the raw material A with a thickening agent to prepare slurry A, wherein the raw material A consists of an active substance material and a conductive agent; the thickener is sodium carboxymethylcellulose, and the active substance is Ni (OH)2The conductive agent is polypyrrole; the weight ratio of the conductive agent to the active substance is 2: 150, the addition amount of the thickening agent is 1.2wt% of the sum of the conductive agent and the active substance;
b) mixing NiCl2Dissolving in water to obtain 1mol/L NiCl2The solution was stirred at 800rpm for 10 minutes and slurry A and NiCl were added2The naphthalene sulfonic acid formaldehyde condensate with the weight of 0.5 percent of the solution is continuously stirred for 15 minutes at the rotating speed of 700rpm to prepare slurry B; slurry A and NiCl2The weight ratio of the solution is 2: 1.3;
c) adding polytetrafluoroethylene into the slurry B, stirring at a high speed for 3 hours at 70 ℃, and cooling to room temperature after reaction to prepare anode slurry; the ratio of the addition amount of the polytetrafluoroethylene to the weight of the slurry B is 3: 80, the viscosity of the prepared positive electrode slurry is 18000 mpas;
d) placing the positive electrode substrate into the positive electrode slurry until the positive electrode substrate is completely submerged, and taking out the positive electrode substrate after the positive electrode substrate is placed for a period of time to obtain a battery positive plate;
e) post-treating to obtain the positive electrode of the high specific energy zinc-nickel battery; and the post-treatment specifically comprises the steps of clamping the prepared battery positive plate, then carrying out tabletting operation, treating burrs around the battery positive plate, and carrying out sealing glue insulation treatment on the top of the battery positive plate.
Example 4
A preparation method of a high specific energy zinc-nickel battery positive electrode comprises the following steps:
a) uniformly mixing the raw material A with a thickening agent to prepare slurry A, wherein the raw material A consists of an active substance material and a conductive agent; the thickener is hydroxyethyl cellulose, and the active substance material is Ni (OH)2The conductive agent is polyaniline; the weight ratio of the conductive agent to the active substance is 1: 100, the addition amount of the thickening agent is 0.7wt% of the sum of the conductive agent and the active substance;
b) mixing NiCl2Dissolving in water to obtain 0.3mol/L NiCl2The solution was stirred at 650rpm for 4 minutes and slurry A and NiCl were added2The naphthalene sulfonic acid formaldehyde condensate with the weight of 0.3 percent of the solution is continuously stirred for 7 minutes at the rotating speed of 650rpm to prepare slurry B; slurry A and NiCl2The weight ratio of the solution is 2: 1.25;
c) adding polytetrafluoroethylene into the slurry B, stirring at a high speed for 1.5 hours at 50 ℃, and cooling to room temperature after reaction to prepare anode slurry; the ratio of the addition amount of the polytetrafluoroethylene to the weight of the slurry B is 3: 180, the viscosity of the prepared positive electrode slurry is 9000 mpas;
d) placing the positive electrode substrate into the positive electrode slurry until the positive electrode substrate is completely submerged, and taking out the positive electrode substrate after the positive electrode substrate is placed for a period of time to obtain a battery positive plate;
e) post-treating to obtain the positive electrode of the high specific energy zinc-nickel battery; and the post-treatment specifically comprises the steps of clamping the prepared battery positive plate, then carrying out tabletting operation, treating burrs around the battery positive plate, and carrying out sealing glue insulation treatment on the top of the battery positive plate.
Example 5
A preparation method of a high specific energy zinc-nickel battery positive electrode comprises the following steps:
a) uniformly mixing the raw material A with a thickening agent to prepare slurry A, wherein the raw material A is prepared from an active substance materialAnd a conductive agent; the thickener is sodium carboxymethylcellulose, and the active substance is Ni (OH)2The conductive agent is polyacetylene and polythiophene with the weight ratio of 1: 1; the weight ratio of the conductive agent to the active substance is 1.5: 130, the addition amount of the thickening agent is 1.0wt% of the sum of the conductive agent and the active substance;
b) mixing NiCl2Dissolving in water to obtain 0.9mol/L NiCl2The solution was stirred at 700rpm for 9 minutes and slurry A and NiCl were added2The naphthalene sulfonic acid formaldehyde condensate with the weight of 0.4 percent of the solution is continuously stirred for 12 minutes at the rotating speed of 700rpm to prepare slurry B; slurry A and NiCl2The weight ratio of the solution is 2: 1.5;
c) adding polytetrafluoroethylene into the slurry B, stirring at a high speed for 2.5 hours at the temperature of 60 ℃, and cooling to room temperature after reaction to prepare anode slurry; the ratio of the addition amount of the polytetrafluoroethylene to the weight of the slurry B is 2: 130, preparing the positive electrode slurry with the viscosity of 15000 mpas;
d) placing the positive electrode substrate into the positive electrode slurry until the positive electrode substrate is completely submerged, and taking out the positive electrode substrate after the positive electrode substrate is placed for a period of time to obtain a battery positive plate;
e) post-treating to obtain the positive electrode of the high specific energy zinc-nickel battery; and the post-treatment specifically comprises the steps of clamping the prepared battery positive plate, then carrying out tabletting operation, treating burrs around the battery positive plate, and carrying out sealing glue insulation treatment on the top of the battery positive plate.
