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

The negative electrode material for a lithium ion secondary battery contains at least one selected from the group consisting of spherical natural graphite particles and composite particles that are aggregates of the spherical natural graphite particles. The average particle diameter (D50) of the spherical natural graphite particles and the composite particles is 12 [mu] m or less, and at least one of (1) the linseed oil absorption is 45 mL/100 g to 65 mL/100 g and (2) the cumulative pore volume in the pore diameter range of 0.003 [mu] m to 90 [mu] m is 0.59 mL/g to 0.8 mL/g. 锂离子二次电池用负极材料包含选自由球状天然石墨粒子和作为所述球状天然石墨粒子的凝聚体的复合粒子组成的组中的至少一者。所述球状天然石墨粒子和所述复合粒子的平均粒径(D50)小于或等于12μm，且满足(1)亚麻仁油吸油量为45mL/100g～65mL/100g和(2)细孔直径0.003μm～90μm范围的累积细孔容积为0.59mL/g～0.8mL/g中的至少一个。