Modification of Natural Graphite and Artificial Graphite

A graphite-powder is separated into two types based on its processing technology and raw materials. Graphite is a great anode material in lithium ion cells because it offers low lithium potential and good cycle stability.

Natural graphite

The majority of natural graphite is made from natural flake graphite and then modified to form spherical, natural graphite. Although natural graphite are widely popular, they have several drawbacks.
The graphite natural has numerous surface defects and a large specific area. It also exhibits low first efficiency.
PC-based battery electrolyte can result in serious phenomena such as solvated liion coembedding. It causes graphite to grow and then peel off, leading to poor performance.

Natural graphite displays strong anisotropy. However, lithium can only be embedded on the face. Rate performance is also poor. Artificial graphite typically contains dense petroleum coal or needle coke for its precursors. Although this eliminates most of the flaws of natural graphite’s surface, there are still problems such as poor magnification, low performance at low temperatures, easy separation of lithium and so forth.

Modifications of natural graphite

Different surfactants have been used to treat the surface problems in natural graphite as well as poor electrolyte tolerance.

It is possible to first alter the pore surface, increase micropores, and the lithium intercalation path along graphite’s graphite surface. The second method involves high temperature oxygen-free atmosphere (HTO) sintering.

Second, you can use strong oxide solutions as oxidation treatments to passivate and reduce the active surface potential.

Another method involves fluorinating the graphite with ClF3. You can see that both the charge-discharge ratio and the life span of graphite have been significantly increased.

To create core-shell particles, another treatment option is to coat the carbon of natural graphite with an amorphous coating. Most commonly, the source of carbon in amorphous material is pitch,phenolic resin or low temperature pyrolyticcarbon materials. A carbon layer allows you to reduce interfacial impedance due to large gaps between carbon layers. It can improve the intercalation as well as diffusion capability of lithium.
A mechanical process is sometimes used to solve the problem caused by strong anisotropy. This involves making the natural graphite particles rub together and cutting off the edges. This process is non-doping and produces high spheroidizing effectiveness. But it may result in the pulverization large numbers of particles, with low yield.

Mechanical fusion uses the material to move at high velocity in the Rotor. This causes the material to adhere to the walls under centrifugal pressure and pass through between stator extrusion and rotor. The material is then subjected both to extrusion and shear forces. In order to achieve the aim of spheroidization the surface will undergo mechanical melting because of the frictional effects between particles and their equipment.

Spheroidization results in natural graphite having a particle size between 15 and 20 m. These factors make it more efficient and better for the second efficiency, as well the performance at magnification.

Modifications of artificial graphite

Modification of synthetic graphite: Artificial graphite’s modification mode is distinct from natural graphite. You can usually reduce the number of graphite particles in a given position by reorganizing their particle structures. Most commonly, the diameter of the needle coke precursor (with a diameter of between 8-10 millimeters) is used. Carbon sources for binder are usually easily graphitized materials, such as asphalt. After several particles of needle coke are treated with drum furnace, secondary particles with sizes between 14 and 18 mm can then be graphitized to decrease the Oi.

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