A positive plate paste for high specific energy long life lead-acid batteries, a method for making the same and lead-acid batteries made therefrom

Abstract

The application discloses a kind of high specific energy long life lead-acid battery positive plate lead paste in the technical field of lead-acid battery, it is characterized in that, by weight component includes: lead oxide powder 600 parts, 80~120 parts of tetrabasic lead sulfate, 100~140 parts of lead sulfate, 200~300 parts of deionized water, thickening agent 4~6 parts, 30% alkaline nano-silica aqueous solution 30~36 parts, 5~10 parts of lead dioxide, 0.5~1.5 parts of short fiber, 0.2~0.4 parts of magnesium sulfate, 0.5~2 parts of stannous sulfate, 0.5~1 parts of antimony trioxide, 1~3 parts of mixed carbon material, the application promotes performance by component cooperation, innovative preparation process, not only significantly improve the energy density and cycle life of battery, and preparation process whole process is no exothermic reaction, lead paste effective component is stable, without using high-temperature curing, reduce production cost, simple and controllable process.

Description

Technical Field

[0001] This invention relates to the field of lead-acid battery technology, and particularly to a lead paste and a lead-acid battery. Background Technology

[0002] Lead-acid batteries occupy an important position in the secondary power market due to their advantages such as low cost, high reliability, and well-established recycling system. However, with the rapid development of energy storage, electric vehicles and other fields, higher requirements have been placed on the energy density and cycle life of lead-acid batteries. At the same time, stringent standards have been set for the safety and cost controllability of the production process.

[0003] Existing cathode lead paste technologies mostly use lead powder as the core active component, simply adding a small amount of tetrabasic lead sulfate. They do not employ a "lead oxide powder + tetrabasic lead sulfate + lead sulfate + lead dioxide" component to improve performance. Innovative preparation processes result in low utilization of active materials and poor lead paste stability, leading to a loose structure that is prone to powdering and detachment. Battery energy densities are generally around 40Wh / kg, with a cycle life as low as 500 cycles, failing to meet the demands of high-end applications. The preparation of cathode lead paste requires the addition of sulfuric acid solution as a mixing medium. The reaction between sulfuric acid and lead powder (or lead oxide powder) produces a violent exothermic reaction (reaction temperatures can reach above 80℃), which not only easily leads to the decomposition of effective components and reduced activity in the lead paste, but also requires dedicated cooling equipment to control the reaction temperature, increasing investment in production equipment. Simultaneously, the exothermic reaction results in poor process controllability, easily leading to uneven lead paste consistency and large performance fluctuations. Subsequent high-temperature curing processes (60-85℃) are needed to stabilize the lead paste structure, further increasing energy consumption and production costs. The current lead paste composition does not utilize combinations of lead oxide powder, tetrabasic lead sulfate, or lead sulfate and lead dioxide, failing to balance the reactivity and structural stability of the active materials. Mixed carbon materials are often single-carbon materials (such as single graphene or acetylene black), resulting in poor conductivity and dispersibility, thus failing to fully improve the conductivity of the lead paste. Furthermore, the lack of synergistic combination of 30% alkaline nano-silica aqueous solution and thickener makes it difficult to form a stable lead paste network structure, easily leading to problems such as lead paste delamination and active material shedding. The current lead paste preparation process is the traditional "dry mixing - adding water, adding sulfuric acid to form a paste - cooling - high-temperature curing" process, which cannot solve a series of problems caused by exothermic reactions and lacks process innovation. Moreover, the existing process is not adapted to the characteristics of active components in a sulfuric acid-free system, resulting in uneven mixing and poor performance stability of the lead paste, failing to meet the consistency requirements of large-scale production. Therefore, a high-energy-density, long-life lead-acid battery positive plate lead paste, its preparation method, and a lead-acid battery are needed to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-energy-density, long-life lead-acid battery positive plate lead paste and its preparation method, as well as a lead-acid battery. The core innovation of this invention lies in the fact that the paste is not made with sulfuric acid solution. Instead, a combination of lead oxide powder, tetrabasic lead sulfate, lead sulfate, and lead dioxide replaces the original single lead oxide powder. Performance is improved through component combination. The innovative preparation process not only significantly improves the energy density and cycle life of the battery, but also has no exothermic reaction throughout the preparation process. The effective components of the lead paste are stable, eliminating the need for high-temperature curing, reducing production costs, and making the process simple and controllable.

