A positive lead paste, a negative lead paste, an electrolyte for a lead salt battery, a method for manufacturing the same, and a battery

Abstract

This invention discloses a lead-salt battery in the field of battery technology, comprising: a positive electrode plate, including the above-mentioned positive electrode lead paste and positive electrode grid, wherein the positive electrode lead paste comprises: 1000 parts of lead oxide powder, 0.6-1 parts of short fibers, 100-140 parts of deionized water, 100-140 parts of ammonium thiosulfate, and 3-6 parts of positive electrode lead paste mixture, wherein ammonium thiosulfate is used as a complexing agent, to inhibit electrode sulfation, to improve electrode interface reaction kinetics, and to stabilize the structure of active materials; and a negative electrode plate, including the above-mentioned negative electrode lead paste and negative electrode grid, and a positive electrode… The lead paste comprises: 1000 parts lead oxide powder, 0.6-1 parts short fiber, 100-140 parts deionized water, 100-140 parts ammonium thiosulfate, and 17-35 parts negative electrode lead paste mixture. Ammonium thiosulfate is used as a complexing agent to inhibit plate sulfation, improve electrode interface reaction kinetics, and stabilize the structure of active materials. The electrolyte adopts a sulfuric acid-free environmentally friendly system, resulting in excellent low-temperature performance, low charging temperature rise, low corrosiveness, long cycle life, and high safety, meeting the requirements of green environmental protection and high reliability.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a lead-salt battery. Background Technology

[0002] Traditional lead-acid batteries use dilute sulfuric acid as the electrolyte, which has drawbacks such as strong corrosiveness, easy generation of acid mist, poor low-temperature performance, severe heat generation during charging, easy sulfation of the plates, short cycle life, and high maintenance costs.

[0003] Existing technologies mostly involve localized improvements within the sulfuric acid system, failing to fundamentally address issues such as corrosion, sulfation, temperature variations, and low safety. A few patents without sulfuric acid systems have not achieved a synergistic system combining ammonium thiosulfate paste with ammonium sulfate / ammonium thiosulfate / sodium sulfate / nanocarbon composite electrolyte, resulting in limited improvements in sulfation resistance, low-temperature performance, cycle stability, and high-rate operation.

[0004] Therefore, it is necessary to develop a lead-salt battery that is completely sulfuric acid-free, has excellent low-temperature performance, is sulfation-resistant, has a long lifespan, and is safe and environmentally friendly to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a positive electrode paste, a negative electrode paste, an electrolyte, a method for manufacturing the same, and the battery itself. It employs a sulfuric acid-free environmentally friendly system, exhibiting excellent low-temperature performance, low charging temperature rise, low corrosiveness, long cycle life, and high safety, thus meeting the requirements for green environmental protection and high reliability.

[0006] The objective of this invention is achieved as follows:

[0007] A lead paste for the positive electrode of a lead-salt battery, characterized in that the components are as follows by weight:

[0008] 1000 parts lead oxide powder, 0.6-1 parts short fiber, 100-140 parts deionized water, 100-140 parts ammonium thiosulfate, and 3-6 parts positive electrode lead paste mixture. Ammonium thiosulfate is used as a complexing agent, to inhibit plate sulfidation, improve the reaction kinetics of the electrode interface, and stabilize the structure of the active material.

[0009] Furthermore, the positive electrode lead paste mixture comprises: 0.5-1.5 parts antimony trioxide, 0.5-1.5 parts stannous sulfate, and 2-3 parts carbon material.

[0010] A method for manufacturing a positive electrode plate for a lead-salt battery, using positive electrode lead paste, includes the following steps:

[0011] S1. Preparation of dry mixture: Add lead oxide powder, short fiber and mixture into the paste mixing machine, and dry mix at 200~300rpm for 4~6min to obtain dry mixture;

[0012] S2. Preparation of ammonium thiosulfate aqueous solution: Take deionized water and slowly add ammonium thiosulfate at room temperature. Stir at 3000~4000 rpm for 10~15 min until completely dissolved to obtain ammonium thiosulfate aqueous solution.

