Carbon-silicon composite and manufacturing mehtod of the same

Patent metadata

Field	Value
Publication number	US-2016006019-A1
Application number	US-201514788797-A
Country	US
Kind code	A1
Filing date	Jul 1, 2015
Priority date	Jul 3, 2014
Publication date	Jan 7, 2016
Grant date	—

Abstract

Disclosed herein are a manufacturing method of a carbon-silicon composite, comprising: (a) preparing a silicon-polymer matrix slurry comprising a silicon slurry, a monomer, and a cross-linking agent; (b) performing a heat treatment on the silicon-polymer matrix slurry to manufacture a silicon-polymer carbonized matrix; (c) pulverizing the silicon-polymer carbonized matrix to manufacture silicon-polymer carbonized particles; and (d) mixing the silicon-polymer carbonized particles with a first carbon raw material, and then performing a carbonization process, the carbon-silicon composite, an anode for a secondary battery manufactured by applying the carbon-silicon composite, and a secondary battery comprising the anode for a secondary battery.

First claim

1 . A manufacturing method of a carbon-silicon composite, comprising:
(a) preparing a silicon-polymer matrix slurry from mixture comprising a silicon slurry, a monomer, and a cross-linking agent; (b) performing a heat treatment on the silicon-polymer matrix slurry to manufacture a silicon-polymer carbonized matrix; (c) pulverizing the silicon-polymer carbonized matrix to manufacture silicon-polymer carbonized particles; and (d) mixing the silicon-polymer carbonized particles with a first carbon raw material, and then performing a carbonization process.

2 . The manufacturing method of claim 1 , wherein when it is assumed that a particle diameter at 50% cumulative mass particle size distribution is D50, silicon (Si) in the silicon-polymer matrix slurry in (a) satisfies 2 nm<D50<180 nm.

3 . The manufacturing method of claim 1 , wherein the monomer in (a) is at least one selected from the group consisting of acrylic add, acrylate, methyl methacrylic add, methyl methacrylate, acryamide, vinyl acetate, maleic add, styrene, acrylonitrile, phenol, ethylene glycol, lauryl methacrylate, and vinyl difluoride.

4 . The manufacturing method of claim 1 , wherein the cross-linking agent in (a) is at least one selected from the group consisting of ethylene glycol dimethacrylate, ethylene glycol diacrylate, diethylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, N,N-methylenebisacrylamide, N,N-(1,2-dihydroxyethylene)bisacrylamide, and divinylbenzene.

5 . The manufacturing method of claim 1 , wherein the silicon slurry, the monomer, and the cross-linking agent in (a) have a weight ratio of 10:5˜10:1˜5.

6 . The manufacturing method of claim 1 , wherein the heat treatment in (b) is performed under an atmospheric pressure at 300° C. to 500° C. for 0.5 to 5 hours.

7 . The manufacturing method of claim 1 , wherein the silicon-polymer carbonized matrix in (b) has a polymer network structure formed by cross-linking between monomers.

8 . The manufacturing method of claim 1 , wherein the first carbon raw material in (d) comprises at least one selected from the group consisting of natural graphite, artificial graphite, soft carbon, hard carbon, pitch, calcined coke, graphene, carbon nanotube, and combinations thereof.

9 . The manufacturing method of claim 1 , further comprising:
(e) mixing the carbon-silicon composite with a second carbon raw material, and then performing a carbonization process.

10 . The manufacturing method of claim 9 , wherein the second carbon raw material in (e) comprises at least one selected from the group consisting of natural graphite, artificial graphite, soft carbon, hard carbon, pitch, calcined coke, graphene, carbon nanotube, and combinations thereof.

11 . A carbon-silicon composite comprising:
silicon-polymer carbonized particles formed from a silicon-polymer matrix slurry comprising a silicon slurry, a monomer, and a cross-linking agent; and a first carbon matrix, wherein the silicon-polymer carbonized particles are captured and dispersed in the first carbon matrix.

12 . The carbon-silicon composite of claim 11 , wherein a mass ratio of silicon (Si) to carbon (C) is 1:99 to 10:90.

13 . The carbon-silicon composite of claim 11 , wherein the silicon-polymer carbonized particle has a porosity higher than that of the first carbon matrix.

14 . The carbon-silicon composite of claim 11 , wherein the first carbon matrix comprises at least one selected from the group consisting of natural graphite, artificial graphite, soft carbon, hard carbon, pitch carbide, calcined coke, graphene, carbon nanotube, and combinations thereof.

15 . The carbon-silicon composite of claim 11 , further comprising:
second carbon particles.

16 . The carbon-silicon composite of claim 15 , wherein the second carbon particle comprises at least one selected from the group consisting of natural graphite, artificial graphite, soft carbon, hard carbon, pitch carbide, calcined coke, graphene, carbon nanotube, and combinations thereof.

17 . An anode for a secondary battery manufactured by coating an anode slurry on an anode current collector, the anode slurry comprising: the carbon-silicon composite of claim 11 ; a conductive material; a binder; and a thickening agent.

18 . A secondary battery comprising the anode for a secondary battery of claim 17 .

Assignees

• Oci Co Ltd

Inventors

• Jung Sung-Ho
• Kim Yo-Seop
• Jeong Eun-Hye
• Ha Jeong-Hyun

Classifications

• H01M4/0471 Primary

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title