Synthetic graphite material, synthetic graphite material production method, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

Abstract

A synthetic graphite material wherein the crystal grain size L(112) in the c-axis direction as calculated from a (112) diffraction line obtained by wide-angle X-ray diffraction is 4-30 nm, the surface area based on volume as calculated by a laser diffraction-type particle size distribution measurement device is 0.22-1.70 m2 / cm3, the oil absorption is 67-147 mL / 100g, and the half-value width [delta][nu]G is 19-24 cm-1 for a peak appearing in the wavelength region of 1580 cm-1+ / -100 cm-1 in Raman spectroscopy using argon ion laser light having a wavelength of 514.5 nm.

Description

technical field

[0001] The invention relates to an artificial graphite material, a manufacturing method of the artificial graphite material, a negative electrode for a lithium-ion secondary battery, and a lithium-ion secondary battery.

[0002] This application claims priority based on Japanese Patent Application No. 2019-004663 for which it applied in Japan on January 15, 2019, and uses the content here. Background technique

[0003] Lithium-ion secondary batteries are used in industrial applications such as automobiles and power storage for system infrastructure.

[0004] Graphite, such as an artificial graphite material, is used as a negative electrode material of a lithium ion secondary battery (for example, refer patent document 1.).

[0005] Batteries suitable for automotive use are used in a wide temperature range from low temperatures below 0°C to high temperatures above 60°C. However, in a lithium ion secondary battery using graphite as a negative electrode materi...

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