NEGATIVE ACTIVE MATERIAL, NEGATIVE ELECTRODE INCLUDING THE SAME, METHOD OF MANUFACTURING THE NEGATIVE ELECTRODE, AND LITHIUM BATTERY INCLUDING THE NEGATIVE ELECTRODE

• US 20100159331A1
• Filed: 10/07/2009
• Published: 06/24/2010
• Est. Priority Date: 12/23/2008
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Bae, Joon-won, Heo, Jeong-na, Lee, Jeong-hee, Kang, Ho-suk, Son, Yoon-chul, Han, In-taek
• Application Number:
  US12/575,031
• Publication Number:
  US 20100159331A1
• Time in Patent Office: Days
• US Class Current: 429/231.800
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A negative active material, a negative electrode including the negative active material, a method of manufacturing the negative electrode, and a lithium battery including the negative electrode. The negative active material includes a composite including a non-carbonaceous material, carbon nanotubes (CNTs), and carbon nanoparticles. The carbon nanoparticles are formed by carbonizing a polymer of carbonizable monomers.

Claims

1. A negative active material comprising a composite that comprises a non-carbonaceous material, carbon nanotubes (CNTs), and carbon nanoparticles.

2. The negative active material of claim 1, wherein the CNTs are dispersed on a surface of the non-carbonaceous material, and the carbon nanoparticles are coated on the CNTs and the non-carbonaceous material.

3. The negative active material of claim 1, wherein the carbon nanoparticles comprise polymers formed of carbonized monomers.

4. The negative active material of claim 3, wherein the carbonized monomers are formed by carbonizing pyrrol, divinylbenzene, or acrylonitrile monomers.

5. The negative active material of claim 1, wherein a weight ratio of the non-carbonaceous material to the CNTs is in a range of from about 2:

1 to about 50;

1.

6. The negative active material of claim 1, wherein the amount of the carbon nanoparticles is in a range of from about 10 weight % to about 50 weight %, based on the total weight of the composite.

7. The negative active material of claim 1, wherein the non-carbonaceous material comprises at least one material selected from the group consisting of Si, silicon oxide (SiO_x where 0<

x<

2), Si—

Y, and a mixture thereof, wherein Y is selected from the group consisting of As, Sb, Bi, Cu, Ni, Mg, In, Zn, Ag, Al, and a combination thereof.

8. The negative active material of claim 1, wherein the average particle size of the non-carbonaceous material is in a range of about 10 nm to about 50 nm.

9. A negative electrode comprising:

a collector; and

an active material layer disposed on the collector, comprising the negative active material of claim 1.

10. A lithium battery comprising:

the negative electrode of claim 9;

a positive electrode comprising a positive active material; and

an electrolyte.

11. A method of manufacturing a negative electrode, the method comprising:

milling a non-carbonaceous material and carbon nanotubes (CNTs), in an organic solvent, to prepare a mixture,

adding carbonizable monomers and a polymerization catalyst to the mixture, to prepare polymer nanoparticles, and

carbonizing the polymer nanoparticles, to produce a composite material;

mixing the composite material, a binder, and a solvent, to prepare a negative active material composition; and

coating and drying the negative active material composition on a collector.

12. The method of claim 11, wherein the mixing is performed from about 50 Hz to about 60 Hz.

13. The method of claim 11, wherein the mixing is performed for from about 1 hour to about 2 hours.

14. The method of claim 11, wherein the polymer nanoparticles are formed by an emulsion polymerization, in which the carbonizable monomers form micelles, to form a polymer.

15. The method of claim 11, wherein the organic solvent comprises an alcohol or an alkane.

16. A negative active material comprising a composite comprising:

particles of a silicon-based material;

carbon nanotubes (CNTs) attached to the silicon-based material, and

carbon nanoparticles coated on the CNTs and the silicon-based material.

17. The negative active material of claim 16, wherein the average size of the particles of the silicon-based material is in a range of from about 10 nm to about 50 nm.

18. The negative active material of claim 16, wherein the weight ratio of the silicon-based material to the CNTs is in a range of from about 5:

1 to about 20;

1.

19. The negative active material of claim 16, further comprising a binder, wherein the amount of the composite was 90 weight % (65 weight % of the silicon-based material, 7 weight % of the CNTs, and 18 weight % of the carbon nanoparticles), and the amount of the binder was 10 weight %, based on the total weight of the negative active material.

20. The negative active material of claim 16, wherein the silicon-based material comprises at least one material selected from the group consisting of Si, silicon oxide (SiO_x where 0<

x<

2), Si—

Y, and a mixture thereof, wherein Y is selected from the group consisting of As, Sb, Bi, Cu, Ni, Mg, In, Zn, Ag, Al, and a combination thereof.