Electrode materials with a synthetic solid electrolyte interface

Patent metadata

Field	Value
Publication number	US-9685678-B2
Application number	US-201414765808-A
Country	US
Kind code	B2
Filing date	Feb 4, 2014
Priority date	Feb 5, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A material suitable for use in an electrode, preferably an anode, and processes of its formation are provided. The material includes an electrode base material and an organic artificial solid electrolyte interface material including a water soluble organic polymer coating the electrode base material. The polymer is polymerized with a crosslinker to form the organic artificial solid electrolyte interface material. The resulting artificial SEI coated electrode material demonstrates superior discharge rate capacity and cycle stability.

First claim

The Invention claimed is:

1. An electrode material comprising:
an electrode base material; and
an organic artificial solid electrolyte interface material comprising a water soluble organic polymer;
said artificial solid electrolyte interface material forming a cross-linked polymeric coating, said coating polymerized upon said electrode base material,
said polymeric coating formed prior to combining said electrode base material with a binder or a current collector.

2. The electrode material of claim 1 , wherein said artificial solid electrolyte interface material further comprises a crosslinker.

3. The electrode material of claim 2 , wherein said crosslinker comprises a metal ion or Lewis base.

4. The electrode material of claim 3 , wherein said metal ion is boron, chromium, titanium, zirconium, or antimony.

5. The electrode material of claim 2 , wherein said crosslinker is lithium tetraborate.

6. The electrode material of claim 2 , wherein said water soluble organic polymer and said crosslinker are in a ratio of 4:1 to 1:1 respectively.

7. The electrode material of claim 1 , wherein said organic artificial solid electrolyte interface material further includes or is capable of absorbing an electrolyte solvent,optionally a carbonate electrolyte solvent.

8. The electrode material of claim 1 , wherein said water soluble organic polymer is PAA, PVA, or PMMA.

9. The electrode material of claim 1 , wherein said artificial solid electrolyte interface material is present on said electrode base material at 0.05 percent to 5 percent total weight of said electrode material.

10. The electrode material of claim 1 , wherein said electrode base material comprises a lithium inserting material.

11. The electrode material of claim 1 , wherein said electrode material comprises silicon, graphitic carbon, a silicon/graphitic carbon composite, or combinations thereof.

12. The electrode material of claim 11 , wherein said electrode base material is a silicon composite of silicon and graphitic carbon.

13. The electrode material of claim 1 , wherein said electrode base material is a silicon-graphitic carbon composite nanowire.

14. The electrode material of claim 13 , wherein said nanowire is coated with carbon intermediate between said nanowire and said artificial solid electrolyte interface material.

15. The electrode material of claim 1 , wherein said electrode base material is suitable for use as an anode in an electrochemical cell.

16. A process for making an electrode for an electrochemical device, said process comprising the steps of:
providing an electrode base material;
combining said electrode base material with a polymer and a crosslinker in an aqueous solution at a ratio of polymer to crosslinker; and
polymerizing said polymer and said crosslinker to form a polymeric artificial solid electrolyte interface material upon said electrode base material,
said polymeric artificial solid electrolyte interface material formed prior to combining said electrode base material with a binder or a current collector.

17. The process of claim 16 , wherein said step of polymerizing is at a temperature of 30 degrees Celsius to 70 degrees Celsius.

18. The process of claim 16 , wherein said step of polymerizing is at a temperature of 50 degrees Celsius.

19. The process of claim 16 , wherein said step of polymerizing is for polymerization time of 5 minutes to 30 minutes.

20. The process of claim 19 , wherein said polymerization time is 15 minutes.

21. The process of claim 16 , wherein said polymer and said Cross linker are in a ratio of 4:1 to 1:1 respectively.

22. The process of claim 16 , wherein said electrode base material is a silicon composite of silicon and graphitic carbon.

23. The process of claim 16 , wherein said electrode base material is a silicon-graphitic carbon composite nanowire.

24. The process of claim 23 , wherein said nanowire is coated with carbon intermediate between said electrode base material and said artificial solid electrolyte interface material.

25. A battery comprising:
an electrode material comprising an electrode base material together with an organic artificial solid electrolyte interface, the organic artificial solid electrolyte interface coated over the electrode base material to form a cross-linked polymeric coating prior to combining said electrode base material with a binder or a current collector;
an electrolyte; and
a container housing both said electrode material and said electrolyte.

26. The battery of claim 25 , wherein said electrolyte is a carbonate electrolyte.

27. The battery of claim 25 , further comprising an anode formed from the electrode material.

Assignees

• A123 Systems Llc

Inventors

• Vu Viet
• Shi Jinjun
• Zhang Pu

Classifications

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M2300/0082

  Organic polymers · CPC title