Positive electrode lead paste, preparation method, positive electrode plate and lead-acid storage battery

Abstract

The invention discloses positive electrode lead paste, a preparation method, a positive electrode plate and a lead-acid storage battery, and relates to the technical field of lead-acid storage batteries. The positive electrode lead paste is prepared from the following components: lead powder; the addition amount of the positive electrode auxiliary material is 0.2-0.5 wt% of the lead powder; the adding amount of the sulfuric acid is 7-9wt% of the lead powder; the addition amount of the water is 10-12wt% of the lead powder; the addition amount of the sodium carboxymethyl cellulose is 0.15-0.25 wt% of the lead powder; and the addition amount of the polytetrafluoroethylene is 0.08-0.12 wt% of the lead powder. Adding a positive electrode auxiliary material, sodium carboxymethyl cellulose and polytetrafluoroethylene into lead powder, and carrying out dry stirring to obtain a powdery mixture; adding water to prepare turbid liquid; adding sulfuric acid and stirring to obtain paste; and cooling and stirring, and discharging the paste when the temperature is reduced to be not more than 50 DEG C to obtain the positive lead paste. According to the lead paste, the CMC and the PTFE are added, and the content of other components in the formula is limited, so that in the prepared lead paste, the bonding force between active substances is higher, and the active substances are not prone to falling off in the later charging and discharging process.

Description

Technical Field

[0001] The present application relates to the technical field, and in particular to positive electrode lead paste, a preparation method, a positive electrode plate and a lead-acid battery. Background Art

[0002] Lead-acid batteries have the advantages of good charging and discharging performance, safety and stability, and low price. They are currently widely used in electric bicycles, electric tricycles, electric vehicles, etc. Although lead-acid batteries are widely used, the bonding force between the active materials in the positive electrode plate is poor and the cycle life needs to be improved.

[0003] By increasing the bonding force of the active material, the active material can be prevented from falling off and losing its function during the charge and discharge process of the battery, thereby increasing the cycle life of the lead-acid battery.

[0004] Therefore, it is necessary to provide a positive electrode lead paste with strong active material bonding force. Summary of the invention

[0005] In order to solve at least one of the above technical problems, a positive lead paste with strong active material bonding force is developed. The present application provides a positive lead paste, a preparation method, a positive electrode plate and a lead-acid battery.

[0006] On the one hand, the present application provides a positive electrode lead paste, which is prepared from the following components:

[0007] Lead powder;

[0008] Positive electrode auxiliary material, the added amount is 0.2-0.5wt% of the lead powder;

[0009] Sulfuric acid, added in an amount of 7-9wt% of the lead powder;

[0010] Water, added in an amount of 10-12wt% of the lead powder;

[0011] Sodium carboxymethyl cellulose, added in an amount of 0.15-0.25wt% of the lead powder;

[0012] Polytetrafluoroethylene, the added amount is 0.08-0.12wt% of the lead powder.

[0013] Optionally, the weight ratio of sodium carboxymethyl cellulose to polytetrafluoroethylene is 1.8 to 2:1.

[0014] Optionally, the positive electrode auxiliary materials include: short fibers, stannous sulfate, antimony trioxide, and red lead;

[0015] in,

[0016] The amount of short fiber added is 0.05-0.15wt% of the lead powder;

[0017] The amount of stannous sulfate added is 0.1 to 0.12 wt% of the lead powder;

[0018] The amount of antimony trioxide added is 0.1-0.3wt% of the lead powder;

[0019] The amount of red lead added is 0.05-0.08wt% of the lead powder.

[0020] Optionally, the oxidation degree of the lead powder is 70% to 80%, the contents of iron, manganese, copper and chlorine in the lead powder are all lower than 5 ppm, and the content of bismuth in the lead powder is lower than 35 ppm.

[0021] Optionally, the short fibers are polyester fibers with a length of 3 to 5 mm and a fineness of 0.5D.