[0013] S3. Mixing and discharging the paste: Add the ammonium thiosulfate aqueous solution prepared in step S2 to the dry mixture obtained in step S1. The addition time is 8~12 min, and the mixture is stirred at 350~450 rpm for 15~20 min. Discharge the paste to obtain lead paste.

[0014] S4. After the lead paste is dispensed, it is directly applied to the surface of the electrode grid and cured for 24-36 hours at a temperature of 55-65℃ and a humidity of 75%-85%. Then, it is dried for 12-24 hours at a temperature of 55-75℃ and a humidity of 5%-25% to obtain the electrode.

[0015] A lead paste for the negative electrode of a lead-salt battery, the components of which are as follows by weight:

[0016] 1000 parts lead oxide powder, 0.6-1 parts short fiber, 100-140 parts deionized water, 100-140 parts ammonium thiosulfate, and 17-35 parts negative electrode lead paste mixture. Ammonium thiosulfate is used as a complexing agent, to inhibit plate sulfidation, improve the reaction kinetics of the electrode interface, and stabilize the structure of the active material.

[0017] Furthermore, the negative electrode lead paste mixture comprises 6-10 parts barium sulfate, 4-8 parts humic acid, 2-4 parts lignin, 2-4 parts acetylene, 1-3 parts graphite, and 2-6 parts colloid.

[0018] A method for manufacturing a negative electrode plate for a lead-salt battery, using negative electrode lead paste, includes the following steps:

[0019] S1. Preparation of dry mixture: Add lead oxide powder, short fiber and mixture into the paste mixing machine, and dry mix at 200~300rpm for 4~6min to obtain dry mixture;

[0020] S2. Preparation of ammonium thiosulfate aqueous solution: Take deionized water and slowly add ammonium thiosulfate at room temperature. Stir at 3000~4000 rpm for 10~15 min until completely dissolved to obtain ammonium thiosulfate aqueous solution.

[0021] S3. Mixing and discharging the paste: Add the ammonium thiosulfate aqueous solution prepared in step S2 to the dry mixture obtained in step S1. The addition time is 8~12 min, and the mixture is stirred at 350~450 rpm for 15~20 min. Discharge the paste to obtain lead paste.

[0022] S4. After the lead paste is dispensed, it is directly applied to the surface of the electrode grid and cured for 24-36 hours at a temperature of 55-65℃ and a humidity of 75%-85%. Then, it is dried for 12-24 hours at a temperature of 55-75℃ and a humidity of 5%-25% to obtain the electrode.

[0023] A lead-salt battery electrolyte, the components of which are as follows by weight:

[0024] Ammonium sulfate 80-120 parts, ammonium thiosulfate 20-40 parts, sodium sulfate 6-10 parts, nano-carbon solution 6-10 parts, deionized water 400-600 parts, sulfuric acid-free. Ammonium sulfate is used to adjust electrolyte density, inhibit sulfation, stabilize pH, and lower electrolyte freezing point. Ammonium thiosulfate is used as a complexing agent, to inhibit electrode sulfation, improve electrode interface reaction kinetics, and stabilize the structure of active materials.

[0025] Furthermore, the nano-carbon solution is a mixture of nano-carbon and deionized water, with a nano-carbon concentration of 5~8 g / L.

[0026] A method for preparing a lead-salt battery electrolyte includes the following steps:

[0027] S1. Heat deionized water to 30~40℃, add ammonium sulfate and stir to dissolve to obtain the base solution. Stir at 200~250 rpm for 10~15 min.

[0028] S2. Add ammonium thiosulfate and sodium sulfate sequentially and stir to dissolve to obtain a composite precursor solution. Stir at 200-250 rpm for 8-10 min after each addition.

[0029] S3. Add nano-carbon solution, stir at 300~350 rpm for 20~30 min, and let stand for 8~10 h to obtain electrolyte.