Cycle performance test
The high specific energy nickel-zinc battery is prepared by assembling the battery anode prepared by the embodiment with the prior art and is marked as embodiments 1-5, and the commercially available nickel-zinc battery is adopted as a comparative example.
The batteries in the above examples 1 to 5 and comparative examples were subjected to cycle testing, and cycle test data of the batteries in example 1 and comparative example were selected for comparison, wherein two groups of performances of discharge capacity and charge-discharge efficiency were selected for comparison.
The comparison results are shown in fig. 1 and 2.
The comparison results are shown in fig. 1 and 2.
As shown in fig. 1, the nickel zinc cell prepared by the present invention has a stable discharge capacity, which slightly decreases after 600 cycles of the cycle test, and the discharge capacity of the nickel zinc cell in the comparative example also starts to decrease after 600 cycles of the cycle test, but it is clear from the figure that the discharge capacity of the cell in example 1 and the discharge capacity of the cell in the comparative example apparently decrease more slowly, and the discharge capacity is maintained at 7AH or more;
as shown in fig. 2, the nickel-zinc battery prepared by the invention has stable charge and discharge efficiency, which is maintained above 93% in the whole 1000 cycle tests, in contrast, the nickel-zinc battery in the comparative example has sharply reduced charge and discharge efficiency after 600 cycle tests, and the minimum charge and discharge efficiency reaches below 85%.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims (7)

1. A preparation method of a high specific energy zinc-nickel battery positive electrode is characterized by comprising the following steps:
a) uniformly mixing a raw material A with a thickening agent to prepare a slurry A, wherein the raw material A consists of an active substance material and a conductive agent;
b) dissolving nickel salt in water to prepare 0.1-1 mol/L nickel salt solution, stirring for 3-10 minutes, adding a surfactant accounting for 0.2-0.5 wt% of the weight of the slurry A and the nickel salt solution, and continuously stirring for 5-15 minutes to prepare slurry B;
c) adding polytetrafluoroethylene into the slurry B, and stirring at a high speed for 1-3 hours to prepare anode slurry;
d) placing the positive electrode substrate into the positive electrode slurry until the positive electrode substrate is completely submerged, and taking out the positive electrode substrate after the positive electrode substrate is placed for a period of time to obtain a battery positive plate;
e) post-treating to obtain the positive electrode of the high specific energy zinc-nickel battery;
the active material is Ni (OH)2Or Ni (OH)2One of the composite materials;
the conductive agent is at least one of polyacetylene, polythiophene, polypyrrole or polyaniline;
the thickening agent is one of methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose or hydroxyethyl cellulose;
the weight ratio of the slurry A to the nickel salt solution is 2: 1-1.5;
the surfactant is a naphthalenesulfonic acid formaldehyde condensate.
2. The method for preparing the positive electrode of the high-specific-energy zinc-nickel battery according to claim 1, wherein the method comprises the following steps:
in the step a), the weight ratio of the conductive agent to the active substance is (0.8-2): (85-150), and the addition amount of the thickening agent is 0.5-1.2 wt% of the total weight of the conductive agent and the active substance.
3. The method for preparing the positive electrode of the high-specific-energy zinc-nickel battery according to claim 1, wherein the method comprises the following steps:
in the step b), the stirring speed is 600-800 rpm.
4. The method for preparing the positive electrode of the high-specific-energy zinc-nickel battery according to claim 1, wherein the method comprises the following steps:
in the step c), the ratio of the addition amount of the polytetrafluoroethylene to the weight of the slurry B is (0.5-3): (80-180) the reaction temperature is 40-70 ℃, and cooling to room temperature after reaction.
5. The method for preparing the positive electrode of the high-specific-energy zinc-nickel battery according to claim 1, wherein the method comprises the following steps:
in the step c), the viscosity of the prepared positive electrode slurry is 5000-18000 mpas.
6. The method for preparing the positive electrode of the high-specific-energy zinc-nickel battery according to claim 1, wherein the method comprises the following steps:
in the step e), the post-treatment is to clamp the prepared battery positive plate and then perform tabletting operation.
7. The method for preparing the positive electrode of the high-specific-energy zinc-nickel battery as claimed in claim 1 or 6, wherein the method comprises the following steps:
in the step e), the post-treatment further comprises burr treatment around the battery positive plate and sealant insulation treatment on the top of the battery positive plate.
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