Crushing and classifying device and method for crushing and classifying electrode material

A method for crushing and classifying an electrode material of a secondary battery using a crushing and classifying device including a crushing chamber into which an object to be processed is introduced, a rotating shaft that is disposed in the crushing chamber and that rotates by receiving a driving force, a striking body of which one end is rotatably connected to the rotating shaft and that rotates in the crushing chamber by receiving a centrifugal force accompanying rotating of the rotating shaft, the striking body having a rod shape or a chain shape and including an edge portion having a radius of curvature rounded to 1 mm or more and 9 mm or less at least at a distal end of the striking body, and a screen that is provided on a wall surface of the crushing chamber and that classifies the crushed object to be processed, the screen having an opening that is equal to or less than 5 mm, the method comprising:

• a step of introducing the electrode material into the crushing chamber;
• a step of crushing the electrode material by rotating the striking body for a predetermined time;
• a step of sieving the crushed electrode material on the screen;
• and
• a step of separately collecting powder sieved from the crushed electrode material and a residue in the crushing chamber.