NANOSIZED PARTICLES, NANOSIZED-PARTICLES-INCLUDED NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, LITHIUM ION SECONDARY BATTERY, AND METHOD OF MANUFACTURING NANOSIZED PARTICLES

摘要

PPROBLEM TO BE SOLVED: To provide a negative electrode material for a lithium ion secondary battery, which achieves a high capacity and a satisfactory cycle property. PSOLUTION: The nanosized particles include an element (A) and an element (D) that are of different types. The element (A) is one element chosen from a group of Si, Sn, Al, Pb, Sb, Bi, Ge, In and Zn, and the element (D) is one element chosen from a group of Fe, Co, Ni, Ca, Sc, Ti, V, Cr, Mn, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Ba, lanthanoid element (except Ce and Pm), Hf, Ta, W, Re, Os and Ir. The particles have a first phase of a spherical shape, which is a simple substance or solid solution of the element (A), and a second phase that is a compound of the element (A) and the element (D), a portion or all of the second phase being covered with the first phase. There is also provided a negative electrode material for a lithium ion secondary battery including the nanosized particles as a negative-electrode active material. PCOPYRIGHT: (C)2011,JPO&INPIT