[0005] The objective of this invention is achieved as follows:

[0006] A high-energy-density, long-life lead-acid battery positive plate paste, comprising the following components by weight:

[0007] 600 parts lead oxide powder, 80-120 parts tetrabasic lead sulfate, 100-140 parts lead sulfate, 200-300 parts deionized water, 4-6 parts thickener, 30-36 parts 30% alkaline nano silica aqueous solution, 5-10 parts lead dioxide, 0.5-1.5 parts short fiber, 0.2-0.4 parts magnesium sulfate, 0.5-2 parts stannous sulfate, 0.5-1 parts antimony trioxide, and 1-3 parts mixed carbon materials.

[0008] Furthermore, the lead oxide powder has a particle size ≤5μm, an oxidation degree of 72~76%, and an apparent specific gravity of 1.5~1.7g / cm³; the weight ratio of tetrabasic lead sulfate to lead sulfate is 0.6~1.2:1.

[0009] Furthermore, the thickener is a compound of sodium carboxymethyl cellulose and polytetrafluoroethylene emulsion, with a weight ratio of 3:1 to 4:1; the pH value of the 30% alkaline nano silica aqueous solution is 8 to 10, and the particle size of the nano silica is 50 to 100 nm.

[0010] Furthermore, the mixed carbon material is prepared by mixing graphene and acetylene black in a mass ratio of 1:2~3, with the graphene particle size being 5~10nm and the acetylene black particle size being 35~45μm; the short fiber is polyester short fiber with a length of 1~3mm.

[0011] A method for preparing lead paste for the positive electrode plate of a high-energy-density, long-life lead-acid battery includes the following steps:

[0012] S1. Dry mixing preparation of dry mixture: Add lead oxide powder, tetrabasic lead sulfate, lead sulfate, lead dioxide, short fiber, magnesium sulfate, stannous sulfate, antimony trioxide and mixed carbon materials into a mixer and dry mix at 200~300 rpm for 15~25 min to obtain dry mixture;

[0013] S2. Preparation of thickener aqueous solution: Take deionized water, heat it to 40~60℃, slowly add the thickener while stirring at a constant temperature, stir at a speed of 300~400rpm for 20~30min until the thickener is completely dissolved to obtain thickener aqueous solution;

[0014] S3. Paste preparation and discharge: Slowly add the thickener aqueous solution prepared in step S2 to the dry mixture obtained in step S1, stir at 350~450 rpm for 10~20 min, then slowly add 30% alkaline nano silica aqueous solution, continue stirring for 20~30 min, and discharge the paste to obtain high specific energy long life lead-acid battery positive plate lead paste.

[0015] Furthermore, in step S3, the feeding rate of both the thickener aqueous solution and the 30% alkaline nano silica aqueous solution is 20~30L / min.

[0016] A high-energy-density, long-life lead-acid battery includes a positive plate, a negative plate, a separator, an electrolyte, and a casing. The positive plate is made by curing and drying a positive plate grid and a high-energy-density, long-life lead-acid battery positive plate paste coated on its surface.

[0017] Furthermore, lead paste is directly applied to the surface of the positive electrode grid, and the positive electrode plate is obtained by curing and drying at room temperature. The room temperature curing conditions are: curing at 25~35℃ and 60%~70% humidity for 12~24 hours; the drying conditions are: drying at 55~75℃ and 5%~25% humidity for 12~24 hours.

[0018] The above technical solution has the following innovative features:

[0019] 1. This invention eliminates the need for sulfuric acid solution, achieving a non-exothermic paste bonding process and completely resolving the core pain points of existing technologies. Current production technologies all use sulfuric acid solution as the bonding medium, inevitably leading to an exothermic reaction. This invention, however, completely eliminates the need for sulfuric acid solution, innovatively using a mixture of "thickener aqueous solution + 30% alkaline nano-silica aqueous solution" to replace sulfuric acid as the bonding medium. This process eliminates the need for exothermic reactions throughout, requiring no cooling equipment or high-temperature curing processes, significantly reducing production costs. Simultaneously, it avoids the decomposition of effective components caused by sulfuric acid, enhancing the activity of the lead paste and breaking the dependence of existing paste bonding processes on sulfuric acid.

