CN113540411B - Battery negative plate, preparation method thereof and nickel-hydrogen battery - Google Patents
Battery negative plate, preparation method thereof and nickel-hydrogen battery Download PDFInfo
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- CN113540411B CN113540411B CN202110650152.6A CN202110650152A CN113540411B CN 113540411 B CN113540411 B CN 113540411B CN 202110650152 A CN202110650152 A CN 202110650152A CN 113540411 B CN113540411 B CN 113540411B
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- negative electrode
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- polytetrafluoroethylene
- butadiene rubber
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- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 229910052739 hydrogen Inorganic materials 0.000 title abstract description 15
- 239000001257 hydrogen Substances 0.000 title abstract description 15
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 92
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 89
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 89
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 63
- 239000010410 layer Substances 0.000 claims abstract description 47
- 239000007773 negative electrode material Substances 0.000 claims abstract description 47
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 239000012790 adhesive layer Substances 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims description 49
- 239000011267 electrode slurry Substances 0.000 claims description 42
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 41
- 238000003756 stirring Methods 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000006258 conductive agent Substances 0.000 claims description 22
- 239000000654 additive Substances 0.000 claims description 21
- 239000011230 binding agent Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- 230000000996 additive effect Effects 0.000 claims description 16
- 239000008367 deionised water Substances 0.000 claims description 16
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 14
- 239000006185 dispersion Substances 0.000 claims description 12
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 12
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 12
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 12
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 12
- 229910000858 La alloy Inorganic materials 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 10
- 239000001761 ethyl methyl cellulose Substances 0.000 claims description 10
- 235000010944 ethyl methyl cellulose Nutrition 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 229910052987 metal hydride Inorganic materials 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 5
- 239000005060 rubber Substances 0.000 claims description 5
- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 4
- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims 2
- 239000006183 anode active material Substances 0.000 claims 1
- 239000010405 anode material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 14
- 239000013543 active substance Substances 0.000 abstract description 13
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract 1
- 229910052759 nickel Inorganic materials 0.000 description 18
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 15
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 9
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
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- 229910052725 zinc Inorganic materials 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 239000001768 carboxy methyl cellulose Substances 0.000 description 6
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- 238000005520 cutting process Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 239000002174 Styrene-butadiene Substances 0.000 description 4
- 239000011149 active material Substances 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 4
- 239000010941 cobalt Substances 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- 239000006256 anode slurry Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 3
- 125000001165 hydrophobic group Chemical group 0.000 description 3
- 239000007943 implant Substances 0.000 description 3
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- 238000006277 sulfonation reaction Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
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- 229910052727 yttrium Inorganic materials 0.000 description 2
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- HSSJULAPNNGXFW-UHFFFAOYSA-N [Co].[Zn] Chemical compound [Co].[Zn] HSSJULAPNNGXFW-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
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- 229920000098 polyolefin Polymers 0.000 description 1
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- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- H01M4/24—Electrodes for alkaline accumulators
- H01M4/26—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
- H01M4/24—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
- 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
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated 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
- H01M4/628—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
- H01M2004/027—Negative 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
In order to overcome the defects of poor high temperature resistance and complex preparation process of a nickel-hydrogen battery in the prior art, the invention provides a battery negative plate and a preparation method thereof, wherein the battery negative plate comprises a substrate, a negative electrode material layer and a bonding layer, the negative electrode material layer covers the surface of the substrate, and the bonding layer covers the surface of the negative electrode material layer, which is away from the substrate; the adhesive layer comprises polytetrafluoroethylene and styrene-butadiene rubber. The battery negative electrode plate provided by the invention forms an adhesive layer by polytetrafluoroethylene and styrene-butadiene rubber, and the polytetrafluoroethylene has excellent adhesive property, hydrophobicity and film forming effect, so that the adhesive property and corrosion resistance of a negative electrode active substance can be improved, the high temperature resistance of a nickel-hydrogen battery is improved, and meanwhile, the polytetrafluoroethylene can be uniformly adhered to the surface of the negative electrode plate due to the excellent dispersibility of the styrene-butadiene rubber, and the film forming effect is improved.
Description
Technical Field
The invention belongs to the field of batteries, and particularly relates to a battery negative plate, a preparation method thereof and a nickel-hydrogen battery.
