| 摘要 |
Provided is Si-alloy powder for a lithium-ion secondary battery negative electrode active material having a higher discharging capacity and excellent in cycle life and also provided is a method for manufacturing the Si-alloy powder. The Si-alloy powder for the lithium-ion secondary battery negative electrode according to the present invention is formed by containing C of 0.01 to 0.5 at%, either one element or two or more elements of Cr, Ti, Al, and Sn having a total amount of 10 to 25 at%, the remaining Si, and unavoidable impurities and satisfies the following two equations (1), (2): 0.15 ≤ Cr at%/(Cr at% + Ti at% + Al at% + Sn at%) ≤ 1.00 … (1) (Al at% + Sn at%)/(Cr at% + Ti at% + Al at% + Sn at%) ≤ 0.40 … (2) |