[0030] A lead-salt battery, comprising:

[0031] The positive electrode plate includes the above-mentioned positive electrode lead paste and positive electrode grid, and is manufactured using the above-mentioned manufacturing method;

[0032] The negative electrode plate includes the aforementioned negative electrode lead paste and negative electrode grid, and is manufactured using the aforementioned method.

[0033] The electrolyte is prepared using the method described above.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] This invention adopts a sulfuric acid-free environmentally friendly system (no strong corrosion, no acid mist, making production / use / recycling safer), and the battery has excellent low-temperature performance (capacity retention rate improved by more than 20% at -25℃), low charging temperature rise (no difference from ambient temperature), and long cycle life (cycle life improved by more than 30%), meeting the requirements of green environmental protection and high reliability.

[0036] The charging, discharging, and conductivity principles of traditional lead-acid batteries are based on reversible electrochemical reactions. Through the chemical conversion between the active materials at the positive and negative electrodes and the dilute sulfuric acid electrolyte, electrical energy is converted into chemical energy. The internal ionic conductivity of the battery mainly depends on the H+ in the electrolyte. + and SO4² - Under the influence of an electric field, PbO2 at the positive electrode and Pb at the negative electrode continuously react with sulfate ions during charging and discharging to form lead sulfate (discharging), or are reduced back to PbO2 and Pb during charging (charging). Therefore, for lead-acid batteries to achieve efficient and reversible conversion, in addition to relying on the active materials PbO2 and Pb at the positive and negative electrodes, a stable supply of SO4²⁻ in the electrolyte is essential. - With migratable conductive ions.

[0037] The lead-salt battery of this invention abandons the traditional highly corrosive dilute sulfuric acid system and adopts an ammonium salt composite electrolyte. Through ion conduction and electrochemical reaction mechanisms, it achieves the complete charging and discharging process without the use of sulfuric acid.

[0038] 1. Ammonium sulfate provides stable and controllable H+. + and SO4² - Source: Ammonium sulfate dissociates in the electrolyte to provide SO4²⁻. - NH4 + A reversible reaction can occur in water to produce H₂. + (NH4) + +H2O NH3·H2O+H + It replaces traditional dilute sulfuric acid, providing the necessary H₂ for the conversion of active substances. + and SO4² - To ensure PbO2 PbSO4 The reversible reaction of Pb proceeds smoothly. Adjustment of electrolyte density releases SO4²⁻. - Optimizes ion conduction, reduces internal resistance at low temperatures, and enhances discharge capability; suppresses sulfation: NH4 + It forms a soluble complex with PbSO4, slowing down crystal growth and inhibiting capacity decay; it stabilizes pH value, buffering electrolyte pH fluctuations with weak acidity, reducing plate corrosion, and adapting to high-rate charge and discharge; it lowers electrolyte freezing point, which can be reduced to below -30℃, significantly improving low-temperature adaptability.

[0039] 2. Ammonium thiosulfate complexes lead ions during the paste preparation process, improving the dispersibility and adhesion of active materials, enhancing electrode mechanical stability, reducing active material shedding, and extending cycle life. In addition, ammonium thiosulfate dissociates into S₂O₃²⁻. - It participates in ion conduction, improves the double-layer structure of the electrode interface, and enhances reaction kinetics. On the other hand, it can interfere with the formation of coarse PbSO4 crystals, inhibit irreversible sulfation of the electrode plate, make the charge and discharge reaction more stable and reversible, regulate the ionic environment at the electrode / electrolyte interface, promote the reversible transformation of Pb / PbO2 and PbSO4, and improve charge and discharge efficiency.

[0040] 3. Sodium sulfate helps to improve the ionic strength and low-temperature fluidity of the electrolyte; nano-carbon constructs a continuous conductive network, reduces the internal resistance of the electrode, and further improves the rate performance and charge acceptance.