Background
Compared with nickel-cadmium batteries, the nickel-hydrogen batteries have the characteristics of high energy ratio, no pollution and excellent environmental safety, are favored by various industries, and have a trend of comprehensively replacing the nickel-cadmium batteries along with the enhancement of environmental awareness of people. However, nickel-metal hydride batteries exhibit insufficient durability in high temperature environments as compared to nickel-cadmium batteries, and thus limit their use in energy storage/backup power. The reason for this is mainly that the negative electrode active material is corroded, expands in volume, and causes the active material to separate from the negative electrode substrate, and all the active material adheres to the separator, so that the internal resistance of the battery rises above 1000mΩ, and the battery cannot be charged or discharged to fail. Therefore, improving the corrosion resistance of the negative electrode active material and improving the adhesion of the active material are important techniques for enhancing the high temperature durability of the nickel-metal hydride battery.
In the prior art, polytetrafluoroethylene (PTFE) has excellent adhesion, hydrophobicity and film-forming effect, and therefore, it is generally selected to add Polytetrafluoroethylene (PTFE) to the negative electrode to improve the adhesion of the negative electrode active material and suppress corrosion of the negative electrode active material. However, the realization of the technical effect is critical to the adding proportion and process of Polytetrafluoroethylene (PTFE), the conventional mode in the field is to soak the negative electrode plate into Polytetrafluoroethylene (PTFE) solution, the process is complex and the cost is high, and the mode of dispersing polytetrafluoroethylene by alcohol and then spraying the polytetrafluoroethylene onto the negative electrode plate has great potential safety hazard due to the use of inflammable substance alcohol. Therefore, further improvements in formulation and production process are needed to ensure efficient and high quality production of high temperature resistant nickel-metal hydride battery negative plates.
Disclosure of Invention
The invention solves the technical problems of poor high temperature resistance and complex preparation process of a nickel-hydrogen battery in the prior art, and provides a battery negative plate and a preparation method thereof.
The aim of the invention is achieved by the following technical scheme:
the invention provides a battery negative plate which comprises a substrate, a negative electrode material layer and a bonding layer, wherein the negative electrode material layer covers the surface of the substrate, and the bonding layer covers the surface, away from the substrate, of the negative electrode material layer;
the adhesive layer comprises polytetrafluoroethylene and styrene-butadiene rubber.
Optionally, the adhesive layer comprises the following components in parts by weight:
1.5 to 4.5 parts of polytetrafluoroethylene and 1 to 2 parts of styrene-butadiene rubber.
Optionally, the negative electrode material layer comprises the following components in parts by weight:
dispersing a binder: 2-4 parts;
conductive agent: 2-4 parts;
negative electrode active material: 90-95 parts;
additive: 1-2 parts.
Optionally, the dispersion binder is at least one selected from Ethyl Methyl Cellulose (EMC), hydroxymethyl cellulose (CMC), hydroxypropyl methyl cellulose (HPMC), polytetrafluoroethylene (PTFE);
optionally, the conductive agent is at least one selected from nickel powder, cobalt powder and carbon powder;
the negative electrode active material is AB 5 High lanthanum alloys, further, the AB 5 The metering type of the high lanthanum alloy is La 0.65 A 0.27 Pr 0.02 Nd 0.06 Ni 3.55 Mn 0.39 B 0.34 Co 0.72 Wherein A is selected from at least one of La, ce, pr, nd, gd, sm, Y, mg elements, and B is selected from at least one of Ni, co, mn, al, fe, zr, si elements;
the additive is selected from CoO and Y 2 O 3 、Eu 2 O 3 、Gd 2 O 3 At least one of them.
The invention also provides a preparation method of the battery negative plate, which comprises the following steps:
s1: slurry preparation
Obtaining negative electrode slurry, adding polytetrafluoroethylene and styrene-butadiene rubber into the negative electrode slurry, stirring, and forming a glue layer comprising polytetrafluoroethylene and styrene-butadiene rubber above the negative electrode slurry;
s2: preparation of negative plate
And (3) passing the substrate through the negative electrode slurry and the adhesive layer obtained in the step (S1) through slurry pulling so as to form a negative electrode material layer and an adhesive layer on the surface of the substrate, and drying to obtain the negative electrode sheet.
Optionally, the step of obtaining the negative electrode slurry includes the following steps:
and (3) stirring and mixing the dispersing binder, the conductive agent, the negative electrode active material, the additive and deionized water according to the required parts.
Optionally, the "adding polytetrafluoroethylene and styrene-butadiene rubber into the negative electrode slurry, stirring, and forming a glue layer including polytetrafluoroethylene and styrene-butadiene rubber over the negative electrode slurry" includes the following steps:
adding polytetrafluoroethylene and styrene-butadiene rubber into the negative electrode slurry, controlling the stirring speed to be 200-400r/min, stirring for 10-30min, transferring the slurry into a slurry pulling furnace, controlling the liquid level to be 12-18cm, and standing for 5-30min to form a rubber layer comprising polytetrafluoroethylene and styrene-butadiene rubber above the negative electrode slurry.
