Patent ID: 8999580
Filing Date: 2015-04-07
Classification: H01M,Y02E,Y02P,Y02T,Y10T

Abstract:
1. Composite graphite particles, comprising a core material consisting of graphite having an interlayer distance d(002) of 0.337 nm or less, a surface layer consisting of graphite in which the intensity ratio I D /I G (R value) between the peak intensity (I D ) in a range of 1300 to 1400 cm −1 and the peak intensity (I G ) in a range of 1580 to 1620 cm −1 as measured by Raman scattering spectroscopy is 0.4 or higher, wherein the peak intensity ratio I 110 /I 004 between the peak intensity (I 110 )of face (110) and the peak intensity (I 004 ) of face (004) obtained by XRD measurement on the graphite crystal is 0.15 or higher when the graphite has been mixed with a binder and pressure-molded to a density of 1.55 to 1.65 g/cm 3 , and vapor-grown carbon fiber attached on the surface layer via carbon, wherein the vapor grown carbon fiber is attached on the surface layer via carbon by a process of mixing the vapor grown carbon fiber with an organic compound, polymerizing the organic compound in the mixture and then carbonizing the organic compound to form the surface layer, wherein the surface layer graphite is obtained by thermally treating the organic compound at a temperature of 1000 to 2700° C., wherein the organic compound is at least one selected from a group consisting of phenol resin, polyvinylalcohol resin, furan resin, cellulose resin, polystyrene resin, polyimide resin and epoxy resin, wherein the coating amount of the organic compound serving as raw material for the surface layer is in a range of 15 to 30% by mass based on the core material, and wherein the R value of the core material is smaller than that of the surface layer graphite.