Composite anode active material, anode including the composite anode active material, and lithium secondary battery including the anode
A composite anode active material includes a silicon-based material, a metal fluoride, and a carbon-based material. The metal fluoride may be a compound represented by the following formula: MFx, where M is at least one selected from magnesium (Mg), aluminum (Al), titanium (Ti), copper (Cu), zinc (Zn), barium (Ba) and bismuth (Bi), and 0<x≤4.
1. A composite anode active material comprising:
a silicon-based material;
a metal fluoride; and
a carbon-based material
wherein the silicone-based material, the metal fluoride and the carbon-based material bind directly to one another wherein the metal fluoride is a compound represented by the following formula: MFx, wherein M is at least one selected from magnesium (Mg), aluminum (Al), titanium (Ti), copper (Cu), zinc (Zn), barium (Ba) and bismuth (Bi); and 0<x≤4.
2. The composite anode active material of claim 1 , wherein the metal fluoride is at least one selected from aluminum fluoride (AlF 3 ), magnesium fluoride (MgF 2 ), and copper fluoride (CuF 2 ).
3. The composite anode active material of claim 1 , wherein the carbon-based material is at least one selected from carbon nanotubes, graphite, graphene, carbon black, and a polymer carbonized product.
4. The composite anode active material of claim 1 , wherein an amount of the metal fluoride is in a range of about 1 part to about 70 parts by weight based on 100 parts by weight of the composite anode active material.
5. The composite anode active material of claim 1 , wherein an amount of the carbon-based material is in a range of about 1 part to about 50 parts by weight based on 100 parts by weight of the composite anode active material.
6. The composite anode active material of claim 1 , wherein the composite anode active material has a structure comprising:
a core comprising the silicon-based material; and
a coating layer on at least a part of the core,
wherein the coating layer comprises the metal fluoride and the carbon-based material.
7. The composite anode active material of claim 6 , wherein the coating layer has a single-layer or multi-layer structure.
8. The composite anode active material of claim 1 , wherein the composite anode active material has a structure comprising:
a core comprising the silicon-based material; and
a coating layer on at least a part of the core,
wherein the coating layer comprises:
a first coating layer on the core; and
a second coating layer on the first coating layer,
wherein
the first coating layer comprises one of the metal fluoride and the carbon-based material, and
the second coating layer comprises the other of the metal fluoride and the carbon-based material.
9. The composite anode active material of claim 1 , wherein the weight ratio of the mixing weight ratio of the silicone-based material and metal fluoride is 1:1.42 to 1:1.71.
10. The composite anode active material of claim 1 , wherein an amount of the metal fluoride is in a range of about 50 part to about 60 parts by weight based on 100 parts by weight of the composite anode active material.
11. An anode comprising a composite anode active material on a current collector,
wherein the composite anode active material comprises:
a silicon-based material;
a metal fluoride; and
a carbon-based material,
wherein the silicone-based material, the metal fluoride and the carbon-based material bind directly to one another wherein the metal fluoride is a compound represented by the following formula: MFx, wherein M is at least one selected from magnesium (Mg), aluminum (Al), titanium (Ti), copper (Cu), zinc (Zn), barium (Ba) and bismuth (Bi); and 0<x≤4.
12. The anode of claim 11 , wherein the metal fluoride is at least one selected from aluminum fluoride (AlF 3 ), magnesium fluoride (MgF 2 ), and copper fluoride (CuF 2 ).
13. The anode of claim 11 , wherein the carbon-based material is at least one selected from carbon nanotubes, graphite, graphene, carbon black and a polymer carbonized product.
14. The anode of claim 11 , wherein an amount of the metal fluoride is in a range of about 1 part to about 70 parts by weight based on 100 parts by weight of the composite anode active material.
15. The anode of claim 11 , wherein an amount of the carbon-based material is in a range of about 1 part to about 50 parts by weight based on 100 parts by weight of the composite anode active material.
16. The anode of claim 11 , wherein the composite anode active material comprises:
a core comprising the silicon-based material; and
a coating layer on at least a part of the core,
wherein the coating layer comprises the metal fluoride and the carbon-based material.
17. The anode of claim 16 , wherein the coating layer has a single-layer or multi-layer structure.
18. The anode of claim 11 , wherein the composite anode active material has a structure comprising:
a core comprising the silicon-based material; and
a coating layer on at least a part of the core,
wherein the coating layer comprises:
a first coating layer on the core; and
a second coating layer on the first coating layer,
wherein
the first coating layer comprises one of the metal fluoride and the carbon-based material, and
the second coating layer comprises the other of the metal fluoride and the carbon-based material.
19. A lithium secondary battery comprising the anode of claim 11 .