Anode active material for lithium secondary battery, method of preparing the same, and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2016006027-A1
Application number	US-201414771041-A
Country	US
Kind code	A1
Filing date	May 7, 2014
Priority date	May 7, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

Disclosed herein is a non-carbon-based anode active material for lithium secondary batteries, including: a core containing silicon (Si); and silicon nanoparticles formed on the surface of the core. The non-carbon-based anode active material is advantageus in that the increase in the volume expansion during charging-discharging can be prevented by the application of silicon nanoparticles, and in that SiOx(x<1.0) can be easily prepared.

First claim

What is claimed is:

1 . A non-carbon-based anode active material for lithium secondary batteries, comprising:
a core containing silicon (Si); and silicon nanoparticles formed on the surface of the core.

2 . The non-carbon-based anode active material of claim 1 , wherein the silicon nanoparticles are included in an amount of 20 to 200 parts by weight, based on 100 parts by weight of the core.

3 . The non-carbon-based anode active material of claim 1 , wherein the silicon nanoparticles are included in an amount of 50 to 100 parts by weight, based on 100 parts by weight of the core.

4 . The non-carbon-based anode active material of claim 1 , wherein the silicon nanoparticles have a particle diameter of 5 to 100 nm.

5 . The non-carbon-based anode active material of claim 4 , wherein the silicon nanoparticles have a particle diameter of 20 to 80 nm.

6 . The non-carbon-based anode active material of claim 1 , wherein the core has a particle diameter of 1 to 30 μm.

7 . The non-carbon-based anode active material of claim 6 , wherein the core has a particle diameter of 3 to 10 μm.

8 . The non-carbon-based anode active material of claim 1 , further comprising a coating layer formed on the surface of the core and containing carbon (C).

9 . The non-carbon-based anode active material of claim 8 , wherein the coating layer is included in an amount of 5 to 70 wt %, based on a total amount of the anode active material.

10 . The non-carbon-based anode active material of claim 1 , wherein the core is made of SiOx (0<x<1).

11 . The non-carbon-based anode active material of claim 10 , wherein the core is made of SiO.

12 . The non-carbon-based anode active material of claim 10 , wherein the SiOx (0<x<1) is amorphous.

13 . A method of preparing a non-carbon-based anode active material for lithium secondary batteries, comprising the steps of:
preparing a core containing silicon (Si); and mixing silicon nanoparticles with the core to attach the silicon nanoparticles to the surface of the core.

14 . The method of claim 13 , wherein the silicon nanoparticles and the core are mixed by ball milling or planetary ball mill.

15 . The method of claim 13 , wherein the silicon nanoparticles and the core are mixed by dispersing the silicon nanoparticles using a dispersant and then stirring the dispersed silicon nanoparticles and the core in a solvent.

16 . The method of claim 13 , further comprising the step of forming a coating layer containing carbon on the surface of the core attached with the silicon nanoparticles.

17 . The method of claim 15 , wherein the dispersant is included in an amount of 2 to 10 wt % based on the amount of the mixed solution of the silicon nanoparticles and the core.

18 . The method of claim 16 , wherein the coating layer is formed by chemical vapor deposition (CVD) or pitch coating.

19 . A lithium secondary battery, comprising:
an anode including the anode active material of any one of claims 1 ; a cathode including a cathode active material; and an electrolyte.

Assignees

• Lg Chemical Ltd
• Lg Chemical Ltd

Inventors

• Kim Je-Young
• Kim Hyun-Chul
• Lee Yong-Ju

Classifications

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/04

  Processes of manufacture in general · CPC title

• H01M4/583

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

• H01M4/0428

  Chemical vapour deposition · CPC title