Composite anode active material, anode and lithium battery containing the material, and method of preparing the composite anode active material
AssigneeSamsung SDI Co., Ltd.
InventorsXianhui Meng, Sanghyuck Ahn, Sukyung Lee, Yeongap Kim, Youngjin Choi, Deokhyun Kim
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Abstract
Provided is a composite anode active material with pores having a composition represented by Formula 1, and, the composite anode active material contains an amorphous phase including Si and a nano-crystalline phase including a metal silicide: SixMyCz <Formula 1> wherein, in Formula 1, x, y, and z each represent an atomic percentage; x+y+z=100; x>y+z; x>0, y>0, and z≧0; and M is at least one metal selected from Mn, Mo, Nb, W, Ta, Fe, Cu, Ni, Co, Zr, Y, and a combination thereof.
Claims20
A composite anode active material comprising:
- a composition represented by Formula 1;
- and
- a multi-phase microstructure containing an amorphous phase comprising Si and a nano-crystalline phase comprising a metal silicide;
- wherein the composite anode active material is porous:
- SixMyCz <Formula 1>
- wherein, in Formula 1,
- x, y, and z each represent an atomic percentage;
- x+y+z=100;
- x>y+z;
- x>0, y>0, and z≧0;
- and
- M is at least one metal selected from Mn, Mo, Nb, W, Ta, Fe, Cu, Ni, Co, Zr, Y, and a combination thereof.
A method of preparing a composite anode active material, the method comprising:
- preparing a precursor composition comprising Si, M, and optionally C, wherein the precursor composition has a multi-phase microstructure containing an amorphous phase comprising Si, a nano-crystalline phase comprising a metal silicide, and another nano-crystalline phase formed of a metal;
- and
- preparing a porous composition represented by Formula 1 below by contacting the precursor composition with a strong acid:
- SixMyCz <Formula 1>
- x, y, and z each represent an atomic percentage;
- x+y+z=100;
- x>y+z;
- x>0, y>0, and z≧0;
- and
- M is at least one metal selected from Mn, Mo, Nb, W, Ta, Fe, Cu, Ni, Co, Zr, Y, and a combination thereof.
Dependencies are inferred from the claim text.