| 摘要 |
[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 SixZnyAlz (where each of x, y, and z represents amass percent value, satisfying (1) x+y+z=100, (2) 21≰x<100, (3) 0<y<79, and (4) 0<z<79).
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