Lead paste of lead-acid storage battery, and preparation method therefor and use thereof

Abstract

The present application relates to the technical field of lead-acid storage batteries. Disclosed is a lead paste of a lead-acid storage battery. The lead paste comprises the following components in parts by weight: 100 parts of a lead powder, 10-12 parts of water, and 9.5-11 parts of sulfuric acid. When the lead paste is used as positive electrode lead paste, the lead paste further comprises 9-11 parts of a positive electrode auxiliary material; and when the lead paste is used as a negative electrode lead paste, the lead paste further comprises 25-35 parts of a negative electrode auxiliary material. The lead paste prepared in the present application can increase the utilization rate of a positive electrode active material, and prolong the service life of a battery while ensuring the capacity of the battery. Zinc-dioxide-coated glass fibers are added to the positive electrode auxiliary material, and the oxide has stable properties in a PbO2 / PbSO4 electrode reaction zone; during the long-term operation process of a battery at a high temperature, a trace amount of zinc dioxide covering the glass fibers permeates into an electrolyte solution; therefore, the formation efficiency of the battery is improved, and the utilization rate of the positive electrode active material is improved.

Description

Lead paste for lead-acid batteries, preparation method and application thereof Technical Field

[0001] The present application relates to the technical field of lead-acid batteries, and in particular to a lead paste for lead-acid batteries, a preparation method thereof, and applications thereof. Background Art

[0002] Lead-acid batteries for warehouse and handling vehicles have increasingly higher requirements for endurance performance and cycle life. Traditional lead-acid batteries for warehouse and handling vehicles in China are mainly flooded batteries and tubular batteries. The utilization rate of active materials is not high and the battery life is not long, which affects customer use.

[0003] Summary of the Invention

[0004] In order to solve at least one of the above technical problems and develop a lead-acid battery with high active material utilization and long service life, the present application provides a lead paste for a lead-acid battery, a preparation method and an application.

[0005] In one aspect, the present application provides a lead paste for a lead-acid battery, comprising the following components in parts by weight:

[0006] 100 parts of lead powder;

[0007] 10-12 parts water;

[0008] 9.5-11 parts of sulfuric acid;

[0009] When the lead paste is used as positive electrode lead paste, it also includes 9 to 11 parts of positive electrode auxiliary materials;

[0010] When the lead paste is used as negative electrode lead paste, it also includes 25 to 35 parts of negative electrode auxiliary materials.

[0011] Optionally, the positive electrode auxiliary material includes the following components in parts by weight: 3 to 5 parts of green plate powder; 2 to 3 parts of carbon; 1 to 1.5 parts of stannous sulfate; 1.5 to 2.5 parts of antimony trioxide; 0.8 to 1.5 parts of short fibers; 0.15 to 0.25 parts of phosphoric acid; 1.5 to 2 parts of silica gel and 1 to 1.5 parts of sodium bicarbonate.

[0012] Optionally, the short fibers are polypropylene fibers.

[0013] Optionally, the positive electrode auxiliary material further includes 1 to 1.5 parts of glass fiber; the surface of the glass fiber is coated with a zinc dioxide coating.

[0014] Optionally, the thickness of the zinc dioxide coating is 0.3 μm.

[0015] Optionally, the negative electrode auxiliary material includes the following components in parts by weight: 2.5-4 parts of lignin; 12-15 parts of barium sulfate; 4-8 parts of carbon black; 0.8-1.5 parts of short fibers; 1.5-2 parts of silica gel and 1-1.5 parts of sodium bicarbonate.

[0016] Optionally, the short fibers are chopped carbon fibers.

[0017] In a second aspect, the present application provides a method for preparing the above-mentioned lead paste for lead-acid batteries, comprising first adding lead powder, then adding positive electrode auxiliary materials, and dry mixing and stirring for 5 minutes; adding the formulated amount of water within 2 minutes, wet mixing and stirring, adding sulfuric acid solution within 13 minutes and stirring, raising the temperature to 72°C and cooling, and stirring for 10 to 15 minutes to obtain the positive electrode lead paste.

[0018] In a third aspect, the present application provides a method for preparing the above-mentioned lead paste for lead-acid batteries, comprising first adding lead powder, then adding negative electrode auxiliary materials, and dry mixing and stirring for 5 minutes; adding the formulated amount of water within 2 minutes, wet mixing and stirring, adding sulfuric acid solution within 13 minutes and stirring, raising the temperature to 65°C and cooling, and stirring for 10 to 15 minutes to obtain the negative electrode lead paste.

