High Level Alloy Silicon Metal

Composite articles of silicon carbide whiskers and/or fiber reinforced microcrystalline glass matrix, wherein alkaline earth silicon metal and aluminates constitute the dominant crystalline phase. Further, the composite article primarily comprises 10-60% by weight of silicon carbide whiskers and/or 15-70% by volume of ceramic fibers, while the microcrystalline glass matrix mainly consists of calcium oxide, strontium oxide, aluminum oxide, silicon oxide, barium oxide, magnesium oxide, sodium oxide, potassium oxide, titanium oxide, zirconium oxide, and arsenic oxide, with the best dominant phase selected from: feldspar and its pseudo-binary system with mullite, cordierite, barianite, and sodium feldspar solid solution.

1.Silicon Metal is an impure silicon powder that contains metal elements (such as iron, aluminum, calcium, etc.) after the reduction reaction of silicon ore. The silicon content in metallic silicon powder ranges from 60% to 99.9%, and its price is much lower than that of pure silicon powder. Using inexpensive metallic silicon as the negative electrode material for lithium-ion batteries shows that for different amounts of conductive additives, the first discharge and charge specific capacity of metallic silicon is higher than that of pure silicon; the irreversible capacity in the first cycle of metallic silicon accounts for 70%, while for pure silicon it is 85%, and its cycling performance is improved by more than double compared to pure silicon; the smaller the charge and discharge current density, the slower the capacity decay of metallic silicon; as the number of cycles increases, the capacities corresponding to different charge and discharge currents gradually approach the same value; the lithium storage mechanism of metallic silicon is similar to that of pure silicon, as metallic silicon continuously forms irreversible phases Li13Si4 and Li12Si7 during the charge and discharge cycles, and the presence of these irreversible phases consumes Si in the material, leading to capacity decay. As the charge and discharge continue, crystalline Si gradually becomes amorphous.

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