Negative for lithium-ion secondary battery electrode material

Lithium ions and particles comprising capable of absorbing and releasing element (B), the carbon nanotube 95% (number basis) or higher have the following fiber diameter 40nm or more 5 nm (C), a mixed solution containing water, to obtain a paste or slurry is pressed into the grinding nozzles of a high-pressure dispersion apparatus, the method by drying the paste or slurry powdered involves mixing the powder and the carbon particles (a), carbon particles ( a), and lithium ion particles comprising capable of absorbing and releasing element (B) and 95% (coagulation by number) or more is carbon nanotubes (C) and are uniformly complexed with 40nm less fiber diameter than 5nm obtaining a negative electrode material for a lithium ion secondary battery containing Atsumaritai.