[0019] In a fourth aspect, the present application provides an application of the above-mentioned lead paste for lead-acid batteries in the field of flooded batteries or tubular batteries.

[0020] In summary, the present invention includes at least one of the following beneficial technical effects:

[0021] 1. Increase the utilization rate of positive electrode active materials, ensure battery capacity while extending battery life.

[0022] 2. Adding zinc dioxide-coated glass fiber to the positive electrode auxiliary material, the oxide has stable properties in the PbO2 / PbSO4 electrode reaction zone. During the long-term operation of the battery at high temperature, the trace amount of zinc dioxide coated on the glass fiber penetrates into the electrolyte, increasing the battery formation efficiency and improving the utilization rate of the positive electrode active material;

[0023] 3. During the battery formation stage, a multi-frequency charge and discharge formation process is used to achieve the effect of battery depolarization. The water loss of the battery during the formation process is reduced by 65%, which greatly retains the initial state of the battery plate, resulting in a long-life battery with good formation effect and low acid density. DETAILED DESCRIPTION

[0024] The present application is further described in detail below with reference to the embodiments.

[0025] Unless otherwise specified, the raw materials involved in this application were purchased from commercially available products.

[0026] The glass fiber coated with zinc dioxide was purchased from Jiangyin Wanqian Chemicals Co., Ltd.

[0027] Polypropylene fiber was purchased from Shandong Xinxing Building Materials Engineering Co., Ltd.;

[0028] Lignin was purchased from Shanghai Yunzhe New Materials, model MN-1;

[0029] The chopped carbon fiber is purchased from Taili Carbon Fiber.

[0030] Preparation Example 1

[0031] The positive electrode auxiliary materials in this preparation example include, by weight: 3 parts of green plate powder, 2.5 parts of carbon, 1.2 parts of stannous sulfate, 2 parts of antimony trioxide, 1 part of polypropylene fiber, 0.2 parts of phosphoric acid, 1.8 parts of silica gel, 1.2 parts of sodium bicarbonate and 1 part of glass fiber coated with zinc dioxide.

[0032] Preparation Example 2

[0033] The positive electrode auxiliary materials in this preparation example include, by weight: 3.5 parts of green plate powder, 2 parts of carbon, 1.5 parts of stannous sulfate, 1.5 parts of antimony trioxide, 1.2 parts of polypropylene fiber, 0.15 parts of phosphoric acid, 1.5 parts of silica gel, 1.5 parts of sodium bicarbonate and 1.2 parts of glass fiber coated with zinc dioxide.

[0034] Preparation Example 3

[0035] The positive electrode auxiliary materials in this preparation example include, by weight, 4 parts of green plate powder, 3 parts of carbon, 1 part of stannous sulfate, 2.5 parts of antimony trioxide, 0.8 parts of polypropylene fiber, 0.25 parts of phosphoric acid, 2 parts of silica gel, 1 part of sodium bicarbonate, and 1.5 parts of glass fiber coated with zinc dioxide.

[0036] Preparation Example 4

[0037] The positive electrode auxiliary materials in this preparation example include, by weight, 4.5 parts of green plate powder, 2.5 parts of carbon, 1.2 parts of stannous sulfate, 2 parts of antimony trioxide, 1.5 parts of polypropylene fiber, 0.2 parts of phosphoric acid, 1.5 parts of silica gel, 1.2 parts of sodium bicarbonate and 1.2 parts of glass fiber coated with zinc dioxide.

[0038] Preparation Example 5

[0039] The positive electrode auxiliary materials in this preparation example include, by weight: 5 parts of green plate powder, 2.5 parts of carbon, 1 part of stannous sulfate, 2 parts of antimony trioxide, 1 part of polypropylene fiber, 0.2 parts of phosphoric acid, 1.5 parts of silica gel, 1.2 parts of sodium bicarbonate and 1.2 parts of glass fiber coated with zinc dioxide.

[0040] Preparation Example 6

[0041] The negative electrode auxiliary materials in this preparation example include, by weight, 2.5 parts of lignin, 13 parts of barium sulfate, 6 parts of carbon black, 1 part of chopped carbon fiber, 1.8 parts of silica gel, and 1.2 parts of sodium bicarbonate.

