Patent ID: 7563543
Filing Date: 2009-07-21
Classification: C01B,C01P,C04B,H01M,Y02E

Abstract:
1. A process for manufacturing a material for a negative electrode of a lithium ion secondary battery, comprising isostatically pressing a spherical graphite having voids inside a particle thereof to decrease the voids; providing an apparatus that comprises a tank, a feeder and an inward-directed nozzle; supplying a flake graphite into the tank through the feeder; supplying a jet stream from the inward-directed nozzle to form a collision area at the lower portion of the tank; bringing the flake graphite into collision in the jet stream to form a spherical graphite, wherein the inward-directed nozzle discharge pressure is set from 0.01 to 0.50 MPa, the flow rate of the gas supplied from the inward-directed nozzle is set from 0.2 to 1.0 Nm 3 /min, the internal pressure in the tank is set from −10 to 30 KPa, and the operational period is set from 1 to 100 minutes.