[0041] This invention is a completely sulfuric acid-free system, which solves the problems of corrosion, acid mist, and safety risks at the source. Under conditions of weak corrosion, environmental protection, and safety, it fully realizes the reversible conversion of electrical energy and chemical energy in lead-based batteries. At the same time, it fundamentally solves the problems of traditional lead-acid batteries, such as high corrosion, low temperature difference, easy sulfation, and charging heat generation. Attached Figure Description

[0042] 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.

[0043] Figure 1 This is a process flow diagram for the preparation of the lead-salt battery of the present invention. Detailed Implementation

[0044] 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.

[0045] Example 1

[0046] like Figure 1 As shown, a lead-salt battery includes:

[0047] Positive electrode lead paste: 1000 parts lead oxide powder, 0.8 parts short fiber, 120 parts deionized water, 120 parts ammonium thiosulfate, and 4.5 parts mixed material (1 part antimony trioxide, 1 part stannous sulfate, and 2.5 parts carbon material).

[0048] Negative electrode lead paste: 1000 parts lead oxide powder, 0.8 parts short fiber, 120 parts deionized water, 120 parts ammonium thiosulfate, and 26 parts of mixed material (8 parts barium sulfate, 6 parts humic acid, 3 parts lignin, 3 parts acetylene black, 2 parts graphite, and 4 parts colloid).

[0049] Electrolyte: 100 parts ammonium sulfate, 30 parts ammonium thiosulfate, 8 parts sodium sulfate, 8 parts nano-carbon solution (nano-carbon concentration 6.5 g / L), and 500 parts deionized water.

[0050] Its preparation method is as follows:

[0051] 1. Preparation of positive electrode plate

[0052] S101. Preparation of dry mixture: Add 1000 parts of lead oxide powder, 0.8 parts of short fiber, and 4 parts of mixture to a paste mixer and dry mix at 250 rpm for 5 minutes to obtain dry mixture;

[0053] S102, Preparation of ammonium thiosulfate aqueous solution: Take 120 parts of deionized water, slowly add 120 parts of ammonium thiosulfate at room temperature, stir at 3500 rpm for 12 min, and obtain ammonium thiosulfate aqueous solution after complete dissolution.

[0054] S103. Grinding and discharging: Add ammonium thiosulfate aqueous solution to the dry mixture at a uniform rate for 10 minutes, stir at 400 rpm for 18 minutes, and then discharge the positive electrode lead paste.

[0055] S104. Applying paste, curing and drying: Apply positive electrode lead paste to the positive electrode grid, cure at 60℃ and 80% humidity for 30 hours, and dry at 65℃ and 15% humidity for 18 hours to obtain the positive electrode plate.

[0056] 2. Preparation of negative electrode plate

[0057] The preparation steps are the same as for the positive electrode plate, except that the components of the negative electrode lead paste are replaced.

[0058] 3. Electrolyte preparation

[0059] S201. Add 500 parts of deionized water to the reactor, heat to 35°C, add 100 parts of ammonium sulfate while stirring at 220 rpm, stir for 12 min to obtain the base solution;

[0060] S202, add 30 parts of ammonium thiosulfate and 8 parts of sodium sulfate in sequence. Stir at 220 r / min for 9 min after each addition of a component to obtain a composite precursor solution;

[0061] Add 8 parts of nano-carbon solution to S203, stir at 320 rpm for 25 min, let stand for 9 h to obtain electrolyte.

[0062] 4. Battery manufacturing

[0063] S301. Assemble and weld the above-mentioned positive plate, negative plate and AGM separator, put them into ABS shell, inject the above-mentioned electrolyte, and after formation, obtain a lead-salt battery.

[0064] Example 2

[0065] A lead-salt battery, comprising:

[0066] Positive electrode lead paste: 1000 parts lead oxide powder, 0.6 parts short fiber, 100 parts deionized water, 100 parts ammonium thiosulfate, 3 parts mixed material (0.5 parts antimony trioxide, 0.5 parts stannous sulfate, 2.5 parts carbon material).

