Abstract: A negative electrode active material for a lithium ion secondary battery, made up of substantially spherical graphite particles (A), having fine protrusions on the surfaces thereof and obtained by impregnating and coating substantially spherical graphite particles with a mixture of pitch and carbon black, followed by baking in a range of 900 to 1500° C. In accordance with Raman spectroscopic analysis of the particles (A) using argon laser Raman scattering light, there exists a G-band composite peak comprising peaks in the vicinity of 1600 cm?1, and 1580 cm?1, respectively, and at least one peak in the vicinity of D-band at 1380 cm?1, an interlayer distance of the lattice plane d002, obtained by wide-range X-ray diffraction, being in the range of 0.335 to 0.337 nm.

Abstract: A negative electrode active material for a lithium ion secondary battery, made up of substantially spherical graphite particles (A), having fine protrusions on the surfaces thereof and obtained by impregnating and coating substantially spherical graphite particles with a mixture of pitch and carbon black, followed by baking in a range of 900 to 1500° C. In accordance with Raman spectroscopic analysis of the particles (A) using argon laser Raman scattering light, there exists a G-band composite peak comprising peaks in the vicinity of 1600 cm?1, and 1580 cm?1, respectively, and at least one peak in the vicinity of D-band at 1380 cm?1, an interlayer distance of the lattice plane d002, obtained by wide-range X-ray diffraction, being in the range of 0.335 to 0.337 nm.

Abstract: A negative electrode active material for a lithium ion secondary battery, made up of substantially spherical graphite particles (A), having fine protrusions on the surfaces thereof and obtained by impregnating and coating substantially spherical graphite particles with a mixture of pitch and carbon black, followed by baking in a range of 900 to 1500° C. In accordance with Raman spectroscopic analysis of the particles (A) using argon laser Raman scattering light, there exists a G-band composite peak comprising peaks in the vicinity of 1600 cm?1, and 1580 cm?1, respectively, and at least one peak in the vicinity of D-band at 1380 cm?1, an interlayer distance of the lattice plane d002, obtained by wide-range X-ray diffraction, being in the range of 0.335 to 0.337 nm.

Abstract: A negative electrode active material for lithium ion capacitor, which reduces the thickness of a negative-electrode active material layer while maintaining the conventional level of energy density. The negative-electrode active material is a composite carbon material manufactured by kneading a carbon black having an average particle diameter of 12 to 300 nm with a carbon precursor such as pitch, the resulting mixture is baked or graphitized baking between 800° C. to 3200° C., and then pulverized such that the average particle diameter (D50) thereof is 1 to 20 ?m and the BET specific surface area is between 100-350 m2/g. An initial charging capacity is at least 700 mAh/g, and the cell volume is reduced as the thickness of the negative electrode active material layer becomes thinner than the conventional one.

Abstract: A negative electrode active material for a lithium ion secondary battery, made up of substantially spherical graphite particles (A), having fine protrusions on the surfaces thereof and obtained by impregnating and coating substantially spherical graphite particles with a mixture of pitch and carbon black, followed by baking in a range of 900 to 1500° C. In accordance with Raman spectroscopic analysis of the particles (A) using argon laser Raman scattering light, there exists a G-band composite peak comprising peaks in the vicinity of 1600 cm?1, and 1580 cm?1, respectively, and at least one peak in the vicinity of D-band at 1380 cm?1, an interlayer distance of the lattice plane d002, obtained by wide-range X-ray diffraction, being in the range of 0.335 to 0.337 nm.

Abstract: This invention provides a negative electrode active material for lithium ion capacitor, which reduces the thickness of a negative-electrode active material layer while maintaining the conventional level of energy density. The negative-electrode active material for a lithium ion capacitor is a composite carbon material manufactured by kneading a carbon black having an average particle diameter of 12 to 300 nm measured by the electron microscopy method with a carbon precursor such as pitch, the resulting mixture is baked or graphitized baking between 800° C. to 3200° C., and then pulverized such that the average particle diameter (D50) thereof is 1 to 20 ?m and the BET specific surface area is between 100-350 m2/g. An initial charging capacity is at least 700 mAh/g, and the cell volume is reduced as the thickness of the negative electrode active material layer becomes thinner than the conventional one.

Abstract: A negative electrode active material for a lithium ion secondary battery, made up of substantially spherical graphite particles (A), having fine protrusions on the surfaces thereof and obtained by impregnating and coating substantially spherical graphite particles with a mixture of pitch and carbon black, followed by baking in a range of 900 to 1500° C. In accordance with Raman spectroscopic analysis of the particles (A) using argon laser Raman scattering light, there exists a G-band composite peak comprising peaks in the vicinity of 1600 cm?1, and 1580 cm?1, respectively, and at least one peak in the vicinity of D-band at 1380 cm?1, an interlayer distance of the lattice plane d002, obtained by wide-range X-ray diffraction, being in the range of 0.335 to 0.337 nm.

Abstract: There is provided a negative electrode for a lithium ion secondary battery high in discharge capacity per unit volume, small in capacity loss at the time of initial charge/discharge, and excellent in rapid charge/discharge characteristics. Natural graphite, rendered spherical in shape, is mixed with carbon black, and pitch is added to a mixture thus formed to be thermally kneaded before baked at a temperature in a range of 900 to 1500° C., thereby obtaining graphite particles (A), each being substantially spherical in shape, and having fine protrusions on the surface thereof. Since the graphite particles (A) have the fine protrusions on the surface thereof, a multitude of electrically conducting networks are built in a complex way within an electrode, the graphite particles (A) can serve as a negative electrode material excellent in rapid charge/discharge characteristics, and power characteristics. The graphite particles (A) further baked at 3000° C.