[0022] In a second aspect, the present application provides a method for preparing the above-mentioned positive electrode lead paste, comprising the following steps:

[0023] S1. Adding positive electrode auxiliary materials, sodium carboxymethyl cellulose and polytetrafluoroethylene to lead powder according to the formula amount, and dry-stirring to obtain a powdery mixture;

[0024] The powdery mixture prepared in S2 and S1 is mixed with a formula amount of water to form a suspension;

[0025] S3, adding the formulated amount of sulfuric acid and stirring to obtain a paste;

[0026] S4, cooling and stirring, when the temperature drops to no more than 50°C, the paste is produced to obtain the positive electrode lead paste.

[0027] Optionally, in S1, the dry stirring time is 4 to 8 minutes;

[0028] And / or, in S2, the mixing and stirring time is 4 to 8 minutes;

[0029] and / or, the sulfuric acid solution in S3 is added to the suspension in S2 for 12 to 15 minutes;

[0030] And / or, in S4, the cooling and stirring time is 8 to 12 minutes.

[0031] In a third aspect, the present application provides a positive electrode plate made of the above-mentioned positive electrode lead paste.

[0032] In a fourth aspect, the present application provides a lead-acid battery comprising the above-mentioned positive electrode plate.

[0033] In summary, the present invention includes at least one of the following beneficial technical effects:

[0034] 1. By adding sodium carboxymethyl cellulose and polytetrafluoroethylene and limiting the content relative to other components in the formula, the bonding force between the active substances in the prepared lead paste is stronger, and the active substances are not easy to fall off during the later charging and discharging process;

[0035] 2. Dry mixing is first performed, then deionized water is added for wet mixing, and then acid is added for stirring. The temperature of the lead paste is gradually increased from dry mixing to acid addition and stirring. Then the fan is turned on for exhaust and cooling. Finally, the paste temperature is less than 50°C. The obtained lead paste can significantly improve the adhesion of the lead paste, thereby improving the battery cycle life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Graph showing the discharge cycle of battery 3 and battery 6. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] In the following examples of the present application, the main components involved, unless otherwise specified, were purchased from commercially available products. Specific embodiments

[0040] Example 1

[0041] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0042] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.15 kg of sodium carboxymethyl cellulose and 0.12 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0043] Example 2

[0044] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0045] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.18 kg of sodium carboxymethyl cellulose and 0.11 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0046] Example 3

[0047] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0048] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.20 kg of sodium carboxymethyl cellulose and 0.10 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0049] Example 4

[0050] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0051] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.22 kg of sodium carboxymethyl cellulose and 0.09 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, a paste is obtained to obtain a positive electrode lead paste.

[0052] Example 5

[0053] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0054] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.25 kg of sodium carboxymethyl cellulose and 0.08 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry-stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the mixture is cooled and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0055] Comparative Example 1

[0056] This comparative example is used to prepare a positive electrode lead paste. The difference from Example 1 is that sodium carboxymethyl cellulose and polytetrafluoroethylene are not added in this comparative example. The details are as follows.

[0057] Add 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead) to 100 kg of lead powder, and dry stir for 5 minutes to obtain a powdery mixture; add 10 kg of water and stir for 4 minutes to prepare a suspension; add 8 kg of sulfuric acid within 13 minutes and stir to obtain a paste; cool and stir for 10 minutes, and when the temperature drops to no more than 50°C, take out the paste to obtain a positive electrode lead paste.

[0058] The positive lead paste prepared in the above-mentioned Examples 1 to 5 and Comparative Example 1 is applied to the conductor grid and cured for 4 hours at a temperature of 80°C and a humidity of 100%; then tunnel-cured for 60 hours, with the curing temperature controlled at 65°C and the humidity controlled at 85%; then dried, with the drying temperature controlled at 75°C and the drying time controlled at 16 hours; and the positive electrode plate is obtained. In the cured paste-coated plate, the free lead content is detected to be less than 2%. The positive electrode plates are assembled into lead-acid batteries to obtain lead-acid batteries 1 to 6; and the lead-acid batteries are subjected to discharge cycle tests, and the results are shown in Table 1, where the discharge cycle curves of battery 3 and battery 6 are shown in Table 1. Figure 1 As shown; wherein N is the ratio of CMC weight to PTFE weight.

