Silicon oxide-carbon composite, method of manufacturing the composite, and energy storage device having the composite

Patent metadata

Field	Value
Publication number	US-9985279-B2
Application number	US-201514618982-A
Country	US
Kind code	B2
Filing date	Feb 10, 2015
Priority date	Feb 10, 2014
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

Provided are a silicon oxide-carbon composite, a method of preparing the same, and an energy storage device containing the same. In the method of preparing a silicon oxide-carbon composite, a reaction solution containing an organic solvent including an aromatic compound is provided. Crystalline carbon structures are formed by generating plasma in the reaction solution. A slurry is formed by adding silicon halide and a polyol in the reaction solution in which the crystalline carbon structures are dispersed. The slurry is separated from the organic solvent and subjected to thermal treatment.

First claim

What is claimed is:

1. A silicon oxide-carbon composite, comprising:
a matrix comprising amorphous silicon oxide and amorphous carbon that are randomly dispersed and mixed together in the matrix;
silicon metal crystals dispersed in the matrix; and
carbon structures dispersed in the matrix, the carbon structures comprising a laminar graphite crystal structure.

2. The composite according to claim 1 , wherein the amorphous silicon oxide is SiO x (1<x<2).

3. The composite according to claim 1 , wherein the contents of the amorphous carbon and the crystalline carbon structures are 60 to 90 wt. %.

4. The composite according to claim 1 , wherein, in a graph obtained by X-ray photoelectron spectroscopy for the silicon oxide-carbon composite, a combined intensity of a peak representing an Si—O—C bond and a peak representing an Si—C bond is higher than that of a peak representing an SiO 2 bond.

5. The composite according to claim 1 , wherein the carbon structures have a linear or curved laminar graphite crystal structure.

6. The composite according to claim 1 , wherein the carbon structures have pores therein.

7. The composite according to claim 1 , which is a random-shaped particle.

8. An energy storage device comprising:
a first electrode including the silicon oxide-carbon composite according to claim 1 ;
a second electrode; and
an electrolyte disposed between the first electrode and the second electrode.

Assignees

• Industry Academia Cooperation Group Of Sejong Univ
• Ind Academia Cooperation Group Of Sejong Univ

Inventors

• Kim Sun Jae
• Jung Hee June
• Yun Kang Seop
• Noh Eul

Classifications

• H01M4/625

  Carbon or graphite · CPC title

• C01B31/02

  Chemistry & Metallurgy · mapped topic

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01B1/18

  the conductive material comprising carbon-silicon compounds, carbon or silicon · CPC title