Si ALLOY NEGATIVE ELECTRODE ACTIVE MATERIAL FOR ELECTRICAL DEVICE

[Problem] Provided is a negative electrode active material for an electric device which exhibits a well-balanced property of maintaining a high cycle property and attaining a high initial capacity. [Technical solution] The negative electrode active material for an electric device comprising an alloy having a composition formula Si x Zn y Al z (where each of x, y, and z represents amass percent value, satisfying (1) x+y+z=100, (2) 21¤x