Abstract: The invention provides an anode material for lithium ion secondary battery using a coated graphite powder as a raw material, which is coated thermoplastic resin of a carbonization yield of ?20 wt % in a proportion of ?10 parts by weight the carbonized material per 100 parts by weight graphite powder. Coating with thermoplastic resin increases the accumulative pore volume by ?5%, relative to the uncoated powder, and results in pore sizes of 0.012-40 ?m via mercury porosimeter method. Calculated with the BJH method as viewed from desorption isotherm, the coated graphite powder has a mesopore volume ?0.01 cc/g or ?60% of the pore volume of the uncoated graphite powder. This coated powder also has an average particle size ranging from 10-50 ?m measured by a laser-scattering-particle-size-distribution measuring device, and a standard deviation to the average particle size (?/D) ratio of ?0.02.

Abstract: There is obtained a carbon material for lithium-ion secondary battery negative electrode, a low-crystalline carbon impregnated carbon material for lithium-ion secondary battery negative electrode, a negative electrode plate, and a lithium-ion secondary battery, each of which realizes a first charge/discharge cycle with less gas generation and provides a rapid charge/discharge. The carbon material is obtained by: blending and kneading a carbonaceous aggregate with a binder to form a composition; press molding the composition into an article; carbonizing the press molded article; graphitizing the article to obtain an artificial graphite block; milling the block; and carrying out particle size control. The carbon material has characteristics of: (1) R-value=(I1360/I1580)?0.2, where R-value is defined by the ratio of D band to G band in Raman spectrum using Nd:YAG laser light of 532 nm wavelength; and (2) d(002)?0.

Abstract: The invention provides an anode material for lithium ion secondary battery using a coated graphite powder as a raw material. The coated graphite powder is coated with carbonized material of thermoplastic resin of a carbonization yield of not more than 20 wt % in a proportion of not more than 10 parts by weight the carbonized material per 100 parts by weight graphite powder. The graphite powder as coated with thermoplastic resin increases 5% or more in accumulative pore volume of the graphite powder having a pore size of 0.012 ?m to 40 ?m as measured by a mercury porosimeter method, as compared with the graphite powder before coated with the thermoplastic resin. The coated graphite powder has a mesopore volume defined by IUPAC of 0.