Preparation method for graphene/lead compound composite material and lead-acid battery

A technology of lead compounds and composite materials, applied in the direction of lead-acid batteries, battery electrodes, circuits, etc., can solve the problem that the effective contact interface between lead active material and carbon material is small, the advantages of high conductivity and large capacitance of carbon cannot be fully utilized, and the uniform mixing is very difficult. Difficult to realize and other problems, to achieve the effect of suppressing large particles of lead sulfate, increasing the effective contact area, good capacitance and battery performance

Active Publication Date: 2016-03-23
湖北雄韬电源科技有限公司
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Problems solved by technology

[0005] However, in the existing technical solutions, the carbon material of the lead-carbon super battery is mainly mixed mechanically with the lead powder. Since the density of the lead powder is much greater than that of the carbon material, it is difficult to achieve uniform mixing of the two, and through In the way of mechanical mixing, the effective contact interface between the lead active material and the carbon material is less, and the advantages of high electrical conductivity and large capacitance of the carbon cannot be fully utilized. In the process of dry mixing the graphene solid with the lead negative electrode material, it is easy to cause the agglomeration of graphene , and it is not easy to mix evenly, which will affect the advantages of graphene

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  • Preparation method for graphene/lead compound composite material and lead-acid battery
  • Preparation method for graphene/lead compound composite material and lead-acid battery
  • Preparation method for graphene/lead compound composite material and lead-acid battery

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preparation example Construction

[0029] Specifically, the invention provides a kind of preparation method of graphene / lead compound composite material, it comprises the steps:

[0030] S1. Perform hydrothermal reaction mixing or ball milling of the lead compound and graphene oxide to obtain a graphene oxide / lead compound composite material;

[0031] S2, using the graphene oxide / lead compound composite material as an electrode material additive to assemble a lead-acid battery;

[0032] S3. Perform electrochemical reduction on the lead-acid battery prepared and assembled in step S2 to obtain a lead-acid battery containing graphene / lead compound composite material.

[0033] Among them, graphene is a new type of two-dimensional structure conductive material, and the application of graphene has great significance and great development potential in this field.

[0034] Since Novoselov and Geim exfoliated single-layer graphene from the surface of high-temperature orderly cracked graphite by a simple tape stripping ...

Embodiment 1

[0060] The technological process of this embodiment is as figure 1 As shown, it specifically includes the following steps.

[0061] (1) Hammers (hummers) method to prepare graphene oxide

[0062] Concentrated H 2 SO 4 (69 ml) was added graphite flakes (3.0 g, 1 wt. equivalent) and NaNO 3 (1.5 g, 0.5 wt equiv), the resulting mixture was cooled to 0°C. Slowly add KMnO in batches 4 (9.0 g, 3 wt equiv), the reaction temperature was kept below 20°C. The reaction mixture was warmed to 35°C and stirred for 30 minutes, at which point water (138 mL) was added slowly, with a large exotherm to 98°C. External heating was introduced to maintain the reaction temperature at 98°C for 15 minutes, then the reaction mixture was cooled with a water bath for 10 minutes. Then add more water (420 ml) and 30% H 2 o 2 (3 mL), exotherm again. After air cooling, 1.2 g of the obtained black solid mixture was purified, which was graphene oxide. Different weights of graphene oxide can be prepare...

Embodiment 2

[0073] The technological process of this embodiment is as figure 2 As shown, it specifically includes the following steps.

[0074] (1) Improved Hammers (hummers) method for preparing graphene oxide

[0075]With 325 mesh graphite as the initial raw material, 7.2mL of 98% concentrated sulfuric acid, 1.5g of potassium thiosulfate and 1.5g of phosphorus pentoxide were added to 0.9g of graphite powder. Then the mixture was stirred and reacted at 80° C. for 4.5 h, and then the reactant was diluted with about 500 mL of distilled water, filtered, and the filter cake was dried overnight in a 70° C. blast oven. Put the above-mentioned treated graphite powder into a 250mL beaker, slowly add 23mL of concentrated sulfuric acid and 0.5g of sodium nitrate under an ice-water bath, stir for five minutes, then slowly add 3g of potassium permanganate to it, and stir in an ice-water bath for 30 Minutes, and then slowly warmed to 35 ° C, maintaining the temperature and stirring the reaction fo...

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Abstract

The invention provides a preparation method for a graphene / lead compound composite material. A production method for a lead-acid battery comprises: firstly, performing hydrothermal reaction mixing or ball-milling mixing on a lead compound and graphene oxide to obtain a graphene oxide / lead compound composite material; secondly, assembling the lead-acid battery by taking the graphene oxide / lead compound composite material as an electrode material additive; and thirdly, performing electrochemical reduction on the lead-acid battery to obtain the lead-acid battery containing the graphene / lead compound composite material. The lead-acid battery produced with the method contains the graphene / lead compound composite material, so that the agglomeration of the graphene is avoided, uniform dispersion of the graphene and the lead compound is realized, and the graphene and the lead compound can be uniformly mixed; and moreover, a graphene / lead compound superbattery is easily obtained through the electrochemical reduction, so that the charge acceptance capability of the battery is remarkably improved and the cyclic life of the battery is remarkably prolonged.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a preparation method for graphene / lead compound composite materials and a lead-acid battery. Background technique [0002] The development of clean and renewable energy is a major strategy for my country's social and economic development. In all levels of new energy technology, electrochemical energy storage plays an extremely important role, and it is also a hot issue in current scientific research. [0003] At present, the lead-carbon super battery is one of the composite power sources that integrate lead-acid batteries and supercapacitors. It is made by adding a certain amount of carbon materials with high specific capacitance (usually carbon materials plus In the negative plate), the added carbon material can store or release a large amount of charge in an instant, and play a role in buffering the negative plate to a certain extent. Therefore, the lead-carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/57H01M10/06
CPCH01M4/366H01M4/57H01M4/625H01M4/628H01M10/06Y02E60/10
Inventor 高鹏然张华农
Owner 湖北雄韬电源科技有限公司
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