A lead paste formula for improving low-temperature performance of lead-acid batteries and a preparation method thereof

Abstract

The present invention provides a lead paste formula and preparation method for improving the low-temperature performance of lead-acid batteries. The lead paste formula includes positive electrode lead paste and negative electrode lead paste. The positive electrode lead paste includes the following components: lead powder, deionized water, 50% sulfuric acid solution, short fibers, spherical graphite, hexa(phenylethynyl)benzene, and red lead; the negative electrode lead paste formula includes the following components: lead powder, deionized water, 50% sulfuric acid solution, carbon fibers, barium sulfate, lignin, a bipyridine cobalt complex, and humic acid. Hexa(phenylethynyl)benzene can increase the wettability and porosity of active materials, thereby improving the utilization rate of active materials and battery capacity; the bipyridine cobalt complex can catalyze the recombination of oxygen and hydrogen into water, reducing water consumption in the electrode liquid.

Description

Technical Field

[0001] The present invention relates to the field of lead-acid batteries, and in particular to a lead paste formula for improving the low-temperature performance of lead-acid batteries and a preparation method thereof. Background Art

[0002] Lead-acid batteries have a history of over 150 years. Compared to nickel-metal hydride and lithium-ion batteries, they offer advantages such as safety, reliability, mature technology, low price, and high recycling rates. Consequently, lead-acid batteries continue to play an irreplaceable and significant role in the national economy, widely used in communications, energy storage, and power generation.

[0003] However, the capacity and charge acceptance of lead-acid batteries decrease significantly in low temperature environments. The main reason is that when the ambient temperature is low, the solubility of lead sulfate in the electrolyte decreases rapidly, and a large amount of lead sulfate crystals precipitate from the electrolyte. These lead sulfate crystals will grow into larger lead sulfate crystals that are more insoluble and difficult to be converted into lead and lead dioxide, causing the negative electrode to passivate, making it difficult to charge the lead-acid battery and reducing its capacity. Summary of the Invention

[0004] Based on the above technical problems, the present invention provides a lead paste formula and a preparation method for improving the low-temperature performance of lead-acid batteries.

[0005] The technical solution provided by the present invention is:

[0006] A lead paste formula for improving the low-temperature performance of a lead-acid battery, comprising a positive lead paste and a negative lead paste;

[0007] A positive electrode lead paste comprising the following components in parts by weight: 900-1100 parts of lead powder, 100-120 parts of deionized water, 70-100 parts of a 50% sulfuric acid solution, 0.6-1.2 parts of short fibers, 1-4 parts of spherical graphite, 1.5-4.5 parts of hexa(phenylethynyl)benzene, and 60-80 parts of red lead;

[0008] The negative electrode lead paste comprises the following components in parts by weight: 900-1100 parts of lead powder, 90-110 parts of deionized water, 70-100 parts of a 50% sulfuric acid solution by mass, 0.6-0.9 parts of carbon fiber, 5-7 parts of barium sulfate, 2-4 parts of lignin, 1.5-4.5 parts of a bipyridine cobalt complex, and 0.6-1 part of humic acid.

[0009] Specifically, the positive electrode lead paste includes the following components in parts by weight: 1000 parts of lead powder, 110 parts of deionized water, 85 parts of 50% sulfuric acid solution by mass percentage, 0.9 parts of short fibers, 3 parts of spherical graphite, 3 parts of hexa(phenylethynyl)benzene, and 70 parts of red lead.

[0010] Specifically, the negative electrode lead paste includes the following components in parts by weight: 1000 parts of lead powder, 100 parts of deionized water, 85 parts of 50% sulfuric acid solution by mass percentage, 0.75 parts of carbon fiber, 6 parts of barium sulfate, 3 parts of lignin, 3 parts of bipyridine cobalt complex, and 0.8 parts of humic acid.

[0011] The present invention also provides a method for preparing positive electrode lead paste, comprising the following steps:

[0012] Step 1: Weigh the raw material components according to the raw material composition of the positive electrode lead paste and set aside;

[0013] Step 2: Add lead powder, short fibers, spherical graphite, hexa(phenylethynyl)benzene and red lead into a paste mixer and dry-mix for 5-15 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 5-9 minutes.