[0059] Table 1

[0060] Lead-acid batteries Positive lead paste CMC PTFE N Cycle times / times Battery 1 Example 1 0.15 0.12 1.3 498 Battery 2 Example 2 0.18 0.11 1.6 505 Battery 3 Example 3 0.2 0.1 2.0 530 Battery 4 Example 4 0.22 0.09 2.4 501 Battery 5 Example 5 0.25 0.08 3.1 495 Battery 6 Comparative Example 1 / / / 460

[0061] It can be seen from Table 1 that the number of cycles of lead-acid batteries 1 to 5 assembled with the positive lead paste prepared in the present application is significantly improved compared with the lead-acid battery 6 assembled with the positive lead paste prepared in Comparative Example 1, and the improvement is as high as 15%, which is much higher than 7 to 10% in other embodiments. This shows that in the positive lead paste prepared in the present application, the active material has a strong bonding force, is not easy to fall off and fail during the charge and discharge process, and the prepared lead-acid battery has a longer service life.

[0062] By further analyzing Table 1, it can be found that the performance of battery 3 is better than that of other embodiments. The inventors prepared the following Examples 6 to 16 to analyze the effect of the weight ratio of sodium carboxymethyl cellulose to polytetrafluoroethylene on the performance of the positive electrode lead paste.

[0063] Example 6

[0064] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0065] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.22 kg of sodium carboxymethyl cellulose and 0.1 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0066] Example 7

[0067] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0068] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.22 kg of sodium carboxymethyl cellulose and 0.11 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0069] Example 8

[0070] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0071] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.22 kg of sodium carboxymethyl cellulose and 0.12 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0072] Example 9

[0073] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0074] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.20 kg of sodium carboxymethyl cellulose and 0.09 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0075] Example 10

[0076] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0077] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.20 kg of sodium carboxymethyl cellulose and 0.11 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0078] Embodiment 11

[0079] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0080] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.20 kg of sodium carboxymethyl cellulose and 0.12 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0081] Example 12

[0082] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0083] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.18 kg of sodium carboxymethyl cellulose and 0.08 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, a paste is obtained to obtain a positive electrode lead paste.

[0084] Example 13

[0085] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0086] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.18 kg of sodium carboxymethyl cellulose and 0.09 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0087] Embodiment 14

[0088] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0089] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.18 kg of sodium carboxymethyl cellulose and 0.10 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0090] Embodiment 15

[0091] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0092] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.15 kg of sodium carboxymethyl cellulose and 0.08 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0093] Example 16

[0094] This embodiment is used to prepare a positive electrode lead paste, and the details are as follows.

[0095] 0.4 kg of positive electrode auxiliary materials (including 0.1 kg of polyester staple fiber, 0.1 kg of stannous sulfate, 0.15 kg of antimony trioxide, and 0.05 kg of red lead), 0.15 kg of sodium carboxymethyl cellulose and 0.09 kg of polytetrafluoroethylene are added to 100 kg of lead powder, and dry stirred for 5 minutes to obtain a powdery mixture; 10 kg of water is added and stirred for 4 minutes to prepare a suspension; 8 kg of sulfuric acid is added within 13 minutes and stirred to obtain a paste; the temperature is reduced and stirred for 10 minutes, and when the temperature drops to no more than 50°C, the paste is obtained to obtain a positive electrode lead paste.

[0096] The positive lead paste prepared in the above-mentioned Examples 6 to 16 was coated on the conductor grid and cured for 4 hours at a temperature of 80°C and a humidity of 100%; then tunnel cured for 60 hours, with the curing temperature controlled at 65°C and the humidity controlled at 85%; then dried, with the drying temperature controlled at 75°C and the time controlled at 16 hours; and the positive electrode plate was obtained. The free lead content in the cured paste-coated plate was detected to be less than 2%. The positive electrode plates were assembled into lead-acid batteries to obtain lead-acid batteries 7 to 17; and the lead-acid batteries were subjected to discharge cycle tests, and the results are shown in Table 2.

