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Method for preparing graphene/lead compound composite material

A lead compound and composite material technology, applied in electrical components, battery electrodes, nanotechnology, etc., can solve the problem that lead active materials and carbon materials have less effective contact interface, can not give full play to the advantages of high conductivity and large capacitance of carbon, and are very uniform in mixing. Difficult to achieve and other problems, to achieve the effect of improving the effective contact area, good capacitance and battery performance, and prolonging life

Active Publication Date: 2015-05-20
湖北雄韬电源科技有限公司
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Problems solved by technology

[0014] 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 higher 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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  • Method for preparing graphene/lead compound composite material
  • Method for preparing graphene/lead compound composite material
  • Method for preparing graphene/lead compound composite material

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Experimental program
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Effect test

Embodiment 1

[0037] The preparation method shown in this embodiment mainly comprises the following steps (please refer to figure 1 ):

[0038] (1) Hammers (hummers) method to prepare graphene oxide

[0039] 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% H2 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 prepared ac...

Embodiment 2

[0050] The preparation method shown in this embodiment mainly comprises the following steps (please refer to figure 2 ):

[0051] (1) Improved Hammers (hummers) method for preparing graphene oxide

[0052] 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 for...

Embodiment 3

[0061] The preparation method shown in this embodiment mainly comprises the following steps:

[0062] Steps (1) and (3) in this embodiment are the same as steps (1) and (3) in Embodiment 1 or Embodiment 2 above. Step (2) in this embodiment is the same as step (2) in Embodiment 1.

[0063] The difference is step (4), namely:

[0064] (4) Preparation of graphene / lead compound composites by reduction with reducing agent and deionized water

[0065] Take a certain amount of graphene oxide / lead compound composite material and add it to an aqueous solution containing 2g of glucose as a reducing agent, add 2ml of ammonia water dropwise, stir at 90°C for 2h, filter with suction, wash until neutral, dry and grind to obtain light black graphene / lead compound composites. The reducing agent can be at least one of hydrazine hydrate, sodium borohydride, glucose, sodium citrate, ethylenediamine, ascorbic acid, hydroiodic acid, and L-cysteine ​​as required. The feeding mass ratio of reduc...

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Abstract

The invention discloses a method for preparing a graphene / lead compound composite material for producing batteries. The method comprises the following steps: firstly, performing hydrothermal reaction on a lead compound and graphene oxide, and mixing or performing ball-milling mixing, thereby obtaining a graphene oxide / lead compound composite material; and secondly, reducing the prepared graphene oxide / lead compound composite material, thereby preparing the graphene / lead compound composite material. When the graphene / lead compound composite material prepared by using the method is used, not only is agglomeration of graphene avoided, but also uniform dispersion of graphene and the lead compound is achieved, and the graphene and the lead compound can be uniformly mixed; when the graphene / lead compound composite material is used as a high-efficiency additive of a lead-acid cell, the charge accepting capability of the battery can be remarkably improved, and the HRPSoC cycle life of the battery can be prolonged.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a method for preparing a graphene / lead compound nanocomposite material used for battery production. 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] Graphene is a new type of two-dimensional structure conductive material. The application of graphene has great significance and great development potential in this field. [0004] Since Novoselov and Geim exfoliated single-layer graphene from the surface of high-temperature orderly cracked graphite by a simple tape stripping method in 2004, graphene has attracted attention because of its unique single-atom layer structure and rich and peculiar physical...

Claims

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Application Information

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IPC IPC(8): H01M4/38B82Y40/00C01B31/04
CPCY02E60/10
Inventor 高鹏然张农华彭斌
Owner 湖北雄韬电源科技有限公司
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