[0014] Step 3: Add 50% sulfuric acid solution by mass to the paste making machine while stirring. The adding process takes 15-25 minutes at a temperature of 55-65°C. After the addition is completed, continue stirring for 10-20 minutes to obtain the positive electrode lead paste.

[0015] The present invention also provides a method for preparing negative electrode lead paste, comprising the following steps:

[0016] Step 1: Weigh the raw material components according to the raw material composition of the lead-acid battery negative electrode lead paste and set aside;

[0017] Step 2: Add lead powder, carbon fiber, barium sulfate, lignin, bipyridine cobalt complex and humic acid into a paste mixer and stir for 5-15 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 5-9 minutes.

[0018] Step 3: Add 50% sulfuric acid solution by mass to the paste making machine while stirring. The adding process takes 15-25 minutes at a temperature of 55-65°C. After the addition is completed, continue stirring for 10-20 minutes to obtain the negative electrode lead paste.

[0019] The bipyridine cobalt complex is an organic metal framework material, and its preparation method is as follows:

[0020] 0.5 mmol CoCl2·6H2O, 1.0 mmol sodium benzoate, 0.5 mmol 5,5'-2,2'-bipyridine and 10 mL methanol were added to a container, stirred at room temperature for 24 hours and then filtered. The filtrate was layered and diffused with 20 ml ether. After standing for 7 days, it was filtered and dried to obtain the product bipyridine cobalt complex.

[0021] Beneficial effects:

[0022] The present invention provides a lead paste formula for improving the low-temperature performance of a lead-acid battery, comprising a positive electrode lead paste and a negative electrode lead paste. The positive electrode lead paste contains hexa(phenylethynyl)benzene, which has good electrical conductivity, can reduce the internal resistance of the positive plate, moderate the polarization strength of the positive electrode, and can increase the wettability and porosity of the active material, thereby improving the utilization rate of the active material and the battery capacity. The cobalt bipyridine complex in the negative electrode lead paste has good electrocatalytic effect, can adsorb and transport oxygen molecules while catalyzing the recombining of oxygen and hydrogen into water, greatly improving the efficiency of the recombining of hydrogen and oxygen into water, and reducing the consumption of water in the electrolyte. DETAILED DESCRIPTION

[0023] Example 1

[0024] The lead paste formula provided by the present invention for improving the low-temperature performance of a lead-acid battery includes positive electrode lead paste and negative electrode lead paste.

[0025] The formula of the positive electrode lead paste includes the following components in parts by weight: 900 parts of lead powder, 100 parts of deionized water, 70 parts of 50% sulfuric acid solution by mass percentage, 0.6 parts of short fibers, 1 part of spherical graphite, 1.5 parts of hexa(phenylethynyl)benzene, and 60 parts of red lead.

[0026] The positive electrode lead paste preparation method comprises the following steps:

[0027] Step 1: Weigh the raw material components according to the raw material composition of the lead-acid battery positive electrode lead paste and set aside;

[0028] Step 2: Add lead powder, short fibers, spherical graphite, hexa(phenylethynyl)benzene and red lead into a paste mixer and stir for 5 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 5 minutes.

[0029] Step 3: Add 50% sulfuric acid solution by mass to the paste mixer while stirring. The adding time is 15 minutes and the temperature of the adding process is 55°C. After the addition is completed, continue stirring for 10 minutes to obtain the positive electrode lead paste.

[0030] The formula of the negative electrode lead paste includes the following components in parts by weight: 900 parts of lead powder, 90 parts of deionized water, 70 parts of 50% sulfuric acid solution by mass percentage, 0.6 parts of carbon fiber, 5 parts of barium sulfate, 2 parts of lignin, 1.5 parts of bipyridine cobalt complex, and 0.6 parts of humic acid.

[0031] The bipyridine cobalt complex is an organic metal framework material, and its preparation method is as follows:

[0032] 0.5 mmol CoCl2·6H2O, 1.0 mmol sodium benzoate, 0.5 mmol 5,5'-2,2'-bipyridine and 10 mL methanol were added to a 50 mL round-bottom flask, stirred at room temperature for 24 h and then filtered. The filtrate was diffused with 20 mL ether and allowed to stand for 7 days before being filtered and dried to obtain the product bipyridine cobalt complex.

