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

A production method of the synthetic graphite material, comprising at least:

• a step of performing a coking treatment on a raw material oil composition by performing a delayed coking process to generate a raw coke composition;
• a step of pulverizing the raw coke composition to obtain heat-treated raw coke powder;
• a step of performing a heat treatment on the heat-treated raw coke powder to obtain graphite powder;
• and
• a step of pulverizing the graphite powder,
• wherein the synthetic graphite material has:
• a size L (112) of a crystallite in a c-axis direction as calculated from a (112) diffraction line obtained by an X-ray wide angle diffraction method being in a range of 4 to 30 nm,
• a surface area based on a volume as calculated by a laser diffraction type particle size distribution measuring device being in a range of 0.22 to 1.70 m2/cm3,
• an oil absorption being in a range of 67 to 147 mL/100 g, and
• a nitrogen adsorption specific surface area being in a range of 3.1 to 8.2 m2/g.