Optionally, the tape running speed of the substrate is 2.0-3.5m/min; the temperature of the pulp pulling is 85-135 ℃, and the pulp is dried in a temperature region.
The invention also provides a nickel-hydrogen battery, which comprises a positive plate, electrolyte, a diaphragm and the negative plate.
The invention has the beneficial effects that: the negative electrode plate provided by the invention forms an adhesive layer by polytetrafluoroethylene and styrene-butadiene rubber, and the polytetrafluoroethylene has excellent adhesive property, hydrophobicity and film forming effect, so that the adhesive property and corrosion resistance of a negative electrode active substance can be improved, the high temperature resistance of a nickel-hydrogen battery is improved, the service life is prolonged, and simultaneously, the polytetrafluoroethylene can be uniformly adhered to the surface of the negative electrode plate due to the excellent dispersibility of the styrene-butadiene rubber.
According to the preparation method of the battery negative plate, a wet Faraday slurry process is adopted, and the excellent fusion property of polytetrafluoroethylene and styrene-butadiene rubber and the rejection property of styrene-butadiene rubber, ethyl methyl cellulose, hydroxymethyl cellulose and hydroxypropyl cellulose are utilized, so that the upper layer of the slurry is a uniform dispersion liquid containing polytetrafluoroethylene after standing, the liquid level is further controlled, the polytetrafluoroethylene can just form a film with uniform thickness on the surface of a substrate, the film forming effect of the negative electrode slurry pulling is improved, the high temperature resistance and the overcharge resistance of the battery are improved, the process is simple, and the production cost is low.
Drawings
FIG. 1 is a schematic diagram of a slurry pulling device according to the present invention;
reference numerals illustrate: 1. an oven; 2. a base; 3. a glue layer; 4. a fixed shaft; 5. a hopper; 6. and (3) negative electrode slurry.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the embodiments. 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.
The embodiment of the invention discloses a battery negative plate, which comprises a substrate, a negative electrode material layer and a bonding layer, wherein the negative electrode material layer covers the surface of the substrate, and the bonding layer covers the surface, facing away from the substrate, of the negative electrode material layer;
the adhesive layer comprises polytetrafluoroethylene and styrene-butadiene rubber.
According to the battery negative electrode plate provided by the invention, polytetrafluoroethylene and styrene-butadiene rubber with excellent dispersibility are matched for use, so that the slurry pulling process can be simplified, uniform adhesion of polytetrafluoroethylene on the surface of a substrate is ensured, meanwhile, the excellent cohesiveness of polytetrafluoroethylene can improve the adhesion of a negative electrode active substance and the substrate, the falling off is reduced, the hydrophobic property of polytetrafluoroethylene can effectively prevent electrolyte from entering the negative electrode plate, the recombination of oxygen on the surface of an MH electrode is enhanced, the corrosion speed of the negative electrode is effectively reduced, the utilization rate of the negative electrode active substance is improved, and the high temperature resistance and the overcharge resistance of a nickel-hydrogen battery are enhanced.
Further, the styrene-butadiene rubber is a white suspension formed by suspending a large number of small particles in water, the particle surfaces of the styrene-butadiene rubber are modified by carboxyl groups, the styrene-butadiene rubber has hydrophilicity, and can stably suspend in the water, and the styrene-butadiene rubber and polytetrafluoroethylene have excellent fusion property.
In the present invention, the source of the substrate is not particularly limited, and may be prepared in a conventional manner in the art, or may be commercially available, such as nickel plated steel strip, nickel foam, etc. The thickness of the substrate may be conventional in the art, for example 0.06.+ -. 0.01mm.
In some embodiments, the tie layer comprises the following weight components:
1.5 to 4.5 parts of polytetrafluoroethylene and 1 to 2 parts of styrene-butadiene rubber.
By using 1.5-4.5 parts of polytetrafluoroethylene and 1-2 parts of styrene-butadiene rubber in a matching way, the excellent cohesiveness of the polytetrafluoroethylene can be fully exerted, meanwhile, the dispersibility of the styrene-butadiene rubber is exerted, the polytetrafluoroethylene can be dispersed more uniformly, the slurry drawing film forming effect of the polytetrafluoroethylene is improved, and the high temperature resistance of the battery is improved.