[0033] The method for preparing negative electrode lead paste comprises the following steps:

[0034] Step 1: Weigh the raw material components according to the raw material composition of the lead-acid battery negative electrode lead paste and set aside;

[0035] Step 2: Add lead powder, carbon fiber, barium sulfate, lignin, bipyridine cobalt complex and humic acid into a paste mixer and stir for 5 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 5 minutes.

[0036] Step 3: Add 50% sulfuric acid solution by mass to the paste mixer while stirring. The adding time is 15 minutes and the temperature of the adding process is 55°C. After the addition is completed, continue stirring for 10 minutes to obtain the negative electrode lead paste.

[0037] Example 2

[0038] The lead paste formula provided by the present invention for improving the low-temperature performance of a lead-acid battery includes positive electrode lead paste and negative electrode lead paste.

[0039] The positive electrode lead paste formula includes the following components in parts by weight: 1000 parts of lead powder, 110 parts of deionized water, 85 parts of 50% sulfuric acid solution by mass percentage, 0.9 parts of short fibers, 3 parts of spherical graphite, 3 parts of hexa(phenylethynyl)benzene, and 70 parts of red lead.

[0040] The method for preparing the positive electrode lead paste comprises the following steps:

[0041] Step 1: Weigh the raw material components according to the raw material composition of the positive electrode lead paste and set aside;

[0042] Step 2: Add lead powder, short fibers, spherical graphite, hexa(phenylethynyl)benzene and red lead into a paste mixer and stir for 10 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 7 minutes.

[0043] Step 3: Add 50% sulfuric acid solution by mass to the paste mixer while stirring. The adding time is 20 minutes and the temperature of the adding process is 60°C. After the addition is completed, continue stirring for 15 minutes to obtain the positive electrode lead paste.

[0044] The negative electrode lead paste comprises the following components in parts by weight: 1000 parts of lead powder, 100 parts of deionized water, 85 parts of a 50% sulfuric acid solution by mass, 0.75 parts of carbon fiber, 6 parts of barium sulfate, 3 parts of lignin, 3 parts of a bipyridine cobalt complex, and 0.8 parts of humic acid.

[0045] The bipyridine cobalt complex is an organic metal framework material, and its preparation method is as follows:

[0046] 0.5 mmol CoCl2·6H2O, 1.0 mmol sodium benzoate, 0.5 mmol 5,5'-2,2'-bipyridine and 10 mL methanol were added to a 50 mL round-bottom flask, stirred at room temperature for 24 h and then filtered. The filtrate was diffused with 20 mL ether and allowed to stand for 7 days before being filtered and dried to obtain the product bipyridine cobalt complex.

[0047] The negative electrode lead paste preparation method comprises the following steps:

[0048] Step 1: Weigh the raw material components according to the raw material composition of the lead-acid battery negative electrode lead paste and set aside;

[0049] Step 2: Add lead powder, carbon fiber, barium sulfate, lignin, bipyridine cobalt complex and humic acid into a paste mixer and stir for 5-15 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 5-9 minutes.

[0050] Step 3: Add 50% sulfuric acid solution by mass to the paste making machine while stirring. The adding process takes 15-25 minutes at a temperature of 55-65°C. After the addition is completed, continue stirring for 10-20 minutes to obtain the negative electrode lead paste.

[0051] Example 3

[0052] The lead paste formula provided by the present invention for improving the low-temperature performance of a lead-acid battery includes positive electrode lead paste and negative electrode lead paste.

[0053] The positive electrode lead paste formula includes the following components in parts by weight: 1100 parts of lead powder, 120 parts of deionized water, 100 parts of 50% sulfuric acid solution by mass percentage, 1.2 parts of short fibers, 4 parts of spherical graphite, 4.5 parts of hexa(phenylethynyl)benzene, and 80 parts of red lead.

[0054] The method for preparing the positive electrode lead paste comprises the following steps:

[0055] Step 1: Weigh the raw material components according to the raw material composition of the positive electrode lead paste and set aside;

[0056] Step 2: Add lead powder, short fibers, spherical graphite, hexa(phenylethynyl)benzene and red lead into a paste mixer and dry-mix for 15 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 9 minutes.

