| 摘要 |
Disclosed is an Si-based-alloy anode material for a lithium ion secondary battery. The Si-based-alloy anode material comprises an alloy phase configured from an Si primary phase comprising Si, and a compound phase comprising at least two elements. The at least two elements include: at least one first added element (A) selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, and Mg; and at least one low-melting-point second added element (B) selected from the group consisting of S, Se, Te, Sn, In, Ga, Pb, Bi, Zn, Al, and Ag. The compound phase: (i) contains a first compound phase comprising Si and a first added element (A), a second compound phase comprising a first added element (A) and a second added element (B), and a single phase of a second added element (B) and/or a third compound phase comprising at least two second added elements (B); or (ii) a compound phase comprising Si and a first added element (A), and a single phase of a second added element (B) and/or a compound phase comprising at least two second added elements (B). The average minor axis width of the Si primary phase is no greater than 4 mum. By means of the anode material, it is possible to provide a secondary battery having favorable charging/discharging capacity and cycle life. |
