NANOSCALE PARTICLE, NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY CONTAINING THE SAME, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, LITHIUM ION SECONDARY BATTERY, METHOD FOR PRODUCING THE NANOSCALE PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a negative electrode material for a lithium ion secondary battery that achieves high capacity and good cycle characteristics.SOLUTION: This nanoscale particle includes different kinds of element A and element D. The element A is at least one kind of element selected from a group consisting of Si, Sn, Al, Pb, Sb, Bi, Ge, In and Zn. The element D is at least one kind of element selected from a group consisting of Fe, Co, Ni, Ca, Sc, Ti, V, Cr, Mn, Sr, Y, Zr, Nb, Mo, Ru, Rh, Ba, lanthanoid elements (other than Ce and Pm), Hf, Ta, W and Ir. The nanoscale particle includes at least a first phase as a simple substance or solid solution of the element A and a second phase as a compound of the element A and element D. The negative electrode material for the lithium ion secondary battery includes the nanoscale particles as a negative electrode active material.