AMORPHOUS ALLOY, NEGATIVE ELECTRODE MATERIAL FOR SECONDARY BATTERY COMPRISING THE SAME, NEGATIVE ELECTRODE FOR SECONDARY BATTERY CONTAINING THE SAME, AND SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide an amorphous alloy for obtaining a lithium ion secondary battery having high capacity and excellent charge-discharge cycle characteristics.SOLUTION: The amorphous alloy contains Si and Al, further contains at least two kinds of elements selected from Fe, Cr, Ni, and Zr, satisfies the condition that the sum of the atomic percentages of Si content and Al content is in the range of 70 to 90 atom%, and satisfies the following formula (1): 1(the atomic percentage of Si content)/(the atomic percentage of Al content)3.