[0020] 2. This invention innovatively uses a combination of lead oxide powder, tetrabasic lead sulfate, lead sulfate, and lead dioxide as raw materials to replace the original single lead oxide powder preparation process. The weight ratio of tetrabasic lead sulfate to lead sulfate is 0.6~1.2:1. Combined with a compound thickener, mixed carbon materials, and multi-component auxiliary additives, it forms a comprehensive synergistic effect: effectively improving the utilization rate of active materials, the mixed carbon materials improve conductivity, the compound thickener and alkaline nano silica synergistically improve the stability of lead paste, and the multi-component auxiliary additives inhibit corrosion and promote active conversion, which can significantly improve the energy density and cycle life of the battery.

[0021] 3. Optimized preparation process and adapted to sulfuric acid-free systems, achieving simple, controllable, and large-scale production. This invention optimizes the dry mixing, feeding sequence, and stirring parameters, adopting an innovative process of "dry mixing - preparation of thickener aqueous solution - step-by-step liquid addition and paste formation - room temperature curing." This eliminates the need for complex equipment, making the process simple and controllable, avoiding the cumbersome process of "sulfuric acid paste formation - cooling - high-temperature curing" found in existing processes. Simultaneously, the process ensures uniform mixing and stable performance of the lead paste, increases production efficiency by over 35%, and provides good product consistency, meeting the needs of large-scale production. It is highly practical and solves the problems of complex and poorly controllable existing production processes.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. Significantly improved energy density:

[0024] The energy density of the battery produced by this invention is increased to about 48Wh / kg, which is 20% higher than that of existing products (normally 40Wh / kg). This meets the energy requirements of high-end energy storage, electric vehicles and other scenarios and has significant technical advantages. In particular, it can still maintain high activity in the sulfuric acid-free system, which solves the problem of insufficient activity in existing sulfuric acid-free solutions. This is a technical effect that existing patents cannot achieve.

[0025] 2. Significantly extended cycle life:

[0026] The lead paste for the positive electrode plate of the lead-acid battery of the present invention and its preparation method can effectively inhibit lead paste powdering, shedding and electrode plate corrosion. Under 100% DOD deep cycle conditions, the battery has a cycle life of ≥800 cycles, far exceeding the current conventional products of about 500 cycles, and the service life is increased by more than 60%, solving the core pain point of short deep cycle life of existing batteries.

[0027] 3. Production costs are significantly reduced:

[0028] The preparation process involves no sulfuric acid or exothermic reaction, eliminating the need for cooling equipment and high-temperature curing processes, thus reducing energy consumption. At the same time, the effective components of the lead paste are stable, resulting in reduced losses, improved raw material utilization, and lower overall production costs. Compared with existing technology products, it has a significant cost advantage.

[0029] 4. Simple and controllable process, high safety:

[0030] The entire process involves no exothermic reaction, maintains a stable reaction temperature, and produces lead paste with good uniformity and minimal performance fluctuations. It requires no complex equipment, has a simple process, and does not require the addition of sulfuric acid, significantly improving production safety and resolving safety hazards and poor process control in existing production processes. The room temperature curing process further simplifies the process, reduces energy consumption, and can be used on existing production lines without requiring equipment modifications.

[0031] 5. Lead paste has strong stability and good practicality:

[0032] Through the synergistic effect of compound thickener and 30% alkaline nano silica aqueous solution, the lead paste has a dense structure, no layering or clumping, high mechanical strength, and strong resistance to powdering. It is compatible with conventional negative electrode plates, electrolytes, and separators, and can be directly connected to existing production lines without the need for modification of existing production equipment, making it highly practical. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0034] Figure 1 This is a capacity discharge curve diagram of Embodiment 1 and the comparative example of the present invention.

[0035] Figure 2 This is a comparison curve of cycle life between Embodiment 1 and the comparative example of the present invention.

[0036] Figure 3 This is a diagram showing the state of the positive electrode plate prepared in Example 1 of the present invention after curing at room temperature. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] A high-energy-density, long-life lead-acid battery positive plate paste comprises, by weight: 600 parts lead oxide powder, 100 parts tetrabasic lead sulfate, 120 parts lead sulfate, 250 parts deionized water, 5 parts thickener (sodium carboxymethyl cellulose: polytetrafluoroethylene emulsion = 3.5:1), 33 parts 30% alkaline nano silica aqueous solution (pH = 9, nano silica particle size 75nm), 7.5 parts lead dioxide, 1.0 part short fiber (polyester short fiber, length 2mm), 0.3 parts magnesium sulfate, 1.25 parts stannous sulfate, 0.75 parts antimony trioxide, and 2 parts mixed carbon material (graphene: acetylene black = 1:2.5).

