| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative electrode material for lithium secondary battery having a high capacity, a long cycle service life and the high discharging characteristic. SOLUTION: A negative electrode material impregnated with the doping element contained Si into pores of a porous SiC sintered compact is manufactured by dipping the porous SiC sintered compact into the molten Si, in which the doping element (B, P, As or Sb) is added, or dipping the non-sintered compact composed of the SiC powder, C powder, the mixture powder of the Si powder and the C powder, and the mixture powder of the SiC powder and the C powder into the molten Si containing the doping element. This negative electrode material is formed of particles including the Si phase and the SiC phase, and the Si phase contains the doping element and a part of the Si phase is exposed in a particle surface, and other parts of the Si phase except for the part exposed in the particle surface are in contact with the SiC phase. |
