Patent ID: 9203085
Filing Date: 2015-12-01
Classification: C22C,H01M,Y02E

Abstract:
1. An anode active material for a lithium secondary battery, comprising a silicon alloy that comprises silicon and at least one kind of metal other than silicon, the silicon alloy allowing alloying with lithium, wherein the silicon alloy has an active phase region reacting with lithium, which is a silicon phase, and an inactive phase region not reacting with lithium, which is a phase constituted with silicon and a metal other than silicon, or only the metal other than silicon, wherein a volume of the inactive phase region in the silicon alloy not reacted with lithium, is 50 to 75% of the entire volume of the silicon alloy, and wherein the silicon alloy is expressed by the following Chemical Formula 1: where A and B are independently Sn, Zr, Mn, Ni, Fe, Ca, Ce, La, Cr, Al, Co, Sb, Bi, As, Ge, Pb, Zn, Cd, In, Ti, or Ga, A and B are different from each other, and x, y, and z are atom % in which x+y+z=100, 60≦x<100, 0<y<30, 0<z<30.