[0040] A method for preparing a high-energy-density, long-life lead-acid battery includes the following steps:

[0041] S1. Dry mixing preparation of dry mixture: Add the above lead oxide powder, tetrabasic lead sulfate, lead sulfate, lead dioxide, short fiber, magnesium sulfate, stannous sulfate, antimony trioxide and mixed carbon materials into a mixer, and dry mix at 250 rpm for 20 min to obtain a uniform dry mixture;

[0042] S2. Preparation of thickener aqueous solution: Take 250 parts of deionized water, heat to 50℃, slowly add 5 parts of thickener under constant temperature and stirring, stir at 350 rpm for 25 minutes until the thickener is completely dissolved to obtain thickener aqueous solution;

[0043] S3. Paste preparation and discharge: Slowly add the thickener aqueous solution to the dry mixture at a speed of 25L / min, stir at 400rpm for 15min, then add 33 parts of 30% alkaline nano silica aqueous solution at a speed of 25mL / min, and continue stirring for 25min to form a uniform and fine lead paste, and discharge the paste.

[0044] S4. Preparation of positive electrode plate: The above lead paste is coated on the surface of the positive electrode alloy grid with a coating thickness of 2.0 mm. It is cured at room temperature for 18 h at 30℃ and 65% humidity, and then dried at 65℃ and 15% humidity for 18 h to obtain the positive electrode plate.

[0045] S5. Battery assembly: The above-mentioned positive plates, AGM separators and conventional negative plates are stacked alternately, installed in an ABS shell, and injected with conventional sulfuric acid electrolyte. After formation, a lead-acid battery is obtained.

[0046] Example 2

[0047] A high-energy-density, long-life lead-acid battery positive plate paste comprises, by weight: 600 parts lead oxide powder, 80 parts tetrabasic lead sulfate, 100 parts lead sulfate, 200 parts deionized water, 4 parts thickener (sodium carboxymethyl cellulose: polytetrafluoroethylene emulsion = 3:1), 30 parts 30% alkaline nano silica aqueous solution (pH = 8, nano silica particle size 50nm), 5 parts lead dioxide, 0.5 parts short fiber (polyester short fiber, length 1mm), 0.2 parts magnesium sulfate, 0.5 parts stannous sulfate, 0.5 parts antimony trioxide, and 1 part mixed carbon material (graphene: acetylene black = 1:2).

[0048] A method for preparing a high-energy-density, long-life lead-acid battery includes the following steps:

[0049] S1. Dry mixing preparation of dry mixture: Add the above lead oxide powder, tetrabasic lead sulfate, lead sulfate, lead dioxide, short fiber, magnesium sulfate, stannous sulfate, antimony trioxide and mixed carbon materials into a mixer and dry mix at 200 rpm for 15 min to obtain a uniform dry mixture;

[0050] S2. Preparation of thickener aqueous solution: Take 200 parts of deionized water, heat to 40℃, slowly add 4 parts of thickener under constant temperature stirring, stir at 300 rpm for 25 minutes until the thickener is completely dissolved to obtain thickener aqueous solution;

[0051] S3. Paste preparation and discharge: Slowly add the thickener aqueous solution to the dry mixture at a speed of 20L / min, stir at 350rpm for 10min, then add 30 parts of 30% alkaline nano silica aqueous solution at a speed of 20L / min, and continue stirring for 20min to form a uniform and fine lead paste, and discharge the paste.

[0052] S4. Preparation of positive electrode plate: The above lead paste is coated on the surface of the positive electrode alloy grid with a coating thickness of 2.0 mm. It is cured at room temperature for 12 h at 25℃ and 60% humidity, and then dried at 55℃ and 5% humidity for 12 h to obtain the positive electrode plate.

[0053] S5. Battery assembly: The above-mentioned positive plates, AGM separators and conventional negative plates are stacked alternately, installed in an ABS shell, and injected with conventional sulfuric acid electrolyte. After formation, a lead-acid battery is obtained.

