Patent ID: 6420070
Filing Date: 2002-07-16
Classification: H01M,Y02E

Abstract:
An anode for a nonaqueous electrolyte secondary battery, the anode comprising a particulate graphite material on a current collector;wherein:said graphite material is capable of intercalating and de-intercalating lithium ions, said anode is prepared by applying a paste compound comprising said graphite material and a binder to said current collector, and rolling said paste material on said collector, said current collector is made of metal foil, R is in the range of 0.05 to 0.5, R/Ro is in the range of 0. 1 to 0.7, R is the ratio of the intensity of the peak corresponding to the (100) lattice plane of graphite material in said anode to the intensity of the peak corresponding to the (004) lattice plane of said graphite material in said anode, Ro is the ratio of the intensity of the peak corresponding to the (100) lattice plane of unorientated graphite material to the intensity of the peak corresponding to the (004) lattice plane of said unorientated graphite material, obtained by a powder diffraction measurement of said unorientated graphite material before preparation of said anode, and said intensities are obtained by wide angle X-ray diffraction measurements using a diffractometer with a CuK&agr; X-ray source.