| abstract |
The present invention relates to negative electrode active material, preparation method, negative electrode for lithium secondary battery and lithium secondary battery.Negative electrode active material for lithium rechargeable battery includes the Si Al Fe alloys represented by formula 1.The Si Al Fe alloys include Si phases and alloy phase, are mutually about 3 including atomic percentage ratio with the alloy:3:2 Si, Al and Fe, wherein 50 atom %≤x≤90 atom %, 5 atom %≤y≤30 atom %, 5 atom %≤z≤30 atom %, the atom % of and x+y+z=100.The xSi yAl zFe of formula 1. |