In some embodiments, the dispersion binder is selected from at least one of Ethyl Methyl Cellulose (EMC), hydroxymethyl cellulose (CMC), hydroxypropyl methyl cellulose (HPMC), polytetrafluoroethylene (PTFE);
further, the dispersion binder is mainly used for increasing the viscosity of slurry, enabling active substances to be firmly attached to a matrix, reducing falling, improving the high temperature resistance and overcharge resistance of a battery, wherein Ethyl Methyl Cellulose (EMC), carboxymethyl cellulose (CMC) and hydroxypropyl methyl cellulose (HPMC) belong to one of cellulose ethers, the cellulose ethers have more excellent viscosity, meanwhile, the cellulose ethers have hydrophilic groups and hydrophobic groups, on one hand, the main chain of the hydrophobic groups is adsorbed on the surface of the negative electrode active substances, and on the other hand, the hydrophilic groups are connected with water molecules, so that the negative electrode active substances are uniformly dispersed in water along with the cellulose ethers, and the film forming effect of polytetrafluoroethylene during later slurry pulling is improved.
In some embodiments, the conductive agent is selected from at least one of nickel powder, cobalt powder, carbon powder;
the negative electrode active material is AB 5 High lanthanum alloys, further, the AB 5 The metering type of the high lanthanum alloy is La 0.65 A 0.27 Pr 0.02 Nd 0.06 Ni 3.55 Mn 0.39 B 0.34 Co 0.72 Wherein A is selected from at least one of La, ce, pr, nd, gd, sm, Y, mg elements, and B is selected from at least one of Ni, co, mn, al, fe, zr, si elements;
the additive is selected from CoO and Y 2 O 3 、Eu 2 O 3 、Gd 2 O 3 At least one of them.
Further, the kind of the conductive agent is not particularly limited in the present invention, and other conventional conductive agents in the art, such as super carbon black, carbon nanotubes, zinc powder, graphite powder, acetylene black, cobalt zinc alloy powder, etc., may be selected.
Furthermore, the conductive agent is used for increasing the electron conductivity of the negative electrode, reducing the polarization effect of the negative electrode under ultra-low temperature and high current discharge, and improving the electrochemical catalytic performance of the negative electrode.
Further, the AB 5 The surface of the high lanthanum alloy has hydrophobicity and can be adsorbed with cellulose ether containing hydrophobic groups, and the AB 5 The high lanthanum alloy has the weight component of 90-95 parts, and the adhesive layer containing polytetrafluoroethylene and styrene-butadiene rubber is added and the process is improved, so that the negative electrode slurry has excellent adhesive force and hydrophobicity, and even if the weight component of the negative electrode active material is increased to 90-95 parts, the battery can still maintain excellent high temperature resistance and overcharge resistance, so that the invention can further increase the energy density of the battery.
Further, the additive is mainly used for improving electrochemical catalytic performance of the cathode and cycling stability of the battery. The kind of the additive is not particularly limited in the present invention, and other additives conventionally used in the art, such as Tb, may be selected 2 O 3 、Yb 2 O 3 And (3) an equal rare earth oxide.
The embodiment of the invention discloses a preparation method of a battery negative plate, which comprises the following steps:
s1: slurry preparation
Obtaining negative electrode slurry, adding polytetrafluoroethylene and styrene-butadiene rubber into the negative electrode slurry, stirring, and forming a glue layer comprising polytetrafluoroethylene and styrene-butadiene rubber above the negative electrode slurry;
s2: preparation of negative plate
And (3) passing the substrate through the negative electrode slurry and the adhesive layer obtained in the step (S1) through slurry pulling so as to form a negative electrode material layer and an adhesive layer on the surface of the substrate, and drying to obtain the negative electrode sheet.
In some embodiments, the "obtaining a negative electrode slurry" includes the steps of:
and (3) stirring and mixing the dispersing binder, the conductive agent, the negative electrode active material, the additive and deionized water according to the required parts.
In the process of preparing the slurry, firstly, the dispersion binder, the conductive agent, the negative electrode active substance and the additive are initially mixed and stirred, and then the polytetrafluoroethylene and the styrene-butadiene rubber are added.
In some embodiments, the "adding polytetrafluoroethylene and styrene-butadiene rubber to the negative electrode slurry, stirring, forming a glue layer comprising polytetrafluoroethylene and styrene-butadiene rubber over the negative electrode slurry" comprises the steps of:
adding polytetrafluoroethylene and styrene-butadiene rubber into the negative electrode slurry, controlling the stirring speed to be 200-400r/min, stirring for 10-30min, transferring the slurry into a slurry pulling furnace, controlling the liquid level to be 12-18cm, and standing for 5-30min to form a rubber layer comprising polytetrafluoroethylene and styrene-butadiene rubber above the negative electrode slurry.
