CN112803006B - Positive lead paste for prolonging service life of lead-acid storage battery and preparation method thereof - Google Patents
Positive lead paste for prolonging service life of lead-acid storage battery and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/56—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of lead
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/06—Lead-acid accumulators
- H01M10/12—Construction or manufacture
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- 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
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Abstract
The invention discloses a positive lead plaster for prolonging the service life of a lead-acid storage battery and a preparation method thereof, belonging to the technical field of storage batteries, wherein the positive lead plaster is prepared from the following components: the preparation method of the lead powder, the sulfuric acid solution, the short fibers, the acetylene black, the water, the polytetrafluoroethylene emulsion, the nano silicon dioxide and the bismuth trioxide comprises the following steps: s1: soaking short fibers in a hydrochloric acid solution with the mass fraction of 10% for 4 hours, then washing with water, and drying to obtain pretreated short fibers; s2: mixing the pretreated short fibers with lead powder, acetylene black, nano silicon dioxide and bismuth trioxide in a mixer to obtain a first mixture; s3: placing the mixture I in a stirrer, adding polytetrafluoroethylene emulsion and water, and stirring for 30min to obtain a mixture II; s4: and adding a sulfuric acid solution into the mixture II, and stirring for 5 min. According to the invention, through the synergistic effect of the components, the bonding force between the lead plaster and the grid is effectively reduced, the falling of the positive lead plaster is reduced, and the cycle service life of the battery is prolonged.
Description
Technical Field
The invention relates to the technical field of storage batteries, in particular to positive lead paste for prolonging the service life of a lead-acid storage battery and a preparation method thereof.
Background
Lead-acid batteries have a long history, and have the advantages of low manufacturing cost, simple design, high reliability, relative safety, and the like. The lead-acid storage battery is widely applied to occasions such as automobile starting, traction power of forklifts, ships and the like, power of electric bicycles, power of electric tools, fixed energy storage, illumination and the like due to relatively good specific power characteristics. The lead-acid storage battery mainly comprises a positive plate, a negative plate, a diaphragm and electrolyte. The early capacity loss and the softening and falling of the active substance of the positive electrode are the root causes influencing the service life of the battery, particularly the deep cycle service life for power, and the performance of the active substance of the positive electrode can directly influence the specific capacity characteristic of the battery, so the problem of the active substance of the positive electrode is solved, and the active substance plays a vital role in prolonging the service life of the battery, developing the lead-acid battery industry and fully utilizing social resources.
Patent document with publication number CN106384821A discloses a lead paste for the positive electrode of a lead-acid storage battery, belonging to the technical field of lead-acid storage battery manufacturing. The lead-acid storage battery positive electrode lead plaster is prepared from lead powder, sulfuric acid, water, short fibers, sodium perborate, sodium pyroantimonate, red lead and titanium suboxide. The lead-acid storage battery positive electrode lead plaster is added with effective components such as sodium perborate, red lead, titanium dioxide conductive ceramic materials and the like besides lead powder, sulfuric acid, water and short fiber components, so that the assembled lead-acid storage battery keeps the shape and the porosity of a hole in the charging and discharging process, a positive electrode active substance has higher formability and the utilization rate of the active substance, and has larger capacity in high-rate discharging, and the network structure of the positive electrode active substance is stable; can increase the early capacity of the battery, prevent the early capacity of the battery from fading, and simultaneously obviously reduce the hydrogen evolution potential of the battery.
Patent document CN108428891A discloses a novel high-capacity lead-acid battery positive lead paste and a preparation method thereof. Lead powder, titanium dioxide accounting for 0.1-0.7% of the lead powder by mass, SiO2 accounting for 0.3-1.1% of the lead powder by mass and polyester staple fiber accounting for 0.75% of the lead powder by mass are dry-mixed, distilled water accounting for 13.8% of the lead powder by mass is added for wet mixing, sulfuric acid accounting for 10.5% of the lead powder by mass is added, and the mixture is uniformly stirred. The obtained positive lead paste obviously increases the conductivity, mechanical strength and acid absorption value of the positive plate, reduces the oxygen precipitation potential and the fineness of active substances of the positive plate and improves the formation efficiency of the plate under the interaction between titanium oxide, SiO2 and the like.
