Patent ID: 6335121
Filing Date: 2002-01-01
Classification: C01B,C01P,H01M,Y02E

Abstract:
A negative electrode material for a non-aqueous secondary battery, comprising a carbonaceous material,wherein a value of R (degree of graphitization) being defined as a ratio of a Raman spectrum intensity at 1580 cmâˆ’1 to a Raman spectrum intensity at 1360 cmâˆ’1 in the Raman spectrum analysis is not more than 4.0, a length of crystallite (Lc) oriented along a crystallographic c axis obtained by a wide angle X-ray diffraction method is from 25 to 35 nm, and the carbonaceous material contains 1 to 20% by weight of boron and 0.1 to 10% by weight of silicon or germanium.