Silicon carbon composite, negative electrode active material, negative electrode composition, negative electrode, and secondary battery

Abstract

The present invention relates to a silicon-carbon composite having peak A in the range of 130 ppm to 150 ppm, peak B in the range of 110 ppm to 130 ppm, and peak C in the range of 15 ppm to 40 ppm when analyzed by 13C-NMR, and satisfying the following formula 1, as well as a negative electrode active material, negative electrode composition, negative electrode, lithium secondary battery, battery module, and battery pack containing the same. [Formula 1] 0.3 ≤ Intensity of Peak C / (Intensity of Peak A + Intensity of Peak B) ≤ 2.1

Claims

1. A silicon-carbon composite having peak A in the range of 130 ppm to 150 ppm, peak B in the range of 110 ppm to 130 ppm, and peak C in the range of 15 ppm to 40 ppm during 13C-NMR analysis, and satisfying the following formula 1: [Formula 1] 0.3 ≤ Intensity of Peak C / (Intensity of Peak A + Intensity of Peak B) ≤ 2.1 The intensity of peak A is the sum of the peak areas of peak A and the spinning side bands derived from peak A. The intensity of peak B is the sum of the areas of peak B and the spinning side bands derived from peak B. The intensity of peak C is the sum of the peak areas of peak C and the spinning sidebands derived from peak C.

2. The silicon-carbon composite according to claim 1, wherein peak A is located in the range of 135 ppm to 145 ppm, peak B is located in the range of 120 ppm to 125 ppm, and peak C is located in the range of 23 ppm to 27 ppm.

3. The silicon-carbon composite according to claim 1, wherein the silicon-carbon composite comprises porous carbon-based particles and particles having silicon provided in at least a portion of the interior and surface of the porous carbon-based particles; or porous silicon-based particles and particles having carbon provided in at least a portion of the interior and surface of the porous silicon-based particles.

4. The silicon-carbon composite is SiO ｘ C ｙ The silicon-carbon composite according to claim 1, represented by (x = 0 to 0.5, y = 1.0 to 3.0).

5. A negative electrode active material comprising the silicon-carbon composite according to any one of claims 1 to 4.

6. A negative electrode composition comprising a negative electrode active material; a binder; and a conductive material according to claim 5.

7. The negative electrode composition according to claim 6, wherein the negative electrode active material further comprises a carbon-based active material.

8. The negative electrode composition according to claim 7, wherein the silicon-carbon composite is included in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the negative electrode active material.

9. The negative electrode composition according to claim 7, wherein the carbon-based active material comprises at least one of artificial graphite and natural graphite.

10. A negative electrode comprising the negative electrode composition described in claim 6.

11. A lithium secondary battery comprising the negative electrode, positive electrode, and separator described in claim 10.

12. A battery module comprising the lithium secondary battery described in claim 11.

13. A battery pack comprising the lithium secondary battery described in claim 11.

14. A battery pack comprising the battery module described in claim 12.

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