The two lead pastes have no obvious effect on improving the cycle performance of the battery by improving the utilization rate of the positive active material.
Disclosure of Invention
In view of the above, the invention provides a positive electrode lead paste for prolonging the service life of a lead-acid storage battery and a preparation method thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the positive lead plaster for prolonging the service life of the lead-acid storage battery is prepared from the following components: lead powder, sulfuric acid solution, short fibers, acetylene black, water, polytetrafluoroethylene emulsion, nano silicon dioxide and bismuth trioxide.
Further, the positive lead plaster for prolonging the service life of the lead-acid storage battery is prepared from the following components in parts by weight: 20-30 parts of lead powder, 3-5 parts of sulfuric acid solution, 0.02-0.035 part of short fiber, 0.15-0.28 part of acetylene black, 4.5-7 parts of water, 0.012-0.025 part of polytetrafluoroethylene emulsion, 0.03-0.05 part of nano silicon dioxide and 0.01-0.02 part of bismuth trioxide.
Further, the positive lead plaster for prolonging the service life of the lead-acid storage battery is prepared from the following components in parts by weight: 22-28 parts of lead powder, 3.5-4.8 parts of sulfuric acid solution, 0.022-0.03 part of short fiber, 0.18-0.25 part of acetylene black, 5-6.5 parts of water, 0.015-0.023 part of polytetrafluoroethylene emulsion, 0.035-0.048 part of nano silicon dioxide and 0.012-0.018 part of bismuth trioxide.
Further, the sulfuric acid solution is a 40% sulfuric acid aqueous solution in mass fraction.
Furthermore, the short fiber is carbon fiber, polyacrylonitrile fiber and aramid fiber.
Further, in the short fiber, the mass ratio of each component is as follows: carbon fiber: polyacrylonitrile fiber: the aramid fiber is 1:0.2-0.5: 0.05-0.1.
Further, the short fiber has a length of 1-3mm and a diameter of 100-200 μm.
Further, the preparation method of the positive lead plaster for prolonging the service life of the lead-acid storage battery comprises the following steps:
s1: soaking short fibers in a hydrochloric acid solution with the mass fraction of 10% for 4h, then washing with water until the pH =7, and drying to obtain pretreated short fibers;
s2: mixing the pretreated short fibers obtained in the step S1 with lead powder, acetylene black, nano silicon dioxide and bismuth trioxide in a mixer for 10min to obtain a first mixture;
s3: placing the mixture I obtained in the step S2 in a stirrer, adding polytetrafluoroethylene emulsion and water, and stirring at the rotating speed of 200r/min for 30min at normal temperature to obtain a mixture II;
s4: and (5) adding a sulfuric acid solution into the mixture II obtained in the step (S3), keeping the rotation speed unchanged, and stirring for 5 min.
Due to the increasing prominence of energy crisis and environmental pollution, global attention is being focused more and more on sustainable and renewable power resources and energy storage systems. The lead-acid storage battery has the advantages of mature process, good safety performance, low cost, stable performance, high resource recycling rate and the like, and still has great market share so far. The formula of the traditional lead-acid storage battery positive lead plaster is that lead powder, sulfuric acid, water, short fiber, graphite and other additives are mixed according to a certain proportion. When the lead-acid storage battery is charged, the anode is converted into lead dioxide, the concentration of sulfuric acid in the electrolyte is increased, and energy is stored; when the lead-acid storage battery discharges, the positive active substance is converted into lead sulfate, the concentration of the sulfuric acid in the electrolyte is reduced, and the storage and release of the capacity are realized in the repeated charging and discharging processes of the lead-acid storage battery. However, as the lead-acid battery is repeatedly cycled during charging and discharging, the volume of lead sulfate generated during discharging increases, which can lead to softening and falling of the positive lead paste. In order to solve the problem of softening and dropping of the positive electrode lead paste, a method of adding a large amount of 4BS is generally adopted, and the problem is solved by forming more positive electrode active material PbO2 in the formation stage. However, the addition of a large amount of 4BS requires high-temperature curing, which leads to an increase in cost and difficulty in battery formation. Patent document with publication number CN109256560A discloses a positive lead plaster for improving high-temperature cycle life of lead-acid storage battery and a preparation method