Further, the stirring speed and the stirring time are controlled within the range, so that the uniformity of the polytetrafluoroethylene dispersion in the slurry and the effect of standing and layering can be improved, the stirring speed is too high, the stirring time is too long, the time required for the subsequent standing and layering is too long due to the excessive dispersion, and the production efficiency is reduced; meanwhile, part of polytetrafluoroethylene cannot float upwards, so that the layering effect is poor, and the film forming effect of polytetrafluoroethylene is affected. The stirring speed is too slow, the stirring time is too short, the dispersion is insufficient, and when the styrene-butadiene rubber is kept stand, a part of styrene-butadiene rubber floats upwards, so that the polytetrafluoroethylene is unevenly dispersed.
Further, the purpose of static delamination is to cause the polytetrafluoroethylene and styrene-butadiene rubber in the slurry to be delaminated from other components, and the liquid level in the hopper is controlled to be 12cm-18cm, so that the polytetrafluoroethylene at the uppermost layer of the slurry can be just attached to the surface of the substrate to which the negative electrode active material is attached.
The surface groups of the styrene-butadiene rubber are electronegative, the styrene-butadiene rubber is mutually exclusive and poor in compatibility with carboxyl groups on the surfaces of cellulose ethers such as Ethyl Methyl Cellulose (EMC), carboxymethyl cellulose (CMC) and hydroxypropyl methyl cellulose (HPMC), the styrene-butadiene rubber gradually floats to the surface of the slurry in the standing process, polytetrafluoroethylene with good compatibility with the styrene-butadiene rubber floats along with the styrene-butadiene rubber, so that the slurry layering phenomenon occurs, as shown in figure 1 of the specification attached to the drawings, the liquid level is controlled to be 12cm-18cm in the drawing process, a substrate firstly passes through the negative electrode slurry containing the negative electrode active material at the lower layer, the negative electrode active material is immediately attached to the surface of the substrate at the moment, the substrate with the negative electrode active material is then passed through a glue layer containing the polytetrafluoroethylene and the styrene-butadiene rubber along with the movement of a conveyor belt, at the moment, the polytetrafluoroethylene just can form a uniform and compact film on the surface of the substrate with the negative electrode active material, the film forming effect is better, the hydrophobicity of the surface of the negative electrode active material is improved, the corrosion resistance of the negative electrode active material is enhanced, and the high temperature resistance and the overcharge resistance of a battery are improved.
Further, the regional drying is beneficial to the evaporation of the water of the negative plate and the formation of a polytetrafluoroethylene film on the surface; the water content of the dried negative plate is further controlled to be kept between 0.3 and 0.8 percent.
The invention also discloses a nickel-hydrogen battery, which comprises a positive plate, electrolyte, a diaphragm and the negative plate.
The invention is not particularly limited in the type of the positive electrode sheet, and can be prepared or obtained commercially in a conventional manner in the art, for example, the positive electrode sheet can be prepared by the following steps:
s1: preparation of the slurry
2% -5% of binder (including but not limited to PVA, CMC, PTFE, SBR), 2.2% -5.0% of conductive agent (including but not limited to Ni, co, coO, C, coOOH), and additives (including but not limited to ZnO, tiO 2 、Y 2 O 3 、Er 2 O 3 、Yb 2 O 3 ) 2% -3% of positive electrode ball nickel (cobalt-coated zinc ball nickel, 0.7% of inner core, 3.5% -4.4% of zinc) 87% -93.8% of deionized water, and the balance of deionized water, sequentially adding a vacuumizing stirrer, and controlling stirring speed and time to uniformly disperse active substances to prepare positive electrode slurry;
s2: preparation of positive plate
The surface density is selected to be 320-380g/m 2 The foamed nickel is used as a matrix material, and is subjected to continuous wet slurry, powdering, double-roller compaction, slitting, weighing, ultrasonic end face welding or ultrasonic tab welding to obtain the positive plate.
The source of the electrolyte is not particularly limited and may be prepared or commercially available in a conventional manner in the art, for example, one or more of aqueous potassium hydroxide, aqueous sodium hydroxide, aqueous lithium hydroxide, and more preferably OH composed of potassium hydroxide, sodium hydroxide, lithium hydroxide, and deionized water - Electrolyte with the concentration of 5.6mol/L to 6.2 mol/L.
The source of the separator is not particularly limited in the present invention, and may be prepared or commercially available in a conventional manner in the art, for example, a nonwoven fabric of polyamide fibers, a nonwoven fabric containing polyolefin fibers. The areal density and thickness of the separator may be as conventional in the art, for example, an areal density of 54-56g/m 2 The thickness is 0.15mm-0.16mm.
The present invention is not particularly limited in the manner of assembling the nickel-metal hydride battery, and for example, the positive electrode sheet and the negative electrode sheet are separated by a separator, the separator is wound and molded, the steel can is implanted, and the electrolyte is injected to seal the battery.
