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Graphene coated lead composite material and preparation method thereof as well as lead-acid battery

A technology of graphene coating and composite materials, which is applied in the direction of lead-acid batteries, battery electrodes, circuits, etc., can solve the problems of weak conductance and capacitance, poor combination of carbon and lead, etc., to achieve good capacitance advantages and improve Conversion efficiency and the effect of improving electrical conductivity

Active Publication Date: 2014-07-30
HENGYANG RITAR POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a graphene-coated lead composite material and its preparation method, to solve the problem of poor carbon and lead bonding in the existing lead-carbon composite material, electrical conductivity and The technical problem that the advantage of capacitance is not strong

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  • Graphene coated lead composite material and preparation method thereof as well as lead-acid battery
  • Graphene coated lead composite material and preparation method thereof as well as lead-acid battery

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preparation example Construction

[0023] Correspondingly, the present invention also provides a preparation method of the above-mentioned composite material. This preparation method comprises the steps:

[0024] S01. prepare the precursor mixture material of graphene-coated lead composite material: according to the ratio of lead particle, graphene, carbonate, stannous sulfate in the above-mentioned graphene-coated lead composite material, lead particle, graphene, carbon salt, stannous sulfate, dispersant, and hydroxyl-containing alcohol compounds are added to water for mixing treatment to obtain a mixed material;

[0025] S02. Subjecting the mixed material to solvothermal reaction treatment: the mixed material prepared in step S01 is subjected to solvothermal reaction at 90-100° C., and after the reaction is completed, solid-liquid separation treatment is performed, and the separated solid is washed to obtain The graphene-coated lead composite material.

[0026] Specifically, in the step of preparing the mix...

Embodiment 1

[0040] A graphene-coated lead composite material and a preparation method thereof. The graphene-coated lead composite material includes lead particles and a graphene layer coated on the surface of the lead particles, and lead carbonate and stannous sulfate are also doped in the graphene layer, and the lead particles, lead carbonate, and sulphate The mass ratio of tin to graphene in the graphene layer is 30:2:0.05:2. The particle diameter is 1-25 μm.

[0041] The preparation method of the graphene-coated lead composite material comprises the following steps:

[0042] Add lead powder and graphene to ethylene glycol after ball milling, then add lead carbonate, stannous sulfate, polyacrylamide and water, and put it in a closed reaction kettle at 95±5℃. Solvothermal reaction was carried out for 25 hours; the precipitate was separated; the obtained precipitate was washed with ethanol and dried to obtain powdery porous graphene-coated lead particles. Among them, the total mass of ...

Embodiment 2

[0044] A graphene-coated lead composite material and a preparation method thereof. The graphene-coated lead composite material includes lead particles and a graphene layer coated on the surface of the lead particles, in which the graphene layer is also doped with sodium carbonate and stannous sulfate, and the lead particles, sodium carbonate, and sulfurous acid The mass ratio of tin to graphene in the graphene layer is 60:4:0.03:2. The particle diameter is 10 μm.

[0045] The preparation method of the graphene-coated lead composite material comprises the following steps:

[0046] Add lead powder and graphene to ethanol after ball milling, then add sodium carbonate, stannous sulfate, polyacrylic acid and water, and put it in a closed reaction kettle, and carry out solvothermal reaction at 95±5°C 20 hours; the precipitate was separated; the obtained precipitate was washed with ethanol and dried to obtain powdery porous graphene-coated lead particles. Among them, the total mas...

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Abstract

The invention discloses a graphene coated lead composite material and a preparation method thereof as well as a lead-acid battery. The graphene coated lead composite material comprises lead particles and a graphene layer covering the lead particles; the graphene layer is further doped with carbonate and stannous sulfate, and the mass ratio of carbonate to stannous sulfate to graphene in the graphene layer is (1-4):(0.01-0.06):1. The preparation method of the graphene coated lead composite material comprises the steps of preparing a precursor mixture of the graphene coated lead composite material and performing solvothermal reaction treatment on the mixture. The anode and the cathode of the lead-acid battery contain the graphene coated lead composite material. The graphene coated lead composite material is high in structural stability, electrical conductivity and capacitive performance; the preparation method of the graphene coated lead composite material is capable of guaranteeing even size distribution, and also is high in operability and environmentally friendly, and consequently, enlarged production can be realized. The lead-acid battery is excellent in specific capacity, charge-discharge performance and charge-discharge cycle performance, and long in service life.

Description

technical field [0001] The invention belongs to the technical field of lead-acid batteries, and in particular relates to a graphene-coated lead composite material, a preparation method thereof, and a lead-acid battery. Background technique [0002] After more than 100 years of development, lead-acid batteries have the advantages of mature technology, good safety performance, low cost, stable performance and high resource regeneration recovery rate, and have made great contributions in many applications. With the development of the electric vehicle industry, there are greater requirements for battery charge and discharge performance and cycle life. However, the power density of lead-acid batteries is not high. , the negative electrode is prone to irreversible "sulfation", resulting in its cycle life much lower than its potential life. Therefore, it is necessary to modify the lead-acid battery to improve its power density, charge and discharge performance and cycle performanc...

Claims

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Application Information

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IPC IPC(8): H01M4/57H01M4/62H01M10/06
CPCH01M4/366H01M4/56H01M4/625H01M10/06Y02E60/10
Inventor 刘兆勇夏朝阳
Owner HENGYANG RITAR POWER CO LTD
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