[0054] Example 3

[0055] A high-energy-density, long-life lead-acid battery positive plate paste comprises, by weight: 600 parts lead oxide powder, 120 parts tetrabasic lead sulfate, 140 parts lead sulfate, 300 parts deionized water, 6 parts thickener (sodium carboxymethyl cellulose: polytetrafluoroethylene emulsion = 4:1), 36 parts 30% alkaline nano silica aqueous solution (pH = 10, nano silica particle size 100nm), 10 parts lead dioxide, 1.5 parts short fiber (polyester short fiber, length 3mm), 0.4 parts magnesium sulfate, 2 parts stannous sulfate, 1 part antimony trioxide, and 3 parts mixed carbon material (graphene: acetylene black = 1:3).

[0056] A method for preparing a high-energy-density, long-life lead-acid battery includes the following steps:

[0057] S1. Dry mixing preparation of dry mixture: Add the above lead oxide powder, tetrabasic lead sulfate, lead sulfate, lead dioxide, short fiber, magnesium sulfate, stannous sulfate, antimony trioxide and mixed carbon materials into a mixer and dry mix at 300 rpm for 25 min to obtain a uniform dry mixture;

[0058] S2. Preparation of thickener aqueous solution: Take 300 parts of deionized water, heat to 60℃, slowly add 6 parts of thickener under constant temperature stirring, stir at 400 rpm for 30 min until the thickener is completely dissolved to obtain thickener aqueous solution;

[0059] S3. Paste preparation and discharge: Slowly add the thickener aqueous solution to the dry mixture at a speed of 30L / min, stir at 450rpm for 20min, then add 36 parts of 30% alkaline nano silica aqueous solution at a speed of 30L / min, and continue stirring for 30min to form a uniform and fine lead paste, and discharge the paste.

[0060] S4. Preparation of positive electrode plate: The above lead paste is coated on the surface of the positive electrode alloy grid with a coating thickness of 2.0 mm. It is cured at room temperature for 24 h at 35℃ and 70% humidity, and then dried at 75℃ and 25% humidity for 24 h to obtain the positive electrode plate.

[0061] S5. Battery assembly: The above-mentioned positive plates, AGM separators and conventional negative plates are stacked alternately, installed in an ABS shell, and injected with conventional sulfuric acid electrolyte. After formation, a lead-acid battery is obtained.

[0062] Comparative Example

[0063] The positive electrode lead paste includes 1000 parts lead oxide powder, 80 parts sulfuric acid, 120 parts deionized water, 1 part short fiber, 1.25 parts stannous sulfate, 0.75 parts antimony trioxide, and 2 parts graphite.

[0064] Preparation of positive electrode lead paste: Add 1 part of the above short fiber, 1.25 parts of stannous sulfate, 0.75 parts of antimony trioxide, and 2 parts of graphite to a paste mixing machine and dry mix with 1000 parts of lead powder for 7.5 min; in the paste mixing machine, mix with deionized water and sulfuric acid separately, with water addition time of 1 min and water mixing time of 5 min. The sulfuric acid density is 1.4 g / cm3, and the acid addition time is 16 min. When the lead paste temperature reaches 70℃ during the acid addition process, the exhaust fan needs to be turned on for cooling. The acid mixing time is 5 min, and stirring is continued for 3 min. If the temperature drops below 50℃, the paste is discharged.

[0065] Positive electrode plate preparation: The above lead paste is coated on the surface of the positive electrode alloy grid with a coating thickness of 2.3 mm. It is cured at 70°C and 95% humidity for 18 hours and dried at 65°C and 15% humidity for 18 hours to obtain the positive electrode plate.

[0066] Battery assembly: The positive plate, AGM separator, and conventional negative plate are stacked alternately, installed in an ABS casing, and injected with conventional sulfuric acid electrolyte. After formation, a lead-acid battery is obtained.

[0067] Performance testing

[0068] The following test methods were used to compare the above-mentioned positive electrode plate examples 1, 2, and 3:

[0069] like Figure 1-3 As shown, the 2-hour rate capacity test involves discharging a fully charged battery with a current of I2 (A) for 1 to 24 hours after charging, while maintaining the ambient temperature between 20 and 25°C. The change in current value during the discharge time should not exceed 1%. Discharge is stopped and the discharge time is recorded when the individual battery cell voltage reaches 1.75V. The discharge capacity is then calculated.

