NEGATIVE ELECTRODE COMPOSITION, AND NEGATIVE ELECTRODE AND LITHIUM BATTERY CONTAINING THE SAME

• US 20150303456A1
• Filed: 02/11/2015
• Published: 10/22/2015
• Est. Priority Date: 04/18/2014
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: YOO, Ha-Na, HAN, Man-Seok, WON, Jung-Yeon, LEE, So-Ra, KIM, Myung-Hoon, KIM, Seung-Wan
• Granted Patent: US 9,774,031 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• CPC Class Codes: H01M 4/387 Tin or alloys based on tin
• CPC Class Codes: H01M 4/40 Alloys based on alkali metals
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Provided are a composition for a negative electrode, and a negative electrode and lithium battery including the composition. The composition includes a negative active material that contains one or more of a metal or a metalloid, an acrylate-based binder, and a guanidine carbonate.

Claims

1. A composition for a negative electrode, the composition comprising:

a negative active material that contains one or more of a metal or a metalloid,

an acrylate-based binder, and

guanidine carbonate.

2. The composition as claimed in claim 1, wherein the guanidine carbonate is present in an amount of about 3 parts by weight or more based on 100 parts by weight of the acrylate-based binder.

3. The composition as claimed in claim 1, wherein the guanidine carbonate is present in an amount of about 3 to about 30 parts by weight based on 100 parts by weight of the acrylate-based binder.

4. The composition as claimed in claim 1, wherein the acrylate-based binder includes lithium polyacrylate.

5. The composition as claimed in claim 4, wherein:

the lithium polyacrylate is a lithium salt of polyacrylic acid that includes an ethylenically unsaturated carboxylic acid as a monomer repeating unit, and

the ethylenically unsaturated carboxylic acid is acrylic acid, methacrylic acid, itaconic acid, fumaric acid, chrotonic acid, maleic acid, maleic anhydride, mesaconic acid, glutaconic acid, a derivative thereof, or a combination thereof.

6. The composition as claimed in claim 1, wherein the acrylate-based binder is present in an amount of about 2 to about 10 wt % based on a total weight of the composition.

7. The composition as claimed in claim 1, wherein the acrylate-based binder is present in an amount of about 4 to about 8 wt % based on a total weight of the composition.

8. The composition as claimed in claim 1, wherein the negative active material includes at least one metal or metalloid element selected from a Group 13 element, a Group 14 element, and a Group 15 element.

9. The composition as claimed in claim 1, wherein the negative active material includes at least one metal or metalloid element selected from Si, Ge, and Sn.

10. The composition as claimed in claim 1, wherein the negative active material includes a Si—

Z alloy, wherein Z is an alkali metal, an alkali earth-metal, a Group 11 element, a Group 12 element, a Group 13 element, a Group 14 element, a Group 15 element, a Group 16 element, a transition metal, a rare-earth element, or a combination thereof, with the proviso that Z is not Si.

11. The composition as claimed in claim 10, wherein the Z is selected from Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Nb, Ba, Lu, Hf, Ta, a lanthanum element, or a combination thereof.

12. The composition as claimed in claim 10, wherein the Si—

Z alloy is represented by Si-M′

-M″

, wherein M′

is Al, Ti, or Fe, and M″

is Ni, Fe, or Mn.

13. The composition as claimed in claim 1, wherein the negative active material is in at least one form selected from a nanoparticle, a nanowire, a nanotube, a nanobelt, a nanorod, a nano porous structure and a nanotemplate.

14. The composition as claimed in claim 1, wherein the negative active material is in a form of a nanoparticle.

15. The composition as claimed in claim 1, wherein the composition further includes a carbonaceous negative active material.

16. The composition as claimed in claim 15, wherein the carbonaceous negative active material is blended with the negative active material by mixing, or the carbonaceous negative active material is coated on a surface of the negative active material.

17. A negative electrode, comprising the composition as claimed in claim 1.

18. A lithium battery, comprising the negative electrode as claimed in claim 17.