Nano-graphite sol and preparation method thereof and nano-graphite and preparation method thereof

A technology of nano-graphite and sol, which is applied in the field of nano-graphite, can solve problems affecting the performance of nano-graphite, and achieve the effect of unstable performance and rapid separation

Active Publication Date: 2016-12-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Equally, although adopting this method to separate and obtain nano-graphite carbon powder, it also introduces a large amount of impurities on the nano-graphite carbon powder, thereby affecting the performance of nano-graphite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] Since the nano-graphite sol used in the method for preparing nano-graphite of the present invention is the nano-graphite sol prepared according to the method of the present invention (using volatile water-soluble substances as the main electrolyte of the present invention), it only needs to undergo decompression The evacuation operation makes the volatile electrolyte volatilize in large quantities (thereby destroying the charge balance on the surface of nano-graphite), and then filters and dries to obtain nano-graphite.

[0030] And because the method of the present invention does not need to additionally add wrapping agent, alkali metal salt etc. to carry out the separation of nano-graphite sol, make the method of the present invention compare the method for preparing nano-graphite by wrapping nano-graphite sol in the prior art, and adding alkali metal The methods for preparing nano-graphite, such as the salt-destroying electric double-layer equilibrium separation metho...

Embodiment 1

[0038] Preparation of nano-graphite sol: 283.93g of ammonia water (concentration: 28% by weight) and 0.024g of polyvinylpyrrolidone PVP (purchased from Chengdu Gracia Chemical Technology Co., Ltd., brand PVPK30) were added to 2795.57g of deionized water and mixed evenly to obtain an electrolyte. Pour the electrolyte solution into the electrolytic cell, use the graphite electrode as the anode and the stainless steel electrode as the cathode, then put the electrolytic cell into a closed space, heat the electrolyte in the electrolytic cell at 50°C for 1 hour, and then turn on the power Carry out electrolysis, stop electrolysis when detecting that the concentration of nano-graphite sol is 2.6% by weight, obtain nano-graphite sol NGS-1, there is no precipitated nano-graphite in the nano-graphite sol (and take out its part as sample, under airtight condition, After the sample was placed for 30 days, there was basically no precipitation or stratification);

[0039] Preparation of nan...

Embodiment 2

[0041] Preparation of nano-graphite sol: Add 40.5g urea and 0.018g sodium lauryl sulfate (purchased from Guangdong Guanghua Chemical Factory Co., Ltd.) into 3000g deionized water and mix evenly to obtain an electrolyte, pour the electrolyte into the electrolytic cell, Use the graphite electrode as the anode and the graphite electrode as the cathode, then put the electrolytic cell into a closed space, heat the electrolyte in the electrolytic cell at 90°C for 1 hour, and then turn on the power for electrolysis, when the nano-graphite sol is detected When the concentration is 0.96% by weight, the electrolysis is stopped to obtain the nano-graphite sol NGS-2, and there is no precipitated nano-graphite in the nano-graphite sol (and take out its part as a sample, under airtight conditions, after the sample is placed for 30 days, there is basically no precipitation. , layering phenomenon);

[0042] Preparation of nano-graphite: Then use a vacuum pump to vacuumize the above-mentioned ...

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Abstract

The invention provides a nano-graphite sol and a preparation method thereof. The method includes: under an airtight condition, and under the electrolytic conditions of electrolyzing a graphite electrode into nano-graphite, in an electrolyte solution containing volatile component and a water-soluble surfactant, electrolyzing a graphite electrode serving as the anode to obtain the nano-graphite sol. Specifically, the volatile component is an easily volatile water-soluble substance and / or a substance able to generate an easily volatile water-soluble substance under heating. The invention also provides a nano-graphite and its preparation method. The nano-graphite sol prepared according to the method provided by the invention has good stability, and the preparation method of the nano-graphite provided by the invention has the advantages of simple steps, easy implementation, and no need for introduction of impurity elements.

Description

technical field [0001] The present invention relates to a method for preparing nano-graphite sol, and the nano-graphite sol prepared according to the method for preparing nano-graphite sol of the present invention, and a method for preparing nano-graphite, and the method for preparing nano-graphite according to the present invention. obtained nanographite. Background technique [0002] Nano-graphite has a wide range of uses, such as new fertilizers, battery electrode materials, electric heating materials, magnetic recording materials, etc. However, when the graphite is nanoscale, its specific surface energy is very large, and it tends to agglomerate to reduce the specific surface energy, so it is very easy to agglomerate and difficult to disperse, thus making the preparation and separation of highly dispersible nano-graphite very difficult. difficulty. [0003] At present, nano-graphite with high dispersion is mainly prepared by two basic methods: one method is to form an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00C01B31/04C01B32/21
Inventor 陈小芳苗伟峰
Owner BYD CO LTD
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