| 摘要 |
The invention provides composite graphite particles, comprising a core material consisting of graphite having a interlayer distance d(002) of 0.337 nm or less and a surface layer consisting of graphite in which the intensity ratio I D /I G (R value) between the peak intensities (I D ) in a range of 1300 to 1400 cm -1 and (I G ) in a range of 1580 to 1620 cm -1 as measured by Raman scattering spectroscopy is 0.3 or higher, wherein the peak intensity ratio I 110 /I 004 between the peak intensities (I 110 ) of face (110) and (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 , which composite graphite particles are useful in a secondary battery negative electrode having a high capacity, high charge/discharge characteristics and an excellent charging property, and also provides a paste for negative electrode, a negative electrode and a lithium secondary battery using the composite graphite. |
