NANOSIZE PARTICLE, NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY CONTAINING THE NANOSIZE PARTICLE, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, LITHIUM ION SECONDARY BATTERY, AND METHOD FOR PRODUCING THE NANOSIZE PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a negative electrode material for a lithium ion secondary battery which achieves high volume and satisfactory cycle properties. SOLUTION: A nanosize particle 1 contains an element A-1 and an element A-2 as two kinds of elements selected from the group consisting of Si, Sn, Al, Pb, Sb, Bi, Ge, In and Zn, and has a first phase 3 as the single substance or solid solution of the element A-1 and a second phase 5 as the simple substance or solid solution of the element A-2. Both of the first phase 3 and the second phase 5 are exposed to the outer surfaces, and the outer surfaces of the first phase and the second phase are non-spherical. The negative electrode material for a lithium ion secondary battery uses the nanosize particle. COPYRIGHT: (C)2011,JPO&INPIT