Carbon nanotube array bonding

Patent metadata

Field	Value
Publication number	US-11569509-B2
Application number	US-202117305757-A
Country	US
Kind code	B2
Filing date	Jul 14, 2021
Priority date	Jun 15, 2011
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

Material compositions are provided that may comprise, for example, a vertically aligned carbon nanotube (VACNT) array, a conductive layer, and a carbon interlayer coupling the VACNT array to the conductive layer. Methods of manufacturing are provided. Such methods may comprise, for example, providing a VACNT array, providing a conductive layer, and bonding the VACNT array to the conductive layer via a carbon interlayer.

First claim

The invention claimed is:

1. A battery electrode, comprising:
an active material coating comprising at least one battery electrode active material and carbon nanotubes, the at least one battery electrode active material comprising a first battery electrode active material that comprises silicon;
a metal-comprising, electrically conductive current collector; and
an electrically conductive, carbon-comprising or polymer-comprising interlayer separate from the active material coating and coupling the active material coating to the electrically conductive current collector.

2. The battery electrode of claim 1 , wherein the at least one battery electrode active material further comprises a second battery electrode active material.

3. The battery electrode of claim 2 , wherein the second battery electrode active material comprises carbon.

4. The battery electrode of claim 1 , wherein at least some of the carbon nanotubes extend from an inner surface of the active material coating to an outer surface of the active material coating.

5. The battery electrode of claim 1 , wherein the average thickness of the electrically conductive, carbon-comprising or polymer-comprising interlayer exceeds 50 nm.

6. The battery electrode of claim 1 , wherein the battery electrode active material comprises an outer coating layer.

7. The battery electrode of claim 6 , wherein the outer coating layer comprises multiple layers.

8. The battery electrode of claim 6 , wherein the outer coating layer comprises carbon.

9. The battery electrode of claim 6 , wherein the outer coating layer comprises a metal oxide.

10. The battery electrode of claim 6 , wherein the outer coating layer comprises a metal halide.

11. The battery electrode of claim 6 , wherein the active material coating comprises one or more pores to at least partially accommodate expansion of the silicon during battery operation.

12. The battery electrode of claim 1 , wherein the at least one battery electrode active material is in contact with the carbon nanotubes.

13. The battery electrode of claim 1 , wherein the battery electrode exhibits a thermal conductivity greater than about 400 W/(m·K) in a direction perpendicular to the electrode plane.

14. The battery electrode of claim 1 , wherein the carbon nanotubes are arranged as a vertically aligned carbon nanotube (VACNT) array.

15. The battery electrode of claim 1 , wherein the current collector comprises copper.

16. The battery electrode of claim 1 , wherein the current collector comprises nickel.

17. The battery electrode of claim 1 , wherein the electrically conductive, carbon-comprising or polymer-comprising interlayer comprises polyvinylidene difluoride (PVDF).

18. The battery electrode of claim 1 , wherein the electrically conductive, carbon-comprising or polymer-comprising interlayer comprises graphitic (sp2-bonded) carbon.

19. The battery electrode of claim 1 , wherein the electrically conductive, carbon-comprising or polymer-comprising interlayer is heated to above 100° C. during formation of the electrically conductive, carbon-comprising or polymer-comprising interlayer.

20. A Li-ion battery, comprising:
the battery electrode of claim 1 .

Assignees

• Georgia Tech Res Inst

Inventors

• Yushin Gleb Nikolayevich
• Evanoff Kara Linn

Classifications

• C01B32/168

  After-treatment · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y10S977/948

  Energy storage/generating using nanostructure, e.g. fuel cell, battery · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• Y10S977/742

  Carbon nanotubes, CNTs · CPC title