The present invention will be described in further detail with reference to examples. 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.
Example 1
Preparation of a positive plate:
2 parts of binder (PVA, CMC, PTFE, SBR), 5.0 parts of conductive agent (Ni, co) and additives (ZnO, tiO) 2 2 parts of anode ball nickel (cobalt-coated zinc ball nickel, 0.7% of inner core and 4.4% of zinc) 88 parts of deionized water and 3 parts of deionized water are sequentially added into a vacuumizing stirrer, stirring is controlled to be 250r/min, stirring is carried out for 150min, anode active substances are uniformly dispersed, anode slurry is formed, and then the anode plate is prepared through slurry pulling, drying, tabletting, cutting and the like.
Preparing a negative plate:
dispersing binder 2 parts, conductive agent 2 parts, negative electrode active material 92 parts, and additiveSequentially adding 1 part of deionized water and 3 parts of deionized water into a vacuumizing stirrer, controlling the stirring speed to be 250r/min, stirring for 120min to uniformly disperse active substances, adding 3 parts of polytetrafluoroethylene and 1.8 parts of styrene-butadiene rubber, stirring for 10min at a low speed of 200r/min, controlling the solid content of slurry to be 80%, transferring the slurry to a slurry pulling hopper to keep the liquid level at 16cm, using a nickel-plated steel belt with the thickness of 0.06mm as a substrate, and carrying out slurry pulling, sheet drying, rolling, cutting and the like to prepare a negative plate A; wherein the dispersion binder is HPMC, the conductive agent is 0.3% carbon black+1.7wt% nickel powder, and the negative electrode active material is AB 5 High lanthanum alloy (metering La) 0.65 Ce 0.27 Pr 0.02 Nd 0.06 Ni 3.55 Mn 0.39 Al 0.34 Co 0.72 ) The additive is Y 2 O 3 。
And (3) battery assembly:
the positive plate and the negative plate A are combined to form a positive plate with the surface density of 54g/m 2 Japanese imported diaphragm with low sulfonation degree and superfine fiber added and thickness of 0.15mm is wound and molded to implant steel shell, and OH composed of potassium hydroxide/sodium hydroxide/lithium hydroxide/pure water is injected - And (3) sealing the electrolyte with the concentration of 5.6mol/L to prepare the 60D6000 battery cell.
Comparative example 1
Preparation of a positive plate:
2 parts of binder (PVA, CMC, PTFE, SBR), 5.0 parts of conductive agent (Ni, co) and additives (ZnO, tiO) 2 2 parts of anode ball nickel (cobalt-coated zinc ball nickel, 0.7% of inner core and 4.4% of zinc) 88 parts of deionized water and 3 parts of deionized water are sequentially added into a vacuumizing stirrer, stirring is controlled to be 250r/min, stirring is carried out for 150min, anode active substances are uniformly dispersed, anode slurry is formed, and then the anode plate is prepared through slurry pulling, drying, tabletting, cutting and the like.
Preparing a negative plate:
3 parts of dispersing binder, 2 parts of conductive agent, 92 parts of negative electrode active material, 1 part of additive, 1 part of deionized water and 3 parts of polytetrafluoroethylene are sequentially added into a vacuumizing stirrer, the stirring speed is 300r/min, the stirring is carried out for 135min, after the slurry is formed into slurry, a nickel-plated steel belt with the thickness of 0.06mm is used as a matrix, and the slurry is drawn,Baking, rolling, cutting and the like to prepare a negative plate B; wherein the dispersion binder is HPMC, the conductive agent is 0.3% carbon black+1.7wt% nickel powder, and the negative electrode active material is AB 5 High lanthanum alloy (metering La) 0.65 Ce 0.27 Pr 0.02 Nd 0.06 Ni 3.55 Mn 0.39 Al 0.34 Co 0.72 ) The additive is Y 2 O 3 。
And (3) battery assembly:
the positive plate and the negative plate B are combined to form a positive plate with the surface density of 54g/m 2 Japanese imported diaphragm with low sulfonation degree and superfine fiber added and thickness of 0.15mm is wound and molded to implant steel shell, and OH composed of potassium hydroxide/sodium hydroxide/lithium hydroxide/pure water is injected - And (3) sealing the electrolyte with the concentration of 5.6mol/L to prepare the 60D6000 battery cell.
