High Level Material Silicon Metal 1502

Silicon metal 1502 is an impure silicon powder containing metal elements (iron, aluminum, calcium, etc.) after the reduction reaction of silicon ore, and the silicon content in silicon metal powder is 60%~99.9%, and the price is much lower than that of pure silicon powder. Using cheap silicon metal as the anode material for lithium-ion batteries.

1.For different conductive agent additions, the first discharge and charging specific capacity of silicon metal 1502 are higher than those of pure silicon. The irreversible capacity of silicon metal accounts for 70% for the first time, and the recycling capacity of pure silicon is 85%, and its cycle performance is more than double that of pure silicon. The smaller the charge-discharge current density, the slower the capacity decay of silicon metal. With the increase of the number of cycles, the capacity corresponding to different charge and discharge currents gradually approached the same. The lithium storage mechanism of silicon metal and pure silicon is similar, and irreversible Li13Si4 and Li12Si7 are continuously formed by silicon metal during the charge-discharge cycle, and the existence of these irreversible phases consumes the Si in the material, resulting in capacity decay. With the progress of charge and discharge, the crystalline Si gradually amorphizes.

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