| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery having an excellent cycle characteristic, and excelling in a capacity recovery rate after storage in an overdischarged state, by improving a negative electrode material. SOLUTION: This nonaqueous electrolyte secondary battery includes a positive electrode capable of reversibly storing and releasing lithium, a negative electrode including an alloy material as an active material, and a nonaqueous electrolyte. The alloy material includes a phase (phase A) containing at least Si and a phase (phase B) containing an intermetallic compound composed of Si and at least one kind selected from the group consisting of Ti, Zr, Ni and Cu; and the alloy material contains 0.0006 to 1.0 wt.% of Fe in a metallic state. COPYRIGHT: (C)2007,JPO&INPIT |
