Method for making lithium ion battery electrode

Patent metadata

Field	Value
Publication number	US-9537141-B2
Application number	US-201213662768-A
Country	US
Kind code	B2
Filing date	Oct 29, 2012
Priority date	Jul 13, 2012
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A method for making a lithium ion battery electrode is provided. A support having a support surface is provided. A graphene layer is formed on the support surface of the support. An electrode material layer is applied on an exposed surface of the graphene layer. The graphene layer is located between the electrode material layer and the support.

First claim

What is claimed is:

1. A method for making a lithium ion battery electrode comprising:
providing a support comprising a support surface;
forming a graphene layer on the support surface of the support, wherein the graphene layer is formed on the support by steps of:
forming an oxide layer on the support surface of the support using plasma;
providing a highly oriented pyrolytic graphite having a cleavage surface, wherein the cleavage surface is in contact with the oxide layer;
applying a pressure on the highly oriented pyrolytic graphite and the support; and
removing the highly oriented pyrolytic graphite from the support, thereby forming the graphene layer on the oxide layer of the support; and

applying an electrode material layer on an exposed surface of the graphene layer, wherein the graphene layer is located between the electrode material layer and the support, and the electrode material layer consists of a plurality of electrode active material particles and a plurality of carbon nanotubes wrapped around the plurality of electrode active material particles.

2. The method of claim 1 , wherein the electrode material layer is made by the steps of:
providing the plurality of electrode active material particles, a carbon nanotube source comprising the plurality of carbon nanotubes, and a solvent;
adding the carbon nanotube source and the plurality of electrode active material particles into the solvent, and agitating the solvent with the carbon nanotube source and the plurality of electrode active material particles; and
separating the carbon nanotube source and the plurality of electrode active material particles from the solvent to obtain the electrode material layer.

3. The method of claim 2 , wherein the carbon nanotube source is made by: providing a substrate and a carbon nanotube array formed on the substrate; and scratching the carbon nanotube array from the substrate to form the carbon nanotube source.

4. The method of claim 2 , wherein the solvent is ethanol, glycol, acetone, N-Methyl-2-pyrrolidone, water, or combination thereof.

5. The method of claim 2 , wherein the solvent is agitated with ultrasonic waves.

6. The method of claim 5 , wherein a power of the ultrasonic waves is in a range from about 400 W to about 1500 W.

7. The method of claim 5 , wherein the solvent is agitated for about 2 minutes to about 5 minutes.

8. The method of claim 1 , wherein before applying the pressure on the highly oriented pyrolytic graphite, the highly oriented pyrolytic graphite and the support are closely clipped in a clamp to be conveniently pressed.

9. The method of claim 8 , wherein the pressure is applied by a pressure force in a range from about 100 N to about 200 N.

10. The method of claim 9 , wherein the pressure is applied for about 5 minutes to about 10 minutes.

11. The method of claim 1 , wherein the method of forming the graphene layer is carried out in a sterilized room.

12. The method of claim 1 , wherein the plurality of electrode active material particles is selected from the group consisting of natural graphite, pyrolysis carbon, and mesocarbon microbeads (MCMB).

13. The method of claim 1 , wherein the plurality of electrode active material particles is selected from the group consisting of lithium manganate (LiMn 2 O 4 ), lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ), and lithium iron phosphate (LiFePO 4 ).

14. A method for making a lithium ion battery electrode comprising:
providing a support comprising a support surface;
forming a graphene layer on the support surface of the support, wherein the graphene layer is formed on the support by steps of:
forming an oxide layer on the support surface of the support using plasma;
providing a highly oriented pyrolytic graphite having a cleavage surface, wherein the cleavage surface is in contact with the oxide layer;
applying a pressure on the highly oriented pyrolytic graphite and the support; and
removing the highly oriented pyrolytic graphite from the support, thereby forming the graphene layer on the oxide layer of the support; and

applying an electrode material layer on an exposed surface of the graphene layer, wherein the graphene layer is located between the electrode material layer and the support, the electrode material layer consists of a plurality of electrode active material particles and a plurality of carbon nanotubes wrapped around the plurality of electrode active material particles, and the plurality of electrode active material particles is a cathode active material selected from the group consisting of lithium manganate (LiMn 2 O 4 ), lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ), and lithium iron phosphate (LiFePO 4 ).

Assignees

• Wang Jia-Ping
• Jiang Kai-Li
• Fan Shou-Shan
• Univ Tsinghua
• Hon Hai Prec Ind Co Ltd

Inventors

• Wang Jia-Ping
• Jiang Kai-Li
• Fan Shou-Shan

Classifications

• H01M4/139 Primary

  Processes of manufacture · CPC title

• Y10T29/49115

  including coating or impregnating · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• Y02P70/54

  Cross-Sectional Technologies · mapped topic