Patent ID: 6733922
Filing Date: 2004-05-11
Classification: H01M,Y02E,Y10T

Abstract:
A carbonaceous material comprising:a graphite particle having a 002 plane interval d002 of less than 0.337 nm, as measured by the X-ray wide angle diffraction method; a complex particle disposed and distributed in the vicinity of the surface of the graphite particle, the complex particle comprising silicon and carbon and having a particle size smaller than that of the graphite particle; and an amorphous carbon layer having a 002 plane interval d002 of more than 0.37 nm, as measured by the X-ray wide angle diffraction method, the amorphous carbon layer being a polymer layer and being coated on the graphite particle and the complex particle rendering them bound; wherein the complex particle comprises a Si particulate, a conductive carbon material disposed and distributed in the vicinity of the surface of the Si particulate, and a rigid carbon material layer coated on the Si particulate and the conductive carbon material rendering them bound, the Si particulate being composed of a crystalline Si phase.