thereof, belonging to the technical field of starting lead-acid storage battery. The starting type lead-acid storage battery SAE J2801 mainly solves the problem that the cycle life of the existing starting type lead-acid storage battery SAE J2801 is shorter than 15 units. It is mainly characterized in that: the positive lead plaster formula comprises: 78.2 to 80.2 percent of lead powder; 2.6 to 2.7 percent of red lead; short fiber 0.05-0.06%; 0.09% -1.00% of organic binder; 0.02% -0.05% of an interface improver; 7.0 to 7.5 percent of dilute sulfuric acid; 10.0 to 10.5 percent of pure water. The method reduces the corrosion rate of the positive grid by reducing the water loss rate and improves the cycle life of the battery. Patent document with publication number CN112290017A discloses a lead-acid battery positive lead plaster, a preparation method thereof and a lead-acid battery, belonging to the technical field of storage batteries and aiming at solving the problems of difficult formation of the existing positive lead plaster, specific energy of positive active substances and short service life of the lead-acid battery. The positive lead plaster of the lead-acid storage battery comprises the following components in parts by weight: 1000 parts of lead powder, 120-140 parts of dilute sulfuric acid, 3-6 parts of graphene, 1-3 parts of carbon fiber, 1-3 parts of tetrabasic lead sulfate, 20-40 parts of red lead, 0.6-1.5 parts of short fiber, 0.05-2 parts of stannous sulfate, 0.1-3 parts of filler, 0.2-2 parts of silane coupling agent and 135-160 parts of water. The preparation method comprises the steps of dry mixing lead powder, graphene, carbon fibers, tetrabasic lead sulfate, red lead, short fibers, stannous sulfate and a filler to obtain a dry mixture; fully stirring water and a silane coupling agent, adding the water and the silane coupling agent into the dry mixture, and wet mixing to obtain a wet mixed material; and slowly adding dilute sulfuric acid into the wet mixed material, stirring, and obtaining the lead paste of the positive electrode of the lead-acid storage battery. The method improves the service life of the lead-acid storage battery by improving the specific energy of the positive active material. However, this method still cannot solve the problem of the falling of the positive electrode lead paste.
The invention has the beneficial effects that: in the invention, the acetylene black enhances the conductivity and mechanical strength of the lead paste. The nano silicon dioxide improves the electrochemical performance, improves the utilization rate of active substances and improves the output power of the battery. The polypropylene fiber has good elasticity, good heat resistance and high strength, and the aramid fiber has the characteristics of high strength, high modulus, high temperature resistance, acid and alkali resistance, ageing resistance and the like; the carbon fiber has high temperature resistance, good conductivity and high specific modulus. The composite lead paste is compounded with the nano silicon dioxide, and a dense grid structure is formed on the surface of the lead paste, so that the conductive capacity is improved, the tensile strength is improved, the cracking of the lead paste can be obviously reduced, and the cycle life of a battery is prolonged. The bismuth trioxide is beneficial to improving the binding force of the active substance and the grid, improving the deep discharge performance, prolonging the cycle life and slowing down the capacity attenuation. The polytetrafluoroethylene emulsion enhances the binding force of the lead plaster and the grid, and simultaneously enhances the compatibility among all components and maintains the stability of the system. According to the invention, through the synergistic effect of the components, the bonding force between the lead plaster and the grid is effectively reduced, the falling of the positive lead plaster is reduced, and the cycle service life of the battery is prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described below. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Example 1
The positive lead plaster for prolonging the service life of the lead-acid storage battery is prepared from the following components in parts by weight: 20 parts of lead powder, 3 parts of sulfuric acid solution, 0.02 part of short fiber, 0.15 part of acetylene black, 4.5 parts of water, 0.012 part of polytetrafluoroethylene emulsion, 0.03 part of nano silicon dioxide and 0.01 part of bismuth trioxide.
The sulfuric acid solution is a 40% sulfuric acid aqueous solution in mass fraction.
In the short fiber, the mass ratio of each component is as follows: carbon fiber: polyacrylonitrile fiber: the aramid fiber is 1:0.2: 0.05.
The short fiber has a length of 1-3mm and a diameter of 100-200 μm.