[0057] Step 3: Add 50% sulfuric acid solution by mass to the paste mixer while stirring. The adding time is 25 minutes and the temperature of the adding process is 65°C. After the addition is completed, continue stirring for 20 minutes to obtain the positive electrode lead paste.

[0058] The negative electrode lead paste formula includes the following components in parts by weight: 1100 parts of lead powder, 110 parts of deionized water, 100 parts of a 50% sulfuric acid solution by mass, 0.9 parts of carbon fiber, 7 parts of barium sulfate, 4 parts of lignin, 4.5 parts of a bipyridine cobalt complex, and 1 part of humic acid.

[0059] The bipyridine cobalt complex is an organic metal framework material, and its preparation method is as follows:

[0060] 0.5 mmol CoCl2·6H2O, 1.0 mmol sodium benzoate, 0.5 mmol 5,5'-2,2'-bipyridine and 10 mL methanol were added to a 50 mL round-bottom flask, stirred at room temperature for 24 h and then filtered. The filtrate was diffused with 20 mL ether and allowed to stand for 7 days before being filtered and dried to obtain the product bipyridine cobalt complex.

[0061] The negative electrode lead paste preparation method comprises the following steps:

[0062] Step 1: Weigh the raw material components according to the raw material composition of the lead-acid battery negative electrode lead paste and set aside;

[0063] Step 2: Add lead powder, carbon fiber, barium sulfate, lignin, bipyridine cobalt complex and humic acid into a paste mixer and stir for 15 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 9 minutes.

[0064] Step 3: Add 50% sulfuric acid solution by mass to the paste mixer while stirring. The adding time is 25 minutes and the temperature of the adding process is 65°C. After the addition is completed, continue stirring for 20 minutes to obtain the negative electrode lead paste.

[0065] Comparative Example 1

[0066] The lead paste formula provided by the present invention for improving the low-temperature performance of a lead-acid battery includes positive electrode lead paste and negative electrode lead paste.

[0067] The positive electrode lead paste lacks hexa(phenylethynyl)benzene, and the rest is the same as in Example 2.

[0068] The method for preparing the positive electrode lead paste comprises the following steps:

[0069] Step 1: Weigh the raw material components according to the raw material composition of the positive electrode lead paste and set aside;

[0070] Step 2: Add lead powder, short fibers, spherical graphite and red lead into a paste mixer and dry-mix for 10 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 7 minutes.

[0071] Step 3: Add 50% sulfuric acid solution by mass to the paste mixer while stirring. The adding time is 20 minutes and the temperature of the adding process is 60°C. After the addition is completed, continue stirring for 15 minutes to obtain the positive electrode lead paste.

[0072] The negative electrode lead paste and its preparation method are the same as those in Example 2.

[0073] Comparative Example 2

[0074] The lead paste formula provided by the present invention for improving the low-temperature performance of a lead-acid battery includes positive electrode lead paste and negative electrode lead paste.

[0075] The positive electrode lead paste and its preparation method are the same as those in Example 2.

[0076] The negative electrode lead paste lacks the bipyridine cobalt complex, and the rest is the same as in Example 2.

[0077] The negative electrode lead paste preparation method comprises the following steps:

[0078] Step 1: Weigh the raw material components according to the raw material composition of the lead-acid battery negative electrode lead paste and set aside;

[0079] Step 2: Add lead powder, carbon fiber, barium sulfate, lignin and humic acid into a paste mixer and stir for 5-15 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 5-9 minutes.

[0080] Step 3: Add 50% sulfuric acid solution by mass to the paste making machine while stirring. The adding process takes 15-25 minutes at a temperature of 55-65°C. After the addition is completed, continue stirring for 10-20 minutes to obtain the negative electrode lead paste.

[0081] Comparative Example 3

[0082] The lead paste formula provided by the present invention for improving the low-temperature performance of a lead-acid battery includes positive electrode lead paste and negative electrode lead paste.

[0083] The positive electrode lead paste lacks hexa(phenylethynyl)benzene, and the rest is the same as in Example 2.

[0084] The method for preparing the positive electrode lead paste comprises the following steps:

[0085] Step 1: Weigh the raw material components according to the raw material composition of the positive electrode lead paste and set aside;

[0086] Step 2: Add lead powder, short fibers, spherical graphite and red lead into a paste mixer and dry-mix for 10 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 7 minutes.