[0070] Cycle life test: The ambient temperature of the battery is maintained between 20 and 25°C. a) Discharge the battery at I2 (A) current until the voltage of a single cell reaches 1.75V; b) Limit the voltage to 2.5V / cell and charge at 0.4I2 (A) for 8 hours; c) Repeat steps a) and b). (The cycle life test is terminated when the discharge time in step a is less than 1.6 hours).

[0071]

[0072] As can be seen from the table above, the schemes of Examples 1-3, compared with the comparative examples, are significantly superior to existing products (comparative examples) in terms of energy density and cycle life. Furthermore, the preparation process requires no cooling equipment or high-temperature curing, making the process simple and controllable. Example 1, in particular, exhibits the best overall performance. This invention has simple components, low production costs, and wide applicability.

[0073] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A high-energy-density, long-life lead-acid battery positive plate paste, characterized in that, Components by weight include: 600 parts lead oxide powder, 80-120 parts tetrabasic lead sulfate, 100-140 parts lead sulfate, 200-300 parts deionized water, 4-6 parts thickener, 30-36 parts 30% alkaline nano silica aqueous solution, 5-10 parts lead dioxide, 0.5-1.5 parts short fiber, 0.2-0.4 parts magnesium sulfate, 0.5-2 parts stannous sulfate, 0.5-1 parts antimony trioxide, and 1-3 parts mixed carbon materials.

2. The high specific energy long life lead-acid battery positive plate lead paste according to claim 1, characterized in that, The lead oxide powder has a particle size ≤5μm, an oxidation degree of 72~76%, and an apparent specific gravity of 1.5~1.7g / cm³; the weight ratio of tetrabasic lead sulfate to lead sulfate is 0.6~1.2:

1.

3. The high specific energy long life lead-acid battery positive plate lead paste according to claim 1 or 2, characterized in that, The thickener is a compound of sodium carboxymethyl cellulose and polytetrafluoroethylene emulsion, with a weight ratio of 3:1 to 4:1; the 30% alkaline nano silica aqueous solution has a pH value of 8 to 10 and a particle size of 50 to 100 nm.

4. The high specific energy long life lead-acid battery positive plate lead paste according to claim 1 or 2, characterized in that, The mixed carbon material is prepared by mixing graphene and acetylene black in a mass ratio of 1:2~3, with the graphene particle size being 5~10nm and the acetylene black particle size being 35~45μm; the short fiber is polyester short fiber with a length of 1~3mm.

5. A method for preparing high-energy-density, long-life lead-acid battery positive plate lead paste as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Dry mixing preparation of dry mixture: Add lead oxide powder, tetrabasic lead sulfate, lead sulfate, lead dioxide, short fiber, magnesium sulfate, stannous sulfate, antimony trioxide and mixed carbon materials into a mixer and dry mix at 200~300 rpm for 15~25 min to obtain dry mixture; S2. Preparation of thickener aqueous solution: Take deionized water, heat it to 40~60℃, slowly add the thickener while stirring at a constant temperature, stir at a speed of 300~400rpm for 20~30min until the thickener is completely dissolved to obtain thickener aqueous solution; S3. Paste preparation and discharge: Slowly add the thickener aqueous solution prepared in step S2 to the dry mixture obtained in step S1, stir at 350~450 rpm for 10~20 min, then slowly add 30% alkaline nano silica aqueous solution, continue stirring for 20~30 min, and discharge the paste to obtain high specific energy long life lead-acid battery positive plate lead paste.

6. The method for preparing high-energy-density, long-life lead-acid battery positive plate lead paste according to claim 5, characterized in that, In step S3, the feeding rate of both the thickener aqueous solution and the 30% alkaline nano silica aqueous solution is 20~30L / min.

7. A high-energy-density, long-life lead-acid battery, characterized in that, It includes a positive electrode plate, a negative electrode plate, a separator, an electrolyte, and a housing. The positive electrode plate is made by curing and drying a positive electrode plate grid and a high-energy-density, long-life lead-acid battery positive electrode plate paste as described in any one of claims 1 to 4 coated on its surface.

8. A high-energy-density, long-life lead-acid battery according to claim 7, characterized in that, Lead paste is directly applied to the surface of the positive electrode grid, and the positive electrode plate is obtained by curing and drying at room temperature. The room temperature curing conditions are: curing at 25~35℃ and 60%~70% humidity for 12~24 hours; the drying conditions are: drying at 55~75℃ and 5%~25% humidity for 12~24 hours.

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