[0067] Negative electrode lead paste: 1000 parts lead oxide powder, 0.6 parts short fiber, 100 parts deionized water, 100 parts ammonium thiosulfate, and 17 parts of mixed materials (6 parts barium sulfate, 4 parts humic acid, 2 parts lignin, 2 parts acetylene black, 1 part graphite, and 2 parts colloid).

[0068] Electrolyte: 80 parts ammonium sulfate, 20 parts ammonium thiosulfate, 6 parts sodium sulfate, 6 parts nano-carbon solution (nano-carbon concentration 5g / L), and 400 parts deionized water.

[0069] The preparation method is basically the same as in Example 1, with only the following parameters adjusted:

[0070] 1. Dry mixing: 200 rpm for 4 min; Ammonium thiosulfate aqueous solution: 3000 rpm for 10 min; Add paste: 8 min, 350 rpm, 15 min mixing.

[0071] 2. Curing conditions: 55℃, 75% humidity, 24h; Drying conditions: 55℃, 5% humidity, 12h.

[0072] 3. Electrolyte preparation: Base solution temperature 30℃, stirring speed 200rpm, time 10min; composite solution stirring time 8min; nano-carbon solution stirring 20min, stand for 8h.

[0073] Example 3

[0074] A lead-salt battery, comprising:

[0075] Positive electrode lead paste: 1000 parts lead oxide powder, 1 part short fiber, 140 parts deionized water, 140 parts ammonium thiosulfate, 6 parts mixed material (1.5 parts antimony trioxide, 1.5 parts stannous sulfate, 3 parts carbon material).

[0076] Negative electrode lead paste: 1000 parts lead oxide powder, 1 part short fiber, 140 parts deionized water, 140 parts ammonium thiosulfate, and 35 parts of mixed materials (10 parts barium sulfate, 8 parts humic acid, 4 parts lignin, 4 parts acetylene black, 3 parts graphite, and 6 parts colloid).

[0077] Electrolyte: 120 parts ammonium sulfate, 40 parts ammonium thiosulfate, 10 parts sodium sulfate, 10 parts nano-carbon solution (nano-carbon concentration 8 g / L), and 600 parts deionized water.

[0078] The preparation method is basically the same as in Example 1, with only the following parameters adjusted:

[0079] 1. Dry mixing: 300 rpm for 6 min; Ammonium thiosulfate aqueous solution: 4000 rpm for 15 min; Add paste: 12 min, 450 rpm, 20 min mixing.

[0080] 2. Curing conditions: 65℃, 85% humidity, 36h; Drying conditions: 75℃, 25% humidity, 24h.

[0081] 3. Electrolyte preparation: Base solution temperature 40℃, stirring speed 250rpm, time 15min; composite solution stirring time 10min; nano-carbon solution stirring 30min, stand for 10h.

[0082] Comparative Example

[0083] A lead-salt battery, comprising:

[0084] Positive electrode plate preparation: 0.8 parts short fiber, 1 part stannous sulfate, 1 part antimony trioxide, and 2 parts carbon material were added to a paste mixing machine and dry-mixed with 1000 parts lead powder for 7.5 min. In the paste mixing machine, deionized water and sulfuric acid were added separately for water mixing and acid mixing. The water addition time was 1 min, and the water mixing time was 5 min. The sulfuric acid density was 1.4 g / cm³, and the acid addition time was 16 min. During the acid addition process, when the lead paste temperature reached 70℃, the exhaust fan was turned on for cooling. The acid mixing time was 5 min, followed by stirring for 3 min. If the temperature dropped below 50℃, the paste was discharged. The lead paste was coated onto the surface of the positive electrode alloy grid and cured for 18 h at 70℃ and 95% humidity, then dried for 18 h at 65℃ and 15% humidity to obtain the positive electrode plate.

