Material for negative electrode of lithium secondary battery, method for production thereof and lithium secondary battery using the same

摘要

A calcined two-layer carbon material is prepared characterized in that edge parts of a core carbon material are particularly or entirely coated with a coat-forming carbon material and that the carbon material is nearly spherical or ellipsoidal, wherein the carbon material has a specific surface area determined by a BET method of 5 m2/g or less.