[0087] Step 3: Add 50% sulfuric acid solution by mass to the paste mixer while stirring. The adding time is 20 minutes and the temperature of the adding process is 60°C. After the addition is completed, continue stirring for 15 minutes to obtain the positive electrode lead paste.

[0088] The negative electrode lead paste lacks the bipyridine cobalt complex, and the rest is the same as in Example 2.

[0089] The negative electrode lead paste preparation method comprises the following steps:

[0090] Step 1: Weigh the raw material components according to the raw material composition of the lead-acid battery negative electrode lead paste and set aside;

[0091] Step 2: Add lead powder, carbon fiber, barium sulfate, lignin and humic acid into a paste mixer and stir for 5-15 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 5-9 minutes.

[0092] Step 3: Add 50% sulfuric acid solution by mass to the paste making machine while stirring. The adding process takes 15-25 minutes at a temperature of 55-65°C. After the addition is completed, continue stirring for 10-20 minutes to obtain the negative electrode lead paste.

[0093] Comparative Example 4

[0094] The lead paste formula provided by the present invention for improving the low-temperature performance of a lead-acid battery includes positive electrode lead paste and negative electrode lead paste.

[0095] The hexa(phenylethynyl)benzene in the positive electrode lead paste is replaced by graphene, and the rest is the same as in Example 2.

[0096] The method for preparing the positive electrode lead paste comprises the following steps:

[0097] Step 1: Weigh the raw material components according to the raw material composition of the positive electrode lead paste and set aside;

[0098] Step 2: Add lead powder, short fibers, spherical graphite, graphene, and red lead into a paste mixer and dry-mix for 10 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 7 minutes.

[0099] Step 3: Add 50% sulfuric acid solution by mass to the paste mixer while stirring. The adding time is 20 minutes and the temperature of the adding process is 60°C. After the addition is completed, continue stirring for 15 minutes to obtain the positive electrode lead paste.

[0100] The negative electrode lead paste and its preparation method are the same as those in Example 2.

[0101] The positive electrode lead paste and the negative electrode lead paste of the present invention were fixed on the grid of a lead-acid battery to make a lead-acid battery, and the following performance test experiments were carried out:

[0102] 1. Low temperature discharge capacity test

[0103] According to the test method specified in the national standard "GB / T 22473-2008 Energy Storage Lead-acid Battery", after the test battery is fully charged, it is immediately placed in a constant temperature and humidity test chamber. The temperature inside the constant temperature and humidity test chamber is set to 0℃, -10℃, and -20℃, and the humidity is 0. The battery is placed in the environment of 0℃, -10℃, and -20℃ for 12 hours. After 12 hours, the battery is discharged at a rate of 0.5C, and the discharge termination voltage is

[0104] 1.7V, record the discharge capacity as C a , C a That is, the battery's 0.5C discharge capacity at 0℃, -10℃, and -20℃.

[0105] 2. Low temperature cycle capability test

[0106] After fully charging the battery, immediately place it in a constant temperature and humidity test chamber with the temperature set at 0℃, -10℃, and -20℃ and the humidity at 0. The battery is placed in the 0℃, -10℃, and -20℃ environments for 20 hours. Immediately after the placement, the battery is discharged at a rate of 0.5C. When the battery voltage reaches 1.7V, the discharge is terminated and the discharge capacity is recorded as C. b After the discharge is terminated, the battery is charged at a constant current of 1200 mA and a cut-off voltage of 2.4 V in a constant temperature and humidity test chamber at 0°C, -10°C, and -20°C. After the battery reaches the cut-off voltage, the battery is charged at a constant voltage of 2.4 V. Charging is stopped when the charging current drops to 200 mA, which is considered a cycle. The battery is cycled at 0°C, -10°C, and -20°C, and the third discharge capacity C is recorded. b .

[0107] 3. Low temperature charging acceptance test

[0108] According to the test method specified in the national standard "GB / T 22473-2008 Energy Storage Lead-acid Battery", after the battery is fully charged, it is discharged at room temperature with a discharge rate of 0.1C and the discharge current is recorded as 430mA. After the test battery is fully charged, the battery is discharged at a constant current of 430m A for 5 hours. After the discharge, the battery is immediately placed in a constant temperature and humidity test chamber with a temperature of 0℃, -10℃, and -20℃ and a humidity of 0. The battery is placed in an environment of 0℃, -10℃, and -20℃ for 12 hours. After the placement is completed, the battery is immediately charged at a constant voltage of 2.4V and the charging current at the 10th minute is recorded, which is recorded as I ca .

