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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, performance, and cost.
Classification of Graphite and its Characteristics
The formation of graphite powder occurs when organic carbon is transformed by a long-term geological environment with high temperatures and high pressure. It is nature’s crystallization. The crystal form of graphite determines the process characteristics. 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. All graphite materials that are obtained through high-temperature graphitization and organic carbonization can be called artificial graphite. These include carbon (graphite), carbon fiber, foam graphite etc. In the narrowest sense, the term artificial graphite refers to raw carbonaceous materials (petroleum, pitch, etc.). With low impurity contents as aggregates, coal pitches, etc. After batching, kneading molding and carbonization (industrially referred to as a block-solid material obtained through baking) and graphitization. Examples include graphite electrode, hot isostatic pressed graphite and others. We will now learn more about the artificial graphite production process and its use.
Artificial Graphite: Production and Application Process
Anode materials are one of the key components of lithium-ion battery, and they play a major role in terms of energy density and cycling 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, tungstenbased, etc. but their large quantity is limited due to a variety problems. At present, graphite carbon materials dominate the market for anode materials.
Artificial graphite is less crystallin and has a disordered structure compared to natural graphite. It also has a smaller interlayer spacing. Artificial graphite also has a surface that is not smooth and porous. It also has a high specific surface. It decomposes and reacts easily with the electrodelyte. Therefore, its initial efficiency (=350mAh/g), and specific capacity are low.
In order to improve the artificial graphite production process, researchers improved it. 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 artificial graphite. The overlapping layer prevents the co-embedding and expansion of graphite. 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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