Example 2
The positive lead plaster for prolonging the service life of the lead-acid storage battery is prepared from the following components in parts by weight: 22 parts of lead powder, 3.5 parts of sulfuric acid solution, 0.022 part of short fiber, 0.18 part of acetylene black, 5 parts of water, 0.015 part of polytetrafluoroethylene emulsion, 0.035 part of nano silicon dioxide and 0.012 part of bismuth trioxide.
The sulfuric acid solution is a 40% sulfuric acid aqueous solution in mass fraction.
In the short fiber, the mass ratio of each component is as follows: carbon fiber: polyacrylonitrile fiber: the aramid fiber is 1:0.3: 0.06.
The short fiber has a length of 1-3mm and a diameter of 100-200 μm.
Example 3
The positive lead plaster for prolonging the service life of the lead-acid storage battery is prepared from the following components in parts by weight: 25 parts of lead powder, 4.2 parts of sulfuric acid solution, 0.028 parts of short fibers, 0.21 part of acetylene black, 5.8 parts of water, 0.019 part of polytetrafluoroethylene emulsion, 0.04 part of nano silicon dioxide and 0.015 part of bismuth trioxide.
The sulfuric acid solution is a 40% sulfuric acid aqueous solution in mass fraction.
In the short fiber, the mass ratio of each component is as follows: carbon fiber: polyacrylonitrile fiber: the aramid fiber is 1:0.4: 0.07.
The short fiber has a length of 1-3mm and a diameter of 100-200 μm.
Example 4
The positive lead plaster for prolonging the service life of the lead-acid storage battery is prepared from the following components in parts by weight: 28 parts of lead powder, 4.8 parts of sulfuric acid solution, 0.03 part of short fiber, 0.25 part of acetylene black, 6.5 parts of water, 0.023 part of polytetrafluoroethylene emulsion, 0.048 part of nano silicon dioxide and 0.018 part of bismuth trioxide.
The sulfuric acid solution is a 40% sulfuric acid aqueous solution in mass fraction.
In the short fiber, the mass ratio of each component is as follows: carbon fiber: polyacrylonitrile fiber: the aramid fiber is 1:0.5: 0.08.
The length of the short fiber is 1-3mm, and the diameter is 100-200 mu m.
Example 5
The positive lead plaster for prolonging the service life of the lead-acid storage battery is prepared from the following components in parts by weight: 30 parts of lead powder, 5 parts of sulfuric acid solution, 0.035 part of short fiber, 0.28 part of acetylene black, 7 parts of water, 0.025 part of polytetrafluoroethylene emulsion, 0.05 part of nano silicon dioxide and 0.02 part of bismuth trioxide.
The sulfuric acid solution is a 40% sulfuric acid aqueous solution in mass fraction.
In the short fiber, the mass ratio of each component is as follows: carbon fiber: polyacrylonitrile fiber: the ratio of the aramid fiber to the aramid fiber is 1:0.5: 0.1.
The short fiber has a length of 1-3mm and a diameter of 100-200 μm.
In examples 1-5, the method for preparing positive electrode lead paste for improving the service life of a lead-acid storage battery comprises the following steps:
s1: soaking short fibers in a hydrochloric acid solution with the mass fraction of 10% for 4h, then washing with water until the pH =7, and drying to obtain pretreated short fibers;
s2: mixing the pretreated short fibers obtained in the step S1 with lead powder, acetylene black, nano silicon dioxide and bismuth trioxide in a mixer for 10min to obtain a first mixture;
s3: placing the mixture I obtained in the step S2 in a stirrer, adding polytetrafluoroethylene emulsion and water, and stirring at the rotating speed of 200r/min for 30min at normal temperature to obtain a mixture II;
s4: and (5) adding a sulfuric acid solution into the mixture II obtained in the step (S3), keeping the rotation speed unchanged, and stirring for 5 min.
Example 6
A positive electrode lead plaster for improving the service life of a lead-acid storage battery is the same as example 3, but is different from example 3 in that 0.01 part by weight of xanthan gum is added in the example, and the xanthan gum is added together with polytetrafluoroethylene emulsion in the preparation method.
