Composition of SI/C electro active material

Patent metadata

Field	Value
Publication number	US-9548489-B2
Application number	US-201314371837-A
Country	US
Kind code	B2
Filing date	Jan 29, 2013
Priority date	Jan 30, 2012
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A composition comprising at least 50 weight % of a first particulate electroactive material and 3-15 weight % of a carbon additives mixture comprising elongate carbon nanostructures and carbon black, wherein: the elongate carbon nanostructures comprise at least a first elongate carbon nanostructure material and a different second elongate carbon nanostructure material; and the elongate carbon nanostructures: carbon black weight ratio is in the range 3:1 to 20:1.

First claim

The invention claimed is:

1. A composition comprising at least 50 weight % of a first particulate electroactive material comprising silicon, 2-25 weight % of elongate carbon nanostructures and at least 0.25 weight % of carbon black, wherein:
the elongate carbon nanostructures comprise at least a first elongate carbon nanostructure material and a different second elongate carbon nanostructure material; and
an elongate carbon nanostructures: carbon black weight ratio is in a range of 3:1 to 20:1.

2. The composition according to claim 1 , wherein the first particulate electroactive material comprises particles having a particle core and electroactive pillars extending from the particle core.

3. The composition according to claim 2 , wherein the particles are silicon-comprising particles and the pillars of the silicon-comprising particles are silicon pillars.

4. The composition according to claim 3 , wherein the core of the silicon-comprising particles comprises silicon.

5. The composition according to claim 2 , wherein the particles are silicon-comprising particles and the silicon-comprising particles consist essentially of n- or p-doped silicon and wherein the pillars are integral with the core.

6. The composition according to claim 1 , wherein the first elongate nanostructure has a mean average diameter of at least 100 nm.

7. The composition according to claim 1 , wherein the second elongate carbon nanostructure material has a mean average diameter of no more than 90 nm.

8. The composition according to claim 1 , wherein a first elongate nanostructure: second elongate nanostructure weight ratio is in a range of 2.5:1 to 20:1.

9. The composition according to claim 1 , wherein the at least first and second elongate carbon nanostructures each independently has an aspect ratio of at least 50.

10. The composition according to claim 1 , wherein the first and second carbon elongate nanostructure materials are each independently selected from carbon nanotubes and carbon nanofibres.

11. The composition according to claim 10 , wherein the first carbon elongate nanostructure material is a nanofibre and the second elongate carbon nanostructure material is a nanotube.

12. The composition according to claim 1 , wherein the at least first and second elongate carbon nanostructure materials are provided in a total amount in a range of 3-13 weight % of the composition.

13. The composition according to claim 1 , wherein one or more of the elongate carbon nanostructure materials has a functionalised surface.

14. The composition according to claim 1 , wherein the composition further comprises graphite.

15. The composition according to claim 14 , wherein the graphite is provided in the composition in an amount of 1-30 wt %.

16. The composition according to claim 15 , wherein a crystallite length Lc of the graphite is at least 50 nm.

17. The composition according to claim 1 , wherein the carbon black is provided in an amount of at least 0.5 weight % of the composition.

18. A metal-ion battery comprising an anode, a cathode and an electrolyte between the anode and the cathode wherein the anode comprises a composition according to claim 1 .

19. A method of forming an anode for a metal-ion battery, the method comprising steps of:
depositing a slurry comprising at least one solvent and the composition according to claim 1 onto a conductive material; and
evaporating the at least one solvent.

Assignees

• Nexeon Ltd
• Nexeon Ltd

Inventors

• Abdelsalam Mamdouh Elsayed
• Coowar Fazil

Classifications

• H01M4/364

  as mixtures · CPC title

• H01M4/1395

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

• H01M4/366 Primary

  as layered products · CPC title

• C01B2202/36

  Diameter · CPC title

• H01M4/625

  Carbon or graphite · CPC title