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Three-dimensional graphene-titanium-based fiber-lead-acid battery negative plate preparation method

A lead-acid battery, graphene technology, applied in lead-acid battery, lead-acid battery construction, battery electrodes and other directions, can solve the problems of complex graphene-based hydrogel process, complicated steps, insufficient performance improvement, etc. Irreversible sulfation phenomenon, improving specific capacity and service life, and enriching the effect of electronic conduction channels

Active Publication Date: 2019-01-15
NANJING UNIV OF TECH
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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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  • Three-dimensional graphene-titanium-based fiber-lead-acid battery negative plate preparation method

Examples

Experimental program
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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 three-dimensional graphene-titanium-based fiber-lead-acid battery negative plate preparation method. The graphene is placed in a mixed solution of concentrated sulfuric acidand concentrated nitric acid for hydrophilic treatment, lead powder is added for stirring and dispersing, liquid nitrogen is rapidly frozen and dried, and the graphene is obtained after heat treatment at a certain temperature and a protective atmosphere. Lead powder anode composite; Graphene-A lead pow negative electrode composite material, acetylene black, barium sulfate, lignin, humic acid andpolytetrafluoroethylene emulsion are added into a paste machine accord to a certain proportion and are evenly dry mixed to obtain powder; The powder is added into a dispersion containing titanium-based fibers, and sulfuric acid and deionized water are added to control the apparent density to obtain a negative electrode lead paste; A lead paste of that negative electrode is coat on the negative electrode grid, and the negative electrode plate of the lead-acid battery is obtained aft solidification. The adoption of three-dimensional graphene-Titanium-based fiber-lead powder composite material inthe preparation of negative plate can not only increase the utilization rate of lead powder and reduce the internal resistance of battery, but also improve the specific capacity of negative plate ofbattery.

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 Applications(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 UNIV OF TECH
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