| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a negative electrode material for a lithium ion secondary battery that achieves high capacity and good cycle characteristics. <P>SOLUTION: Nanoscale particles are provided, which contain an element (A) and an element (M) different from each other, wherein the element (A) is at least one element selected from the group consisting of Si, Sn, Al, Pb, Sb, Bi, Ge, In and Zn, and the element (M) is at least one element selected from the group consisting of Cu, Ag and Au, which have a first phase comprising a simple substance or a solid solution of the element (A), and a second phase comprising a compound of the element (A) and the element (M) or a simple substance or a solid solution of the element (M). The first phase contains oxygen; the first phase and the second phase are joined via an interface; both of the first phase and the second phase are exposed on an outer surface; and the first phase and the second phase have spherical surfaces except for the interface. The negative material for a lithium ion secondary battery contains the above nanoscale particles as a negative active material. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