[0085] Negative electrode plate preparation: 0.8 parts short fiber, 8 parts barium sulfate, 6 parts humic acid, 3 parts lignin, 3 parts acetylene black, 2 parts graphite, and 3 parts mortar are added to a paste mixing machine and mixed with 1000 parts lead powder for 7.5 min. In the paste mixing machine, deionized water and sulfuric acid are added separately for 1 min of water mixing and 5 min of acid mixing. The sulfuric acid density is 1.4 g / cm³, and the acid mixing time is 18 min. When the lead paste temperature reaches 70℃ during acid mixing, the exhaust fan needs to be turned on for cooling. The acid mixing time is 5 min, followed by stirring for 3 min. If the temperature drops below 50℃, the paste is discharged. The lead paste is coated onto the surface of the positive electrode alloy grid and cured for 18 h at 65℃ and 95% humidity, then dried for 18 h at 65℃ and 15% humidity to obtain the negative electrode plate.

[0086] Electrolyte preparation: Add 80 parts of deionized water to the acid preparation container, and slowly add 40 parts of 98% concentrated sulfuric acid and 1 part of sodium sulfate while stirring continuously. After the addition is complete, wait for the solution temperature to drop to room temperature to obtain the electrolyte.

[0087] The positive and negative plates are assembled and welded with the AGM separator, then inserted into an ABS shell, and the electrolyte is injected to form a lead-acid battery.

[0088] The above-described Examples 1, 2, 3, and Comparative Examples were tested:

[0089]

[0090] As shown in the table above, compared with Comparative Example 1, the lead-salt battery of the present invention, using the schemes of Examples 1-3, exhibits a more than 20% increase in capacity retention at -25℃ and a more than 30% increase in 80% DOD cycle life compared to the lead-acid battery, with almost no temperature rise during charging. The present invention demonstrates outstanding inventiveness, employing a sulfuric acid-free environmentally friendly system. The positive and negative electrodes utilize a unified preparation process adapted to differentiated formulations, resulting in a simple and controllable process. The battery exhibits excellent low-temperature performance, low charging temperature rise, low corrosiveness, long cycle life, and high safety, meeting the requirements for green environmental protection and high reliability, and possessing significant promotional value.

[0091] 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 positive electrode paste for lead-salt batteries, characterized in that, The components are as follows by weight: 1000 parts lead oxide powder, 0.6-1 parts short fiber, 100-140 parts deionized water, 100-140 parts ammonium thiosulfate, and 3-6 parts positive electrode lead paste mixture. Ammonium thiosulfate is used as a complexing agent, to inhibit plate sulfidation, improve the reaction kinetics of the electrode interface, and stabilize the structure of the active material.

2. The positive electrode lead paste for a lead-salt battery according to claim 1, characterized in that, The positive electrode lead paste mixture consists of: 0.5-1.5 parts antimony trioxide, 0.5-1.5 parts stannous sulfate, and 2-3 parts carbon material.

3. A method for manufacturing a positive electrode plate of a lead-salt battery, using the positive electrode lead paste as described in claim 1 or 2, characterized in that, Includes the following steps: S1. Preparation of dry mixture: Add lead oxide powder, short fiber and mixture into the paste mixing machine, and dry mix at 200~300rpm for 4~6min to obtain dry mixture; S2. Preparation of ammonium thiosulfate aqueous solution: Take deionized water and slowly add ammonium thiosulfate at room temperature. Stir at 3000~4000 rpm for 10~15 min until completely dissolved to obtain ammonium thiosulfate aqueous solution. S3. Mixing and discharging the paste: Add the ammonium thiosulfate aqueous solution prepared in step S2 to the dry mixture obtained in step S1. The addition time is 8~12 min, and the mixture is stirred at 350~450 rpm for 15~20 min. Discharge the paste to obtain lead paste. S4. After the lead paste is dispensed, it is directly applied to the surface of the electrode grid and cured for 24-36 hours at a temperature of 55-65℃ and a humidity of 75%-85%. Then, it is dried for 12-24 hours at a temperature of 55-75℃ and a humidity of 5%-25% to obtain the electrode.