[0109] Table 1. Test results of samples of various embodiments

[0110]

[0111] As shown in Table 1, lead-acid batteries prepared using the lead paste of the present invention have higher low-temperature discharge capacity, low-temperature cycle performance, and low-temperature charge acceptance in low-temperature environments. Using hexa(phenylethynyl)benzene, which has a similar physical and chemical structure to graphene but is cheaper, can surpass the performance of graphene. This may be because the substituents on the benzene rings in hexa(phenylethynyl)benzene give it a larger three-dimensional structure, resulting in a more excellent void structure.

Claims

1. A lead paste formula for improving the low-temperature performance of lead-acid batteries, characterized in that: Including positive lead paste and negative lead paste; A positive electrode lead paste comprising the following components in parts by weight: 900-1100 parts of lead powder, 100-120 parts of deionized water, 70-100 parts of a 50% sulfuric acid solution, 0.6-1.2 parts of short fibers, 1-4 parts of spherical graphite, 1.5-4.5 parts of hexa(phenylethynyl)benzene, and 60-80 parts of red lead; The negative electrode lead paste comprises the following components in parts by weight: 900-1100 parts of lead powder, 90-110 parts of deionized water, 70-100 parts of a 50% sulfuric acid solution by mass, 0.6-0.9 parts of carbon fiber, 5-7 parts of barium sulfate, 2-4 parts of lignin, 1.5-4.5 parts of a bipyridine cobalt complex, and 0.6-1 part of humic acid.

2. A lead paste formula for improving the low temperature performance of a lead-acid battery according to claim 1, characterized in that: The positive electrode lead paste comprises the following components in parts by weight: 1000 parts of lead powder, 110 parts of deionized water, 85 parts of 50% sulfuric acid solution by mass percentage, 0.9 parts of short fibers, 3 parts of spherical graphite, 3 parts of hexa(phenylethynyl)benzene, and 70 parts of red lead.

3. The lead paste formula for improving the low temperature performance of lead-acid batteries according to claim 1, characterized in that: The negative electrode lead paste comprises the following components in parts by weight: 1000 parts of lead powder, 100 parts of deionized water, 85 parts of a 50% sulfuric acid solution by mass, 0.75 parts of carbon fiber, 6 parts of barium sulfate, 3 parts of lignin, 3 parts of a bipyridine cobalt complex, and 0.8 parts of humic acid.

4. The method for preparing a lead paste formula for improving the low-temperature performance of a lead-acid battery according to claim 1, characterized in that: A method for preparing positive electrode lead paste comprises the following steps: Step 1: Weigh the raw material components according to the raw material composition of the positive electrode lead paste and set aside; Step 2: Add lead powder, short fibers, spherical graphite, hexa(phenylethynyl)benzene and red lead into a paste mixer and dry-mix for 5-15 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 5-9 minutes. Step 3: Add 50% sulfuric acid solution by mass to the paste making machine while stirring. The adding process takes 15-25 minutes at a temperature of 55-65°C. After the addition is completed, continue stirring for 10-20 minutes to obtain the positive electrode lead paste.

5. The method for preparing a lead paste formula for improving the low-temperature performance of a lead-acid battery according to claim 1, characterized in that: A method for preparing negative electrode lead paste comprises the following steps: Step 1: Weigh the raw material components according to the raw material composition of the lead-acid battery negative electrode lead paste and set aside; Step 2: Add lead powder, carbon fiber, barium sulfate, lignin, bipyridine cobalt complex and humic acid into a paste mixer and stir for 5-15 minutes; then add deionized water into the paste mixer while stirring. The deionized water addition process takes 5-9 minutes. Step 3: Add 50% sulfuric acid solution by mass to the paste making machine while stirring. The adding process takes 15-25 minutes at a temperature of 55-65°C. After the addition is completed, continue stirring for 10-20 minutes to obtain the negative electrode lead paste.

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