Comparative example 2
Preparation of a positive plate:
2 parts of binder (PVA, CMC, PTFE, SBR), 5.0 parts of conductive agent (Ni, co) and additives (ZnO, tiO) 2 2 parts of anode ball nickel (cobalt-coated zinc ball nickel, 0.7% of inner core and 4.4% of zinc) 88 parts of deionized water and 3 parts of deionized water are sequentially added into a vacuumizing stirrer, stirring is controlled to be 200r/min, stirring is carried out for 150min, anode active substances are uniformly dispersed, anode slurry is formed, and then the anode plate is prepared through slurry pulling, drying, tabletting, cutting and the like.
Preparing a negative plate:
sequentially adding 3 parts of dispersing binder, 2 parts of conductive agent, 92 parts of negative electrode active material, 1 part of additive and 1 part of deionized water into a vacuumizing stirrer, controlling the stirring speed to be 300r/min, stirring for 120min to uniformly disperse the active material, adding 3 parts of polytetrafluoroethylene after the slurry is slurried, stirring for 15min at a low speed of 300r/min, controlling the solid content of the slurry to be 80%, transferring the slurry to a slurry pulling hopper, keeping the liquid level at 16cm, using a nickel plated steel belt with the thickness of 0.06mm as a matrix, and preparing a negative electrode plate C through slurry pulling, sheet drying, rolling, cutting and the like; wherein the dispersion binder is HPMC, the conductive agent is 0.3% carbon black+1.7wt% nickel powder, and the negative electrode active material is AB 5 High lanthanum alloy (metering La) 0.65 Ce 0.27 Pr 0.02 Nd 0.06 Ni 3.55 Mn 0.39 Al 0.34 Co 0.72 ) The additive is Y 2 O 3 。
And (3) battery assembly:
the positive plate and the negative plate C are combined to form a positive plate with the surface density of 54g/m 2 Japanese imported diaphragm with low sulfonation degree and superfine fiber added and thickness of 0.15mm is wound and molded to implant steel shell, and OH composed of potassium hydroxide/sodium hydroxide/lithium hydroxide/pure water is injected - And (3) sealing the electrolyte with the concentration of 5.6mol/L to prepare the 60D6000 battery cell. Performance test:
the nickel-metal hydride batteries prepared in example 1 and comparative examples 1-2 were tested according to the IEC 61951-2/2017.5.2.5 test method, and the test results were filled in Table 1.
IEC test method (according to IEC61951-2:2017 ≡ 7.5.2.5):
A. under 50 ℃ environment: the sample is stored for 16 hours and then tested as follows:
the first step: charging with 300mA for 48 hours, and discharging with 1200mA to 1.0V;
and a second step of: charging with 300mA for 24 hours, and discharging with 1200mA to 1.0V; this cycle was repeated twice.
B. The battery is put under the environment of 70 ℃ for the following steps: charging with 300mA for 120 days, discharging with 1200mA to 1.0V, and repeating the cycle three times.
C. The battery is subjected to the following conditions of 50 ℃: firstly, storing for 16 hours, discharging to 1.0V by using 1200mA, and testing the discharge capacity according to the following method;
the first step: charging with 300mA for 48 hours, and discharging with 1200mA to 1.0V;
and a second step of: charging with 300mA for 24 hours, and discharging with 1200mA to 1.0V; this cycle was repeated twice.
TABLE 1
As is clear from the test results of Table 1, in both comparative example 1 and comparative example 2, styrene-butadiene rubber was not added, and in comparison with comparative example 2, in comparative example 1, polytetrafluoroethylene and other components were simultaneously put into stirring and dispersing during the preparation of the negative electrode slurry, and the liquid level was not controlled during the drawing, and in comparative example 2, polytetrafluoroethylene was put into the process after the other components were primarily uniformly mixed, and the liquid level was controlled to be in the range of 12cm-18cm, and in the test results, in the test of high temperature performance and overcharge resistance, the discharge time of comparative example 2 was longer than that of comparative example 1, so that in the process of preparing the slurry, the adhesiveness and hydrophobicity of the negative electrode active material and the control of the liquid level during the drawing were improved, and the high temperature resistance and overcharge resistance of the nickel-hydrogen battery were improved.
In example 1, compared with comparative example 2, in example 1, styrene-butadiene rubber was further added in the preparation of the slurry to be used in combination with polytetrafluoroethylene, and from the test results, it is known that in the high temperature performance and overcharge resistance test, the discharge time of example 1 is further longer than that of comparative example 2, which means that the combination of polytetrafluoroethylene and styrene-butadiene rubber can further improve the film forming effect of polytetrafluoroethylene and improve the high temperature resistance and overcharge resistance of the nickel-hydrogen battery.