[0042] Preparation Example 7

[0043] The negative electrode auxiliary materials in this preparation example include, by weight, 3 parts of lignin, 15 parts of barium sulfate, 8 parts of carbon black, 1.2 parts of chopped carbon fibers, 1.5 parts of silica gel, and 1.5 parts of sodium bicarbonate.

[0044] Preparation Example 8

[0045] The negative electrode auxiliary materials in this preparation example include, by weight, 3.5 parts of lignin, 12 parts of barium sulfate, 4 parts of carbon black, 0.8 parts of chopped carbon fibers, 2 parts of silica gel, and 1 part of sodium bicarbonate.

[0046] Preparation Example 9

[0047] The negative electrode auxiliary materials in this preparation example include, by weight, 4 parts of lignin, 15 parts of barium sulfate, 6 parts of carbon black, 1.5 parts of chopped carbon fibers, 1.5 parts of silica gel, and 1.2 parts of sodium bicarbonate.

[0048] Preparation Example 10

[0049] The negative electrode auxiliary materials in this preparation example include, by weight, 3 parts of lignin, 12 parts of barium sulfate, 6 parts of carbon black, 1 part of chopped carbon fiber, 1.5 parts of silica gel, and 1.2 parts of sodium bicarbonate.

[0050] Preparation Example 11

[0051] The positive electrode auxiliary materials in this preparation example include, by weight, 3 parts of green plate powder, 2.5 parts of carbon, 1.2 parts of stannous sulfate, 2 parts of antimony trioxide, 1 part of polypropylene fiber, 0.2 parts of phosphoric acid, 1.8 parts of silica gel and 1.2 parts of sodium bicarbonate.

[0052] Preparation Example 12

[0053] The positive electrode auxiliary materials in this preparation example include, by weight, 3.5 parts of green plate powder, 2 parts of carbon, 1.5 parts of stannous sulfate, 1.5 parts of antimony trioxide, 1.2 parts of polypropylene fiber, 0.15 parts of phosphoric acid, 1.5 parts of silica gel and 1.5 parts of sodium bicarbonate.

[0054] Preparation Example 13

[0055] The positive electrode auxiliary materials in this preparation example include, by weight, 4 parts of green plate powder, 3 parts of carbon, 1 part of stannous sulfate, 2.5 parts of antimony trioxide, 0.8 parts of polypropylene fiber, 0.25 parts of phosphoric acid, 2 parts of silica gel and 1.5 parts of sodium bicarbonate.

[0056] Preparation Example 14

[0057] The positive electrode auxiliary materials in this preparation example include, by weight, 4.5 parts of green plate powder, 2.5 parts of carbon, 1.2 parts of stannous sulfate, 2 parts of antimony trioxide, 1.5 parts of polypropylene fiber, 0.2 parts of phosphoric acid, 1.5 parts of silica gel and 1.2 parts of sodium bicarbonate.

[0058] Preparation Example 15

[0059] The positive electrode auxiliary materials in this preparation example include, by weight, 5 parts of green plate powder, 2.5 parts of carbon, 1 part of stannous sulfate, 2 parts of antimony trioxide, 1 part of polypropylene fiber, 0.2 parts of phosphoric acid, 1.5 parts of silica gel, and 1.2 parts of sodium bicarbonate.

[0060] Examples 1 to 5 are used to prepare positive electrode lead paste

[0061] Example 1

[0062] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 10 parts of water, 10 parts of sulfuric acid, and 10 parts of the positive electrode auxiliary material prepared in Preparation Example 1;

[0063] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 12 minutes to obtain positive electrode lead paste.

[0064] Example 2

[0065] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 11 parts of water, 10.5 parts of sulfuric acid, and 9.5 parts of the positive electrode auxiliary material prepared in Preparation Example 2;

[0066] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 15 minutes to obtain positive electrode lead paste.

[0067] Example 3

[0068] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 12 parts of water, 9.5 parts of sulfuric acid, and 11 parts of the positive electrode auxiliary material prepared in Preparation Example 3;

[0069] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 10 minutes to obtain positive electrode lead paste.

[0070] Example 4

[0071] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 12 parts of water, 11 parts of sulfuric acid, and 10.5 parts of the positive electrode auxiliary material prepared in Preparation Example 4;

[0072] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 12 minutes to obtain positive electrode lead paste.