Example 7
A positive electrode lead plaster for improving the service life of a lead-acid storage battery is the same as example 3, but is different from example 3 in that 0.012 parts by weight of xanthan gum is added in the example, and the xanthan gum is added together with polytetrafluoroethylene emulsion in the preparation method.
In examples 3 to 7, the polypropylene fibers in the short fibers were modified polypropylene fibers by the following method:
1. soaking polypropylene fibers in acetone for 4 hours, then washing with water, and drying;
2. placing into soaking solution, and irradiating under ultraviolet lamp for 2 min;
3. and washing with acetone, washing with water until the pH value is 7, and drying to obtain the modified polypropylene fiber.
The soaking solution is 10% by mass of acrylic acid aqueous solution and benzophenone, and the weight ratio of the acrylic acid aqueous solution to the benzophenone is 50: 0.3.
The carbon fiber is modified carbon fiber, and the modification method comprises the following steps: soaking carbon fibers in 5% nitric acid aqueous solution for 2 hours, then soaking in mixed solution of a silane coupling agent KH550 and water for 4 hours, and drying to obtain the carbon fibers, wherein the weight ratio of the silane coupling agent KH550 to the water is 1: 30.
The aramid fiber is modified aramid fiber, and the modification method comprises the following steps: adding aramid fiber into an LiCl ethanol solution with the weight percentage of 8%, heating in a water bath at 75 ℃ for 2h, washing with water, and drying.
The modified polypropylene fiber increases the surface wettability and improves the dispersibility; the modified carbon fiber increases the adhesive property with polytetrafluoroethylene emulsion and enhances the bonding property between lead plaster and a grid; the surface roughness and the bonding property of the modified aramid fiber are increased, so that the charge retention capacity and the cycle life of the battery are improved. The xanthan gum is added in the embodiments 6 and 7, which is beneficial to improving the utilization rate of lead powder, can keep stable and play a role in the cycle life of the lead-acid storage battery, and improves the cycle life of the lead-acid storage battery.
Comparative example 1
A positive electrode lead paste for improving the life of a lead-acid battery is similar to example 1, but is different from example 1 in that short fibers are absent.
Comparative example 2
The positive electrode lead paste for prolonging the service life of the lead-acid storage battery is the same as the positive electrode lead paste in the embodiment 1, but is different from the positive electrode lead paste in the embodiment 1 in that nano silicon dioxide is absent.
Comparative example 3
A positive electrode lead paste for improving the life of a lead-acid battery is similar to example 1, but unlike example 1, bismuth trioxide is absent in this example.
The positive electrode lead paste of the present invention was used for producing a lead-acid storage battery 6-CN-200 with reference to a conventional method.
Battery testing method
The lead-acid storage battery to be tested is subjected to the following tests on the battery performance according to the test method and standard of GB/T22473-2008, and the test results are shown in Table 1.
TABLE 1 Battery test results
| Charge retention (%) | Cyclic durability (%) | |
| Example 1 | 90.2 | 85.5 |
| Example 2 | 90.3 | 85.6 |
| Example 3 | 91.5 | 86.1 |
| Example 4 | 91.5 | 86.2 |
| Example 5 | 91.4 | 86.1 |
| Example 6 | 92.1 | 88.9 |
| Example 7 | 92.2 | 89.1 |
| Comparative example 1 | 85.7 | 83.4 |
| Comparative example 2 | 85.8 | 84.2 |
| Comparative example 3 | 87 | 80.1 |
The charge retention capacity and the cycle endurance of the storage batteries of the examples and the comparative examples are tested by combining the table 1, the fully charged lead-acid storage battery is stored for 28 days at an open circuit at the ambient temperature of 25 +/-2 ℃, the residual capacity after storage reaches over 90 percent of the actual capacity of 10h rate, and the actual capacity is over 85 percent of the rated capacity after the cycle endurance test and the third stage test. The short fibers in the examples 3 to 7 are modified, so that the performance is improved, and the xanthan gum is added in the examples 6 and 7, so that the comprehensive performance is optimal. Comparative example 1 lacks short fibers, comparative example 2 lacks nano-silica, comparative example 3 lacks bismuth trioxide, and the charge retention capacity and cycle durability of the battery are reduced to various degrees.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (4)
