Negative electrode material for lithium ion secondary battery, method of producing negative electrode material for lithium ion secondary battery, negative electrode for lithium ion secondary battery and lithium ion secondary battery

A negative electrode material for a lithium ion secondary battery, the negative electrode material comprising at least one selected from the group consisting of a spherical natural graphite particle and a composite particle which is aggregate of the spherical natural graphite particles,

• wherein the spherical natural graphite particle and the composite particle have an average particle diameter (D50) of 12 μm or less and an integrated pore volume in a pore size range of from 0.003 μm to 90 μm of from 0.59 mL/g to 0.80 mL/g.

A method of producing a negative electrode material for a lithium ion secondary battery, the method comprising:

• preparing a rubber mold that contains graphite particles;
• and
• dry-pressuring the rubber mold from the outside isotropically.