[0073] Example 5

[0074] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 10 parts of water, 10 parts of sulfuric acid, and 9 parts of the positive electrode auxiliary material prepared in Preparation Example 5;

[0075] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 12 minutes to obtain positive electrode lead paste.

[0076] Examples 6 to 10 are used to prepare negative electrode lead paste

[0077] Example 6

[0078] The negative electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 10 parts of water, 10 parts of sulfuric acid, and 30 parts of the negative electrode auxiliary material prepared in Preparation Example 6;

[0079] First add lead powder, then add negative electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 65°C, cool it down, and stir for 12 minutes to obtain negative electrode lead paste.

[0080] Example 7

[0081] The negative electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 11 parts of water, 10.5 parts of sulfuric acid, and 28 parts of the negative electrode auxiliary material prepared in Preparation Example 7;

[0082] First add lead powder, then add negative electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 65°C, cool it down, and stir for 15 minutes to obtain negative electrode lead paste.

[0083] Example 8

[0084] The negative electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 12 parts of water, 9.5 parts of sulfuric acid, and 32 parts of the negative electrode auxiliary material prepared in Preparation Example 8;

[0085] First add lead powder, then add negative electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 65°C, cool it down, and stir for 10 minutes to obtain negative electrode lead paste.

[0086] Example 9

[0087] The negative electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 12 parts of water, 11 parts of sulfuric acid, and 35 parts of the negative electrode auxiliary material prepared in Preparation Example 9;

[0088] First add lead powder, then add negative electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 65°C, cool it down, and stir for 12 minutes to obtain negative electrode lead paste.

[0089] Example 10

[0090] The negative electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 10 parts of water, 10 parts of sulfuric acid, and 25 parts of the negative electrode auxiliary material prepared in Preparation Example 10;

[0091] First add lead powder, then add negative electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 65°C, cool it down, and stir for 12 minutes to obtain negative electrode lead paste.

[0092] Examples 11 to 15 are used to prepare positive electrode lead paste

[0093] The difference from Examples 1 to 5 is that Examples 11 to 15 are prepared using the positive electrode auxiliary materials in Preparation Examples 11 to 15, respectively, as follows.

[0094] Example 11

[0095] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 10 parts of water, 10 parts of sulfuric acid, and 10 parts of the positive electrode auxiliary material prepared in Preparation Example 11;

[0096] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 12 minutes to obtain positive electrode lead paste.

[0097] Example 12

[0098] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 11 parts of water, 10.5 parts of sulfuric acid, and 9.5 parts of the positive electrode auxiliary material prepared in Preparation Example 12;

[0099] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 15 minutes to obtain positive electrode lead paste.

[0100] Example 13

[0101] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 12 parts of water, 9.5 parts of sulfuric acid, and 11 parts of the positive electrode auxiliary material prepared in Preparation Example 13;

[0102] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 10 minutes to obtain positive electrode lead paste.

[0103] Example 14

[0104] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 12 parts of water, 11 parts of sulfuric acid, and 10.5 parts of the positive electrode auxiliary material prepared in Preparation Example 14;

[0105] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 12 minutes to obtain positive electrode lead paste.

[0106] Example 15

[0107] The positive electrode lead paste of this embodiment includes the following components in parts by weight: 100 parts of lead powder, 10 parts of water, 10 parts of sulfuric acid, and 9 parts of the positive electrode auxiliary material prepared in Preparation Example 15;

[0108] First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 12 minutes to obtain positive electrode lead paste.

[0109] Lead-acid batteries 1 to 5 were prepared by combining the positive electrode pastes of Examples 1 to 5 with the negative electrode pastes of Examples 6 to 10. Lead-acid batteries 6 to 10 were prepared by combining the positive electrode pastes of Examples 11 to 15 with the negative electrode pastes of Examples 6 to 10. The combinations are shown in Table 1. The depolarization charging process shown in Table 2 was used for the preparation.

[0110] Table 1 Selection of positive and negative lead paste for lead-acid batteries 1 to 5

[0111] Table 2 Depolarization charging process

[0112] According to the process shown in Table 2, four 6-EVF-65D batteries are made from each of lead-acid batteries 1 to 10;

[0113] According to the common charging process, four 6-EVF-65D batteries are made from each of lead-acid batteries 1 to 10;

[0114] Perform 100% DOD discharge cycle test (25°C) as follows:

[0115] 1. Let it sit for 3 hours

[0116] 2. Discharge at 21.67A until the battery reaches 42V.

