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Preparation method of lead graphene battery negative plate

A battery negative electrode and graphene technology, applied in the direction of lead-acid battery electrodes, etc., can solve the problems of difficulty in uniform distribution, poor dispersion of graphene materials, and failure to achieve the desired effect

Active Publication Date: 2019-06-18
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the hydrogen evolution overpotential of the graphene material itself is too high, and its hydrogen evolution overpotential can be improved after it is combined with a metal oxide.
However, the oxidation-reduction potential of graphene is too different from the oxidation-reduction potential of lead-acid batteries, so adding graphene metal oxides directly to lead-acid batteries cannot achieve the desired effect, such as patent 201210453526.6
Graphene material itself has poor dispersion, and it is difficult to evenly distribute it in battery materials when it is directly dissolved in water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of the lead graphene battery negative plate of this embodiment includes steps S1-S5. details as follows.

[0025] S1. Weigh 10 mg of graphene oxide and add it to 50 ml of dimethylformamide (DMF), heat the solution to 50° C., keep stirring for 3 hours, and then centrifuge and dry to obtain graphene oxide with a negatively charged surface modified by functional groups.

[0026] S2, the graphene oxide that step S1 obtains is all dispersed into 0.5mol / L Pb(NO of 100ml 3 ) 2 In the solution, ultrasonication was performed for 1 hour, followed by continuous stirring for 2 hours to obtain graphene oxide with lead ions adsorbed on the surface.

[0027] S3. Transfer the solution of the above step S2 into a hydrothermal kettle, and conduct a hydrothermal reaction at 160° C. for 6 hours. Obtain reduced graphene lead oxide composite material.

[0028] S4, the graphene lead oxide composite material that step S3 obtains is all dispersed in the 2ml sulfuric a...

Embodiment 2

[0031] The preparation method of the lead graphene battery negative plate of this embodiment includes steps S1-S5. details as follows.

[0032] S1. Weigh 7 mg of graphene oxide and add it to 50 ml of dimethylformamide (DMF), heat the solution to 50° C., keep stirring for 3 hours, and then centrifuge and dry to obtain functional group-modified graphene oxide with a negatively charged surface.

[0033] S2, all the graphene oxide obtained in step S1 is dispersed into 0.5mol / L RbNO 3 In the solution, ultrasonication was performed for 1 hour, followed by continuous stirring for 2 hours to obtain graphene oxide with rubidium ions adsorbed on the surface.

[0034] S3. Transfer the solution of the above step S2 into a hydrothermal kettle, and conduct a hydrothermal reaction at 160° C. for 6 hours. A reduced graphene rubidium oxide composite material is obtained.

[0035] S4, the graphene rubidium oxide composite material that step S3 obtains is all dispersed in the 2ml sulfuric aci...

Embodiment 3

[0038] S1. Weigh 1 mg of graphene oxide and add it to 50 ml of nitrogen-methylpyrrolidone, heat the solution to 55° C., keep stirring for 5 hours, and then centrifuge and dry to obtain graphene oxide with a negatively charged surface modified by functional groups.

[0039] S2, disperse 1mg of graphene oxide obtained in step S1 into 50ml of 0.2mol / L MnCl 2 The solution was ultrasonicated for 1 hour, and then continuously stirred for 2 hours to obtain graphene oxide with manganese ions adsorbed on the surface.

[0040] S3. Transfer the solution of the above step S2 into a hydrothermal kettle, and conduct a hydrothermal reaction at 170° C. for 3 hours. A reduced graphene manganese oxide composite material is obtained.

[0041] S4. Disperse 10 mg of the graphene manganese oxide composite material obtained in step S3 into 3 ml of sulfuric acid solution with 0.02 g of polyaspartic acid added, and add 6 ml of deionized water, and ultrasonically disperse for 1 hour to obtain graphene...

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Abstract

The invention discloses a preparation method of a lead graphene battery negative electrode plate. The preparation method is characterized by comprising the following steps: S1: carrying out graphene oxide modification, heating polar nitrogen containing organic solvent to 50-80 DEGC, adding graphene oxide, continuously stirring for 3-5h, and separating and drying to obtain modified graphene oxide; S2: dispersing the modified graphene oxide into a metal salt solution; S3: transferring the solution obtained in the S2 into a hydrothermal kettle, carrying out hydrothermal reaction for 3-8 hours at the temperature of 150-170DEG C, and obtaining the composite material of reduced graphene metal oxide; S4: dispersing the composite material into a sulfuric acid solution to obtain graphene sulfuric acid dispersion liquid; S5: mixing lead powder, barium sulfate, lignin, fibers and the graphene sulfuric acid dispersion liquid into paste, drying and solidifying to obtain the lead graphene battery negative electrode plate. Through the S1, a graphene surface is subjected to functionalization in advance, then, the graphene and the metal oxide are compounded, and the obtained composite material can fully perform the function in batteries.

Description

technical field [0001] The invention relates to a chemical power source, in particular to a method for preparing a lead graphene battery negative plate. Background technique [0002] The increasingly serious environmental problems have drawn people's attention to electric transportation, and batteries, as the core components of electric transportation, have a great relationship. As a kind of traditional battery, lead-acid battery has stable performance and low price. However, it has limited energy density and poor cycle life. [0003] The concept of adding carbon materials to lead-acid batteries to build lead-carbon batteries has brought new hopes and breakthroughs to lead-acid batteries. Lead-carbon batteries can increase the life of lead-acid batteries and improve material properties. Studies have shown that lead-carbon batteries have indeed played a significant role in improving the fast charging ability of traditional lead-acid batteries and the cycle life of high-rat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/16
CPCH01M4/16Y02E60/10
Inventor 赵瑞瑞陈红雨梁家星
Owner SOUTH CHINA NORMAL UNIVERSITY
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