A DEVICE FOR MANUFACTURING RAPIDLY SOLIDIFIED POWDER ALLOY INCLUDING SI PRECIPITATES OF ACTIVE MATERIAL FOR RECHARGABLE LI-BATTERY AND A METHOD THEREOF

摘要

Provided are an apparatus and a method for manufacturing rapidly solidified silicon based alloy powder that is used as a negative active material of a secondary lithium battery and has a fine grain structure where average grain size of silicon phase at 100 nm or lower in a matrix phase is uniformly dispersed and precipitated. The apparatus includes: a high speed ejection module which melts alloy powder including silicon and ejects the melted material at a high speed; a rotator which rotates relative to the high speed ejection module so as to quickly cool down the melted material ejected from the high speed ejection module by colliding the melted material with the rotator; and a chamber which includes the rotator and blocks airflow from the outside so as to prevent oxidation of particles of the alloy powder that collide with the rotator and scatter. The method includes: a high speed ejection operation which melts alloy powder including silicon and then ejects the melted material at a high speed; a cooling operation which quickly cools down the ejected melted material inside a chamber in which airflow with the air is blocked, by colliding the melted material with a rotator that rotates at a high speed.