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A preparation method of a three-dimensional graphene-titanium-based fiber-lead powder lead-acid battery negative plate

A lead-acid battery and graphene technology, applied in the direction of lead-acid battery, lead-acid battery construction, battery electrodes, etc., can solve the problems of complex graphene-based hydrogel process, insufficient performance improvement, and difficulty in industrial production. Achieve the effects of inhibiting irreversible sulfation, preventing shedding, improving specific capacity and service life

Active Publication Date: 2021-05-14
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method not only has complicated steps, but also needs to add a strong reducing agent, which increases the cost of the battery and the performance improvement is not significant enough.
Chinese patent CN201210259791.0 discloses a graphene-based hydrogel super battery plate. Since graphene is hydrophobic, it is difficult to combine with the active materials of the positive and negative plates of the lead-acid battery without treatment, and the The graphene-based hydrogel prepared by the method is complex and difficult to be used in industrial production

Method used

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  • A preparation method of a three-dimensional graphene-titanium-based fiber-lead powder lead-acid battery negative plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0023] Graphene was placed in a mixed solution of concentrated sulfuric acid with a mass fraction of 70% and concentrated nitric acid with a mass fraction of 68%. After washing to neutrality, hydrophilic graphene is obtained after natural air drying.

[0024] The hydrophilic graphene 1.5g obtained after air-drying is dispersed in deionized water, and 15 Kg of lead powder with a particle diameter of 0.5 μm is added to stir and disperse to obtain a graphene-lead powder dispersion.

[0025] The graphene-lead powder dispersion was quickly frozen with liquid nitrogen for 1 min, completely dried, placed in a tube furnace, filled with argon, and heat-treated at 400 °C for 6 h to obtain a graphene-lead powder negative electrode composite with a three-dimensional network structure.

[0026] Add 12 Kg of graphene-lead powder negative electrode composite material with three-dimensional network structure, 37.5 g of acetylene black, 120 g of barium sulfate, 18 g of lignin, 24 g of humic ac...

Embodiment 2）

[0030] Graphene was placed in a mixed solution with a mass fraction of 98% concentrated sulfuric acid and 65% concentrated nitric acid, the volume ratio of concentrated sulfuric acid to concentrated nitric acid was 3:1, refluxed at 80 °C for 4 h, suction filtered, deionized water After washing to neutrality, hydrophilic graphene is obtained after natural air drying.

[0031] The hydrophilic graphene 150g obtained after air-drying is dispersed in deionized water, and 15 Kg of lead powder with a particle diameter of 10 μm is added to stir and disperse to obtain a graphene-lead powder dispersion.

[0032] The graphene-lead powder dispersion was quickly frozen with liquid nitrogen for 5 minutes, completely dried, placed in a tube furnace, filled with argon mixed gas, and heat-treated at 600 °C for 4 hours to obtain a graphene-lead powder negative electrode composite material with a three-dimensional network structure .

[0033] Add 12 Kg of graphene-lead powder negative electrode...

Embodiment 3）

[0037] Graphene was placed in a mixed solution with a mass fraction of 98% concentrated sulfuric acid and 97.5% concentrated nitric acid, the volume ratio of concentrated sulfuric acid to concentrated nitric acid was 4:1, refluxed at 100 °C for 2 h, suction filtered, deionized water After washing to neutrality, hydrophilic graphene is obtained after natural air drying.

[0038] The hydrophilic graphene 60g obtained after air-drying was dispersed in deionized water, and 15 Kg of lead powder with a particle diameter of 20 μm was added to stir and disperse to obtain a graphene-lead powder dispersion.

[0039] The graphene-lead powder dispersion was quickly frozen with liquid nitrogen for 20 min, completely dried, placed in a tube furnace, fed with hydrogen, and heat-treated at 800 °C for 2 h to obtain a graphene-lead powder negative electrode composite with a three-dimensional network structure.

[0040] Add 12 Kg of graphene-lead powder negative electrode composite material with...

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Abstract

The invention relates to a preparation method of a three-dimensional graphene-titanium-based fiber-lead powder lead-acid storage battery negative plate. In the present invention, graphene is placed in a mixed solution of concentrated sulfuric acid and concentrated nitric acid for hydrophilic treatment, lead powder is added to stir and disperse, liquid nitrogen is quickly frozen and dried, and graphene-lead powder is obtained after heat treatment at a certain temperature and a protective atmosphere Negative electrode composite material; add graphene-lead powder negative electrode composite material, acetylene black, barium sulfate, lignin, humic acid and polytetrafluoroethylene emulsion into a paste machine according to a certain ratio and dry-mix to obtain a powder; the powder Add the body to the dispersion liquid containing titanium-based fibers, add sulfuric acid and deionized water to control the apparent density, and obtain the negative electrode paste; apply the negative electrode paste to the negative electrode grid, and obtain the negative electrode plate of the lead-acid battery after curing. The use of three-dimensional graphene-titanium-based fiber-lead powder composite materials for the preparation of negative plates can not only increase the utilization of lead powder, reduce the internal resistance of the battery, but also increase the specific capacity of the negative plate of the battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of lead-acid battery negative plates, and in particular relates to a preparation method of a three-dimensional graphene-titanium-based fiber-lead powder lead-acid battery negative plate. Background technique [0002] Compared with the existing nickel-metal hydride batteries and lithium-ion batteries, lead-acid batteries have the advantages of low cost, safety and reliability, mature production technology, long service life, easy recycling, recycling and stable electrical performance, etc., and become an electric vehicle (EV) battery. Best option for commercialization with start-stop batteries. Most start-stop batteries for EVs operate under high-rate partial state of charge (HRPSoC), while traditional lead-acid batteries operate under this condition, the negative plate will gradually accumulate large particles of lead sulfate crystals, forming a hard lead sulfate layer. The charging efficienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/57H01M4/62H01M4/73H01M10/12
CPCH01M4/362H01M4/57H01M4/625H01M4/73H01M10/12Y02E60/10Y02P70/50
Inventor 暴宁钟何大方白凤娟沈丽明
Owner NANJING TECH UNIV
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