ELECTRODE MATERIAL HAVING A HIGH CAPACITY

• US 20130337334A1
• Filed: 01/27/2012
• Published: 12/19/2013
• Est. Priority Date: 02/23/2011
• Status: Abandoned Application

• Current Assignee: Evonik Litarion GmbH (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Evonik Litarion GmbH (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Miessen, Martin, Pilgram, Peter, Winter, Martin, Tao, Chuanqi, Passerini, Stefano
• Application Number:
  US14/000,877
• Publication Number:
  US 20130337334A1
• Time in Patent Office: Days
• US Class Current: 429/231.8
• CPC Class Codes: C01B 21/068 with silicon
• 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 4/04 Processes of manufacture in general
• 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 4/1393 of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/1395 of electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/49115 including coating or impregnating

Abstract

The invention accordingly provides a silicon-carbon composite which has at least a proportion of hard carbon and a proportion of silicon powder and is obtained by, under a noble gas atmosphere, a) treating the hard carbon component at least once with high energy in a mechanofusion mixer and b) subsequently adding the silicon powder component thereto and mixing the components, or adding the silicon powder component during step a) and continuing the mechanofusion treatment, and is characterized in that the composite has an average particle size of less than or equal to 12 μm, a proportion of hard carbon of from 5 to 50% by weight and a proportion of silicon powder of from 5 to 50% by weight.

Claims

1. A silicon-carbon composite, comprising:

from 5 to 50% by weight of hard carbon and

from 5 to 50% by weight of silicon powder,

wherein the silicon-carbon composite is obtained under a noble gas atmosphere by a process comprising;

treating the hard carbon at least once with high energy in a mechanofusion mixer and

subsequently adding the silicon powder thereto and mixing the hard carbon and the silicon powder, or adding the silicon powder during the treating and continuing the treating, and

wherein the silicon-carbon composite has an average particle size of less than or equal to 12 μ

m.

2. The silicon-carbon composite according to claim 1,

wherein the noble gas atmosphere is argon.

3. The silicon-carbon composite according to claim 1,

wherein the silicon powder is added after the treating and the treating is continued.

4. A method for producing a lithium-ion battery, comprising:

producing the lithium-ion battery with the silicon-carbon composite according to claim 1, as an active component,

wherein the silicon-carbon composite is processed together with a conductivity increaser and a binder to give a paste to be applied to a power outlet lead.

5. A lithium ion battery, comprising

the silicon-carbon composite according to claim 1.

6. The lithium ion battery according to claim 5,

wherein the silicon-carbon composite is processed together with a conductivity increaser and a binder to give a paste to be applied to a power outlet lead.