[0097] Table 2

[0098] Lead-acid batteries Positive lead paste CMC PTFE N Cycle times / times Battery 7 Example 6 0.22 0.1 2.2 504 Battery 8 Example 7 0.22 0.11 2.0 531 Battery 9 Example 8 0.22 0.12 1.8 495 Battery 10 Example 9 0.2 0.09 2.2 494 Battery 11 Example 10 0.2 0.11 1.8 514 Battery 12 Embodiment 11 0.2 0.12 1.7 502 Battery 13 Example 12 0.18 0.08 2.3 501 Battery 14 Example 13 0.18 0.09 2.0 535 Battery 15 Embodiment 14 0.18 0.1 1.8 513 Battery 16 Embodiment 15 0.15 0.08 1.9 509 Battery 17 Example 16 0.15 0.09 1.7 503

[0099] It can be seen from Table 2 that when the weight ratio of sodium carboxymethyl cellulose to polytetrafluoroethylene in the technical solution of the present application is in the range of 1.8 to 2:1, the number of discharge cycles of the lead-acid battery corresponding to the prepared positive lead paste is increased by at least 10% relative to that of Comparative Example 1, especially when the weight ratio of sodium carboxymethyl cellulose to polytetrafluoroethylene is 2:1, the number of discharge cycles of the lead-acid battery corresponding to the prepared positive lead paste can be increased by more than 15% relative to that of Comparative Example 1. This indicates that the weight ratio of sodium carboxymethyl cellulose to polytetrafluoroethylene has an effect on the binding force of the active substance in the positive lead paste. When the weight ratio of sodium carboxymethyl cellulose to polytetrafluoroethylene is in the range of 1.8 to 2:1, the binding force of the active substance in the prepared positive lead paste is stronger, and it is less likely to fall off and fail during later use, and the service life of the prepared lead-acid battery is longer.

[0100] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A positive electrode lead paste, characterized in that: Prepared by including the following components: Lead powder; Positive electrode auxiliary material, the added amount is 0.2-0.5wt% of the lead powder; Sulfuric acid, added in an amount of 7-9wt% of the lead powder; Water, added in an amount of 10-12wt% of the lead powder; Sodium carboxymethyl cellulose, added in an amount of 0.15-0.25wt% of the lead powder; Polytetrafluoroethylene, the added amount is 0.08-0.12wt% of the lead powder.

2. The positive electrode lead paste according to claim 1, characterized in that: The weight ratio of the sodium carboxymethyl cellulose to polytetrafluoroethylene is 1.8 to 2:

1.

3. The positive electrode lead paste according to claim 1, characterized in that: The positive electrode auxiliary materials include: short fibers, stannous sulfate, antimony trioxide, and red lead; wherein: The amount of short fiber added is 0.05-0.15wt% of the lead powder; The amount of stannous sulfate added is 0.1 to 0.12 wt% of the lead powder; The amount of antimony trioxide added is 0.1-0.3wt% of the lead powder; The amount of red lead added is 0.05-0.08wt% of the lead powder.

4. The positive electrode lead paste according to claim 1, characterized in that: The oxidation degree of the lead powder is 70% to 80%, the contents of iron, manganese, copper and chlorine in the lead powder are all lower than 5ppm, and the content of bismuth in the lead powder is lower than 35ppm.

5. The positive electrode lead paste according to claim 1, characterized in that: The short fibers are polyester fibers with a length of 3 to 5 mm and a fineness of 0.5D.

6. A method for preparing the positive electrode lead paste according to claim 1, characterized in that: The following steps are involved: S1. Adding positive electrode auxiliary materials, sodium carboxymethyl cellulose and polytetrafluoroethylene to lead powder according to the formula amount, and dry-stirring to obtain a powdery mixture; The powdery mixture prepared in S2 and S1 is mixed with a formula amount of water to form a suspension; S3, adding the formulated amount of sulfuric acid and stirring to obtain a paste; S4, cooling and stirring, when the temperature drops to no more than 50°C, the paste is obtained to obtain the positive electrode lead paste.

7. The preparation method according to claim 1, characterized in that: In S1, the dry stirring time is 4 to 8 minutes; And / or, in S2, the mixing and stirring time is 4 to 8 minutes; and / or, the sulfuric acid solution in S3 is added to the suspension in S2 for 12 to 15 minutes; And / or, in S4, the cooling and stirring time is 8 to 12 minutes.

8. A positive electrode plate, characterized in that: Made from the positive electrode lead paste described in claim 1.

9. A lead-acid battery, characterized in that: The invention comprises the positive electrode plate as claimed in claim 8.

Images