[0117] 3. Charge at a constant voltage of 59.2V and a current limit of 21.67A for 6 hours;

[0118] 4. Repeat steps 1-3 until the discharge time drops below 2 hours and 24 minutes.

[0119] The average results are shown in Table 3.

[0120] Table 3 Battery performance parameters

[0121] As shown in Table 3, the 6-EVF-65D batteries prepared using conventional processes for batteries 1 to 10 exhibit slightly lower open circuit voltage and peak capacity, but a 10% increase in cycle life compared to batteries prepared using the positive electrode pastes of Examples 1 to 5 of the present application, compared to Examples 6 to 10 without the addition of zinc dioxide-coated glass fiber. This indicates that the positive electrode paste prepared using the present application can significantly improve the cycle life of the battery while slightly decreasing the open circuit voltage and peak capacity, effectively extending the battery's service life.

[0122] From the 6-EVF-65D batteries prepared by the process of the present application and the conventional process respectively, it can be seen from Table 3 that the process of the present application can increase the number of battery cycles by about 20% while the open circuit voltage and peak capacity of the battery hardly decrease, thereby effectively improving the service life of the battery.

[0123] As shown in Table 3, batteries 1 to 5, made using the present invention's process and conventional processes, respectively, demonstrate that the batteries produced using the present invention's positive electrode lead paste formula and process not only increase the battery's cycle life by approximately 30%, effectively extending its service life, but also slightly improve its open-circuit voltage and peak capacity, further enhancing its overall performance.

[0124] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A lead paste for lead-acid batteries, characterized in that: It includes the following components by weight: Lead powder 100 parts; 10-12 parts water; 9.5-11 parts of sulfuric acid; When the lead paste is used as positive electrode lead paste, it also includes 9 to 11 parts of positive electrode auxiliary materials; When the lead paste is used as negative electrode lead paste, it also includes 25 to 35 parts of negative electrode auxiliary materials.

2. The lead paste for lead-acid batteries according to claim 1, characterized in that: The positive electrode auxiliary material includes the following components by weight: 3-5 parts of green plate powder; 2-3 parts of carbon; 1-1.5 parts of stannous sulfate; 1.5-2.5 parts of antimony trioxide; 0.8-1.5 parts of short fibers; 0.15-0.25 parts of phosphoric acid; 1.5-2 parts of silica gel and 1-1.5 parts of sodium bicarbonate.

3. The lead paste for lead-acid batteries according to claim 2, characterized in that: The short fibers are polypropylene fibers.

4. The lead paste for lead-acid batteries according to claim 2, characterized in that: The positive electrode auxiliary material also includes 1 to 1.5 parts of glass fiber; the surface of the glass fiber is plated with a zinc dioxide coating.

5. The lead paste for lead-acid batteries according to claim 4, characterized in that: The thickness of the zinc dioxide coating is 0.3 μm.

6. The lead paste for lead-acid batteries according to claim 1, characterized in that: The negative electrode auxiliary material comprises the following components by weight: 2.5-4 parts of lignin; 12-15 parts of barium sulfate; 4-8 parts of carbon black; 0.8-1.5 parts of short fibers; 1.5-2 parts of silica gel and 1-1.5 parts of sodium bicarbonate.

7. The lead paste for lead-acid batteries according to claim 6, characterized in that: The short fibers are chopped carbon fibers.

8. A method for preparing the lead paste for lead-acid batteries according to claim 1, characterized in that: First add lead powder, then add positive electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 72°C, cool it down, and stir for 10 to 15 minutes to obtain the positive electrode lead paste.

9. A method for preparing the lead paste for lead-acid batteries according to claim 1, characterized in that: First add lead powder, then add negative electrode auxiliary materials, dry mix and stir for 5 minutes; add the formulated amount of water within 2 minutes, wet mix and stir, add sulfuric acid solution within 13 minutes and stir, raise the temperature to 65°C and cool it down, stir for 10 to 15 minutes to obtain negative electrode lead paste.

10. Use of the lead paste for lead-acid batteries according to claim 1 in the field of flooded batteries or tubular batteries.

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