Patent ID: 7037623
Filing Date: 2006-05-02
Classification: H01M,Y02E,Y10T

Abstract:
1. A method for making a negative electrode carbonaceous material comprising the steps of: (a) carbonizing a raw material, (b) heating the product of step (a) at a temperature of at most 200° , in the presence of an oxidizer; and (c) graphitizing the product of step (b), wherein a ratio RG=Gs/Gb of the product of step (c) is at least 4.5, wherein: wherein: Hba is the height of a peak lying in a range of 1,580 cm Hbb is the height of a peak lying in a range of 1,350 cm−1 to 1,400 cm−1 in a second Raman spectrum, said second Raman spectrum being measured by means of an argon laser Raman spectrometer of a wavelength of 514.5 nm and a wavelength resolution of 4 cm Hsa is the height of a peak lying in a range of 1,580 cm Hsb is the height of a peak lying in a range of 1,350 cm