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Natural graphite is separated from artificial graphite. Graphite is an ideal anode for lithium-ion batteries because of its low lithium cost and high efficiency.
Analyse of natural graphite
Natural flake graphite can be used to make natural graphite. It is then modified to produce spherical natural Graphite. Although natural graphite has many advantages, there are some drawbacks to it.
Natural graphite exhibits many defects on the surface, large surface areas and low efficiency.
PC-based electrolyte can cause serious problems such as solvated lithium Ion co-embedding. This leads to graphite peeling and expansion, and ultimately, battery failure.
The anisotropy of natural graphite means that lithium ion is difficult to embed from the end faces. It also makes it easy for lithium ions to be precipitated. But artificial graphite can be made from dense petroleum coke (or needle coke) as precursors. It avoids some of the defects found in natural graphite’s surface, however, it still has problems such as poor magnification and low temperatures performance. Also, it is easy to separate lithium.
Modifications to natural graphite
Different surfactants were applied to the graphite to fix its surface imperfections and toler electrolyte well.
To improve magnification of natural graphite, the first step is to modify the pore structure. After etching with strong alkali (KOH), the solution in an aqueous solution has been applied to the graphite.
You can also use strong oxidant solution to passivate surface active potential. This will increase natural graphite’s efficiency.
Third, fluorinate natural graphite by using ClF3. Effectively, the cycle life and charge/discharge ratio are improved.
The amorphous graphite can also be coated to form “coreshell” structures. The carbon source for amorphous Carbon is typically pitch, phenolic or other low temperature pyrolytic material. Because of the long distance between carbon layers, the presence of a carbon coating can reduce interfacial impedance and isolate electrolyte from the particles. Enhance the intercalation or diffusion of lithiumion.
To solve the anisotropy problem in natural graphite, mechanical treatments are often employed to shape the particles. An air flow shaping device uses wind to create a rub between the particles and to cut their corners. The method doesn’t introduce any doping impurities. However, this will cause the pulverization to produce large quantities of particles at low yield.
Mechanical fusion machines use the material to spin at high speed inside the rotor. The material clings on to the wall using centrifugal force and then passes between the stator extrusionhead and the rotor at high velocity. This is when the material will be subject to extrusion force and shear pressure. To achieve the goal of spheroidization, the surface is subject to the friction between particles and other particles.
Natural graphite’s particle sizes are reduced to 15-20 mm after the spheroidization process. The first efficiency and performance of the cycles is clearly improved. Magnification performances can also be greatly enhanced.
Modifications to Artificial Graphite
Modifications of artificial graphite. The modification process of artificial graphite has a different structure than that of natural graphite. The organization of particles can reduce graphite’s OI value (position degree) generally. A needle coke precursor of 8-10mm in diameter is chosen. The carbon source for the binder is typically made from easily graphitized materials like asphalt. A number of needle coke particles can be bonded using drum furnace treatment. The secondary particles, with a size of 14-18mm, are then made into graphitization. This will help to reduce the Oi.
Graphite Powder Pricing
Price is affected by many things, such as the demand and supply in the market and industry trends. Economic activity and market sentiment are also important.
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Graphite Pulver Supplier
Technology Co. Ltd. has over 12 years of experience as a reliable natural graphite supplier and manufacturer. All of our products can be shipped worldwide.
You can find high-quality, natural flake graphite powder here.
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