Uitbreidbare grafietontdekking en -ontwikkeling

(Uitbreidbare grafietontdekking en -ontwikkeling)

Discovery and Development

Expandable graphite was first discovered by Schaufautl, een Duitser. In 1841, Schaufautl soaked natural graphite in a mixture of concentrated HNO3 and concentrated H2SO4. After several hours, Schaufautl took it out and dried it.

Union Carbide first patented expandable graphite manufacturing technology in 1963 and began industrial production in 1968.

Common preparation methods

The initial raw material for the preparation of the chemical intercalation method is high carbon flake graphite, and the other chemical reagents such as concentrated sulfuric acid (above 98%), waterstofperoxide (above 28%), potassium permanganate, enz., are industrial grade reagents. The general steps of preparation are as follows: at the appropriate temperature, different proportions of hydrogen peroxide solution, natural flake graphite, and concentrated sulfuric acid are added in different procedures, and reacted for a certain time under constant agitation, then washed to neutral, centrifugal separation, dehydration, and vacuum drying at 60 ℃.

Electrochemical method: Graphite powder is processed in a strong acid electrolyte to make expandable graphite, hydrolyzed, cleaned, and dried.As a strong acid, mainly sulfuric or nitric acid is used. The expandable graphite obtained by this method has a low sulfur content.

In the process of preparing expandable graphite by ultrasonic oxidation, ultrasonic vibration is carried out on the anodizing electrolyte, and the ultrasonic vibration time is the same as that of anodizing. Because the vibration of ultrasonic electrolytes is beneficial to the polarization of anode and cathode, the speed of anodic oxidation is accelerated and the oxidation time is shortened.

The graphite and intercalator are respectively sent to both ends of a vacuum-sealed tube by the gas phase diffusion method. The intercalator is heated at the end of the intercalator, and the temperature difference between the two ends is used to form the necessary reaction pressure difference so that the intercalator enters between the flake graphite layers in a state of small molecules, thus the expandable graphite is prepared. The number of layers of expandable graphite produced by this method can be controlled, but the production cost is high.

Melt salt method to mix several inserts with graphite and heat them to form expandable graphite.

Expandable graphite Supplier

Gember Maan & Ster New Energy Technology Co., LTD, opgericht in oktober 17, 2008, is een hightech onderneming die zich inzet voor onderzoek en ontwikkeling, productie, verwerking, sales, en technische diensten van anodematerialen voor lithium-ionbatterijen.

Na meer dan 10 jaren van ontwikkeling, het bedrijf heeft zich geleidelijk ontwikkeld tot een gediversifieerde productstructuur met natuurlijk grafiet, kunstmatig grafiet, samengesteld grafiet, tussenfase, en andere negatieve materialen (silicium-koolstof materialen, enz.).

The products are widely used in high-end lithium-ion digital, power, and energy storage batteries. Feel free to contact us if you need graphite we will reply to you within 24 uur：sales@graphite-corp.com

 

(Uitbreidbare grafietontdekking en -ontwikkeling)