Anode active material comprising a porous transition metal oxide, anode comprising the anode active material, lithium battery comprising the anode, and method of preparing the anode active material

Patent metadata

Field	Value
Publication number	US-9105925-B2
Application number	US-61371909-A
Country	US
Kind code	B2
Filing date	Nov 6, 2009
Priority date	Nov 10, 2008
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

An anode active material including a porous transition metal oxide; an anode including the anode active material; a lithium battery including the anode; and a method of preparing the anode active material.

First claim

What is claimed is:

1. An anode active material comprising porous transition metal oxide particles having gyroid structure, wherein the porous transition metal oxide comprises an oxide of at least one transition metal selected from the group consisting of molybdenum (Mo), and vanadium (V).

2. The anode active material of claim 1 , wherein pores of the porous transition metal oxide have a diameter of from about 3 nm to about 75 nm.

3. The anode active material of claim 1 , wherein pores of the porous transition metal oxide have a diameter of from about 5 nm to about 7 nm.

4. The anode active material of claim 1 , wherein pores of the porous transition metal oxide have a diameter of from about 3 nm to about 7 nm, and a framework formed by walls of the pores of the porous transition metal oxide has a wall thickness of from about 5 nm to about 10 nm.

5. The anode active material of claim 1 , wherein the porous transition metal oxide has a specific surface area of from about 102 m 2 /g to about 220 m 2 /g.

6. The anode active material of claim 1 , wherein the porous transition metal oxide is represented by Formula 1:
M x O y ,  <Formula 1>

wherein M is selected from the group consisting of molybdenum (Mo) vanadium (V), and a mixture thereof, 1≦x≦2, 1≦y≦8, and 2≦x+y≦10.

7. The anode active material of claim 1 , wherein the porous transition metal oxide comprises MoO 2 .

8. An anode comprising the anode active material of claim 1 .

9. An anode comprising the anode active material of claim 2 .

10. An anode comprising the anode active material of claim 4 .

11. An anode comprising the anode active material of claim 5 .

12. An anode comprising the anode active material of claim 6 .

13. A lithium battery including the anode of claim 8 .

14. The lithium battery of claim 13 , wherein the lithium battery has a discharge capacity of at least about 1000 mAh/g of the anode active material.

15. A method of preparing an anode active material comprising porous transition metal oxide particles having gyroid structure, wherein the porous transition metal oxide comprises an oxide of at least one transition metal selected from the group consisting of molybdenum (Mo), and vanadium (V), the method comprising:
impregnating a porous compound with a solution comprising a transition metal salt to provide an impregnated porous compound;
calcinating the impregnated porous compound in a first reducing atmosphere to provide a calcined product; and
etching the calcinated product using an etching solution to provide an etched product.

16. The method of claim 15 , wherein the porous compound is silica (SiO 2 ).

17. The method of claim 15 , wherein the calcinating of the impregnated porous compound is performed at a temperature of from about 500° C.

18. The method of claim 15 , wherein the etching solution is a hydrofluoric acid (HF) solution.

19. The method of claim 15 ,
wherein the first reducing atmosphere comprises hydrogen.

20. The method of claim 15 , further comprising thermally treating the etched product in a second reducing atmosphere, after the etching of the calcinated product.

21. The method of claim 20 , wherein the thermally treating of the etched product is performed at a temperature of from about 100° C. to about 500° C.

22. The method of claim 20 ,
wherein the second reducing atmosphere comprises hydrogen.

23. An anode active material comprising porous transition metal oxide particles having gyroid structure represented by Formula 1:
M x O y ,  <Formula 1>

wherein,
M is selected from the group consisting of molybdenum (Mo), vanadium (V), and a mixture thereof, 1≦x≦2, 1≦y≦8, and 2≦x+y≦10, and

pores of the transition metal oxide are disposed in a matrix and extend in parallel to one another.

Assignees

• Kim Han-Su
• Pak Chan-Ho
• Kim Ji-Man
• Sohn Jeong-Kuk
• Kong Soo-Sung
• Samsung Electronics Co Ltd

Inventors

• Kim Han-Su
• Pak Chan-Ho
• Kim Ji-Man
• Sohn Jeong-Kuk
• Kong Soo-Sung

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/0416

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title