Therefore, the invention can improve the cohesiveness and corrosion resistance of the negative electrode active material, improve the high temperature and overcharge resistance of the nickel-hydrogen battery and prolong the service life of the nickel-hydrogen battery by adding the polytetrafluoroethylene styrene-butadiene rubber as the bonding layer and improving the feeding sequence in the process of the negative electrode slurry and controlling the liquid level in the process of slurry pulling.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The battery negative plate is characterized by comprising a substrate, a negative electrode material layer and a bonding layer, wherein the negative electrode material layer covers the surface of the substrate, and the bonding layer covers the surface, facing away from the substrate, of the negative electrode material layer;
the bonding layer comprises polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber;
the anode material layer includes an anode active material; the negative electrode active material is AB 5 High lanthanum alloy;
the preparation method of the battery negative plate comprises the following steps:
s1: slurry preparation
Obtaining negative electrode slurry, adding polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber into the negative electrode slurry, stirring, and forming a rubber layer comprising polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber above the negative electrode slurry;
s2: preparation of negative plate
Sequentially passing a matrix through the negative electrode slurry and the adhesive layer obtained in the step S1 through slurry pulling to form a negative electrode material layer and an adhesive layer on the surface of the matrix, and drying to obtain the negative electrode sheet;
wherein, the step of adding polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber into the negative electrode slurry, stirring, and forming a glue layer comprising polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber above the negative electrode slurry comprises the following steps:
adding polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber into the negative electrode slurry, controlling the stirring speed to be 200-400r/min, stirring for 10-30min, transferring the slurry into a slurry pulling furnace, controlling the liquid level to be 12-18cm, standing for 5-30min, and forming a glue layer comprising polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber above the negative electrode slurry.
2. The battery negative electrode sheet according to claim 1, wherein the adhesive layer comprises the following components by weight:
1.5 to 4.5 parts of polytetrafluoroethylene and 1 to 2 parts of carboxyl modified styrene butadiene rubber.
3. The battery negative electrode sheet according to claim 1, wherein the negative electrode material layer comprises the following components by weight:
dispersing a binder: 2-4 parts;
conductive agent: 2-4 parts;
negative electrode active material: 90-95 parts;
additive: 1-2 parts.
4. The battery negative electrode sheet according to claim 3, wherein the dispersion binder is at least one selected from the group consisting of ethyl methyl cellulose, hydroxymethyl cellulose, hydroxypropyl methyl cellulose, and polytetrafluoroethylene.
5. The battery negative electrode sheet according to claim 3, wherein the conductive agent is at least one selected from nickel powder, cobalt powder, and carbon powder;
the negative electrode active material is AB 5 High lanthanum alloy;
the additive is selected from CoO and Y 2 O 3 、Eu 2 O 3 、Gd 2 O 3 At least one of them.
6. The method for preparing the battery negative electrode sheet according to any one of claims 1 to 5, comprising the steps of:
s1: slurry preparation
Obtaining negative electrode slurry, adding polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber into the negative electrode slurry, stirring, and forming a rubber layer comprising polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber above the negative electrode slurry;
s2: preparation of negative plate
And (3) sequentially passing the substrate through the negative electrode slurry and the adhesive layer obtained in the step (S1) through slurry pulling so as to form a negative electrode material layer and an adhesive layer on the surface of the substrate, and drying to obtain the negative electrode sheet.
7. The method of manufacturing a negative electrode sheet for a battery according to claim 6, wherein the step of "obtaining a negative electrode slurry" comprises the steps of:
and (3) stirring and mixing the dispersing binder, the conductive agent, the negative electrode active material, the additive and deionized water according to the required parts.
8. The method of manufacturing a negative electrode sheet for a battery according to claim 6, wherein the step of adding polytetrafluoroethylene and carboxyl-modified styrene-butadiene rubber to the negative electrode slurry, stirring, and forming a gel layer including polytetrafluoroethylene and carboxyl-modified styrene-butadiene rubber over the negative electrode slurry, comprises the steps of:
adding polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber into the negative electrode slurry, controlling the stirring speed to be 200-400r/min, stirring for 10-30min, transferring the slurry into a slurry pulling furnace, controlling the liquid level to be 12-18cm, standing for 5-30min, and forming a glue layer comprising polytetrafluoroethylene and carboxyl modified styrene-butadiene rubber above the negative electrode slurry.
9. The method for preparing a negative electrode sheet for a battery according to claim 6, wherein the tape speed of the substrate is 2.0-3.5m/min; the temperature of the pulp pulling is 85-135 ℃, and the pulp is dried in a temperature region.
10. A nickel-metal hydride battery comprising a positive electrode sheet, an electrolyte, a separator, and the negative electrode sheet according to any one of claims 1 to 5.
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