4. A lead paste for the negative electrode of a lead-salt battery, characterized in that, The components are as follows by weight: 1000 parts lead oxide powder, 0.6-1 parts short fiber, 100-140 parts deionized water, 100-140 parts ammonium thiosulfate, and 17-35 parts negative electrode lead paste mixture. Ammonium thiosulfate is used as a complexing agent, to inhibit plate sulfidation, improve the reaction kinetics of the electrode interface, and stabilize the structure of the active material.

5. The lead paste for the negative electrode of a lead-salt battery according to claim 4, characterized in that, The negative electrode lead paste mixture consists of 6-10 parts barium sulfate, 4-8 parts humic acid, 2-4 parts lignin, 2-4 parts acetylene, 1-3 parts graphite, and 2-6 parts colloid.

6. A method for manufacturing a negative electrode plate of a lead-salt battery, using the negative electrode lead paste as described in claim 1 or 2, characterized in that, Includes the following steps: S1. Preparation of dry mixture: Add lead oxide powder, short fiber and mixture into the paste mixing machine, and dry mix at 200~300rpm for 4~6min to obtain dry mixture; S2. Preparation of ammonium thiosulfate aqueous solution: Take deionized water and slowly add ammonium thiosulfate at room temperature. Stir at 3000~4000 rpm for 10~15 min until completely dissolved to obtain ammonium thiosulfate aqueous solution. S3. Mixing and discharging the paste: Add the ammonium thiosulfate aqueous solution prepared in step S2 to the dry mixture obtained in step S1. The addition time is 8~12 min, and the mixture is stirred at 350~450 rpm for 15~20 min. Discharge the paste to obtain lead paste. S4. After the lead paste is dispensed, it is directly applied to the surface of the electrode grid and cured for 24-36 hours at a temperature of 55-65℃ and a humidity of 75%-85%. Then, it is dried for 12-24 hours at a temperature of 55-75℃ and a humidity of 5%-25% to obtain the electrode.

7. A lead-salt battery electrolyte, characterized in that, The components are as follows by weight: Ammonium sulfate 80-120 parts, ammonium thiosulfate 20-40 parts, sodium sulfate 6-10 parts, nano-carbon solution 6-10 parts, deionized water 400-600 parts, sulfuric acid-free. Ammonium sulfate is used to adjust electrolyte density, inhibit sulfation, stabilize pH, and lower electrolyte freezing point. Ammonium thiosulfate is used as a complexing agent, to inhibit electrode sulfation, improve electrode interface reaction kinetics, and stabilize the structure of active materials.

8. The lead-salt battery electrolyte according to claim 7, characterized in that, The nano-carbon solution is a mixture of nano-carbon and deionized water, with a nano-carbon concentration of 5~8 g / L.

9. A method for preparing the lead-salt battery electrolyte as described in claim 7, characterized in that, Includes the following steps: S1. Heat deionized water to 30~40℃, add ammonium sulfate and stir to dissolve to obtain the base solution. Stir at 200~250 rpm for 10~15 min. S2. Add ammonium thiosulfate and sodium sulfate sequentially and stir to dissolve to obtain a composite precursor solution. Stir at 200-250 rpm for 8-10 min after each addition. S3. Add nano-carbon solution, stir at 300~350 rpm for 20~30 min, and let stand for 8~10 h to obtain electrolyte.

10. A lead-salt battery, characterized in that, include: A positive electrode plate, comprising the positive electrode lead paste and positive electrode grid as described in claim 1 or 2, and manufactured using the manufacturing method described in claim 3; The negative electrode plate includes the negative electrode lead paste and negative electrode grid as described in claim 4 or 5, and is manufactured using the manufacturing method described in claim 6; The electrolyte is the electrolyte described in claim 7 or 8 and is prepared by the preparation method described in claim 9.

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