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Graphite Graphite can be classified into artificial graphite Graphite or natural graphite. Although both graphite powders have similar properties in terms of physical and chemical structure, their applications are very different. Some researchers have not noticed the differences between the two, and called it graphite as a whole in several studies. This conflation has resulted in many errors of judgment and decision-making, which have led to a waste of resources and financial losses. This article discusses the difference between natural and synthetic graphite in terms of their structure, composition and performance.
Classification and Characteristics Of Graphite POWDER
Natural graphite is produced by the transformation carbon-rich organic material under long-term geological conditions of high temperatures and high pressure. It is nature’s crystallization. Natural graphite is characterized by its crystal form. Minerals with different crystallographic forms have different industrial value and uses. There are several types of graphite powder. The industry divides graphite according to its crystalline form. My country has two main categories: flake graphite, and cryptocrystalline.
Crystallography uses polycrystals to describe the structure of graphite. Artificial graphite comes in many different forms, each with a unique production process. Graphite obtained from organic carbonization, graphitization, and high temperature treatment is collectively known as artificial graphite. Examples include carbon (graphite), carbon fiber, pyrolytic graphite (graphite), etc. In a narrower sense, the term artificial graphite refers to materials that are carbonaceous (petroleum, pitch, etc.). With low impurity contents as aggregates, coal pitches, etc. After batching, kneading molding and carbonization (industrially referred to as It is a block-solid material obtained through baking), and graphitization. Examples include graphite electrode, hot isostatic pressed graphite and others. Today, we will look at the uses and production processes of artificial graphite.
Artificial Graphite and its Production Process
Anode materials are one of the key components of lithium-ion battery, and they play a major role in energy efficiency and cycle stability. The development of science has led to the emergence of new negative electrodes materials. These materials include graphene and carbon nanotubes. They also come in silicon-based, tinbased, and tungstenbased. But, due to a variety problems, they are only available in limited quantities. At present, graphite carbon materials dominate the market for anode materials.
Artificial graphite is less crystallin and has less graphitization than natural graphite. It also has some disordered structure. Artificial graphite also has a surface that is porous, not smooth and large in specific area. The surface of artificial graphite is porous and easy to decompose. This results in a low initial efficiency (=350mAh/g).
Researchers improved the production method to overcome the problem of artificial graphite, which is used in lithium-ion batteries. A modified artificial graphite product with low expansion and high compaction is a good example. Using it as a negative electrode for a replacement lithium battery will improve its conversion to electrolyte and reduce swelling in the pole shoe. The process of production is to replace the artificial graphite by pitch, etc. The carbonization process is to replace the artificial graphite with pitch, etc. A layer of amorphous, carbon-doped material is formed over the surface. The overlapping layer prevents the co-embedding and expansion of organic solvents. The surface layer has been displaced so that the lithium batteries are interrupted. This maintains high capacity and low potential, as well as compatibility with a wide range of solvents.
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