Anode material for lithium ion secondary battery, method of producing anode material for lithium ion secondary battery, anode for lithium ion secondary battery, and lithium ion secondary battery

An anode material for a lithium ion secondary battery, the anode material comprising a carbon material satisfying the following (1), (2), (4), (6), and (7):

• (1) an average particle size (D50) is 22 μm or less;
• (2) D90/D10 of particle sizes is 2.0 or less;
• (4) a tap density is 1.00 g/cm3 or more;
• (6) a portion of the carbon material with a sphericity of from 0.6 to 0.8 and a particle size of from 10 μm to 20 μm is 5% by number or more;
• and
• (7) a portion of the carbon material with the sphericity of 0.7 or less and a particle size of 10 μm or less is 0.3% by number or less.

An anode material for a lithium ion secondary battery, the anode material comprising a carbon material satisfying the following (1), (2), and (5) to (7):

• (1) an average particle size (D50) is 22 μm or less;
• (2) D90/D10 of particle sizes is 2.0 or less;
• (5) in a case in which the carbon material is stirred in purified water containing a surfactant, and then irradiated with ultrasonic waves for 15 minutes with an ultrasonic cleaner, a ratio of D10 after the ultrasonic irradiation to D10 before the ultrasonic irradiation (D10 after ultrasonic irradiation/D10 before ultrasonic irradiation) is 0.90 or more;
• (6) a portion of the carbon material with a sphericity of from 0.6 to 0.8 and a particle size of from 10 μm to 20 μm is 5% by number or more;
• and
• (7) a portion of the carbon material with the sphericity of 0.7 or less and a particle size of 10 μm or less is 0.3% by number or less.