1. The utility model provides an improve anodal lead plaster of lead acid battery life-span which characterized in that: the composition is prepared from the following components in parts by weight: 20-30 parts of lead powder, 3-5 parts of sulfuric acid solution, 0.02-0.035 part of short fiber, 0.15-0.28 part of acetylene black, 4.5-7 parts of water, 0.012-0.025 part of polytetrafluoroethylene emulsion, 0.03-0.05 part of nano silicon dioxide and 0.01-0.02 part of bismuth trioxide;
the short fiber is carbon fiber, polyacrylonitrile fiber and aramid fiber; the mass ratio of each component is as follows: carbon fiber: polyacrylonitrile fiber: the aramid fiber is 1:0.2-0.5: 0.05-0.1;
the polypropylene fiber is modified polypropylene fiber, and the modification method comprises the following steps:
1. soaking polypropylene fibers in acetone for 4 hours, then washing with water, and drying;
2. placing into soaking solution, and irradiating under ultraviolet lamp for 2 min;
3. washing with acetone, washing with water until the pH value is 7, and drying to obtain the modified polypropylene fiber;
the soaking solution is 10% by mass of acrylic acid aqueous solution and benzophenone, and the weight ratio of the acrylic acid aqueous solution to the benzophenone is 50: 0.3;
the carbon fiber is modified carbon fiber, and the modification method comprises the following steps: soaking carbon fibers in 5% nitric acid aqueous solution for 2 hours, then soaking in mixed solution of a silane coupling agent KH550 and water for 4 hours, and drying to obtain the carbon fibers, wherein the weight ratio of the silane coupling agent KH550 to the water is 1: 30;
the aramid fiber is modified aramid fiber, and the modification method comprises the following steps: adding aramid fiber into an LiCl ethanol solution with the weight percentage of 8%, heating in a water bath at 75 ℃ for 2h, washing with water, and drying;
the preparation method of the positive lead plaster for prolonging the service life of the lead-acid storage battery comprises the following steps:
s1: soaking short fibers in a hydrochloric acid solution with the mass fraction of 10% for 4 hours, then washing with water until the pH value is 7, and drying to obtain pretreated short fibers;
s2: mixing the pretreated short fibers obtained in the step S1 with lead powder, acetylene black, nano silicon dioxide and bismuth trioxide in a mixer for 10min to obtain a first mixed material;
s3: placing the mixture I obtained in the step S2 in a stirrer, adding polytetrafluoroethylene emulsion and water, and stirring at the rotating speed of 200r/min for 30min at normal temperature to obtain a mixture II;
s4: and (5) adding a sulfuric acid solution into the mixture II obtained in the step (S3), keeping the rotation speed unchanged, and stirring for 5 min.
2. The positive electrode lead paste for improving the service life of a lead-acid storage battery as claimed in claim 1, wherein: the composition is prepared from the following components in parts by weight: 22-28 parts of lead powder, 3.5-4.8 parts of sulfuric acid solution, 0.022-0.03 part of short fiber, 0.18-0.25 part of acetylene black, 5-6.5 parts of water, 0.015-0.023 part of polytetrafluoroethylene emulsion, 0.035-0.048 part of nano silicon dioxide and 0.012-0.018 part of bismuth trioxide.
3. The positive electrode lead paste for improving the service life of a lead-acid storage battery as claimed in claim 2, wherein: the sulfuric acid solution is a 40% sulfuric acid aqueous solution in mass fraction.
4. The positive electrode lead paste for improving the service life of a lead-acid storage battery as claimed in claim 3, wherein: the short fiber has a length of 1-3mm and a diameter of 100-200 μm.
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|---|---|---|---|---|
| CN105140511A (en) * | 2015-06-29 | 2015-12-09 | 武汉非凡电源有限公司 | Positive lead paste of lead-acid storage battery pole plate for deep circulation |
| CN105140573B (en) * | 2015-09-28 | 2016-05-25 | 骆驼集团蓄电池研究院有限公司 | A kind of maintenance-free lead accumulator and preparation method thereof |
| CN107403934B (en) * | 2017-08-27 | 2020-09-18 | 山东金科力电源科技有限公司 | Short fiber for lead-acid storage battery plate |
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2021
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