Method and system for silosilazanes, silosiloxanes, and siloxanes as additives for silicon dominant anodes

Patent metadata

Field	Value
Publication number	US-11043676-B1
Application number	US-201916705085-A
Country	US
Kind code	B1
Filing date	Dec 5, 2019
Priority date	Dec 5, 2019
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

Systems and methods for silosilazanes, silosiloxanes, and siloxanes as additives for silicon-dominant anodes in a battery that may include a cathode, an electrolyte, and an anode active material. The active material may comprise 50% or more silicon as well as an additive including one or more of: silosilazane, silicon oxycarbides, and polyorganosiloxane. The silosilazane may comprise one or more amine groups, silanols, silyl ethers, sylil chlorides, dialkylamoinosilanes, silyl hydrides, and cyclic azasilanes. The active material may comprise a film with a thickness between 10 and 80 microns. The film may have a conductivity of 1 S/cm or more. The active material may comprise between 50% and 95% silicon. The active material may be held together by a pyrolyzed carbon film. The anode may comprise lithium, sodium, potassium, silicon, and/or mixtures and combinations thereof. The battery may comprise a lithium ion battery. The electrolyte may comprise a liquid, solid, or gel.

First claim

What is claimed is:

1. A battery, the battery comprising:
a cathode, an electrolyte, and an anode comprising an active material, the active material comprising:
silicon particles; and
an additive comprising silosilazane wherein said silosilazane comprises one or more amine groups and one or more of: silyl chlorides, dialkylaminosilanes, and cyclic azasilanes.

2. The battery according to claim 1 , wherein the active material comprises a film with a thickness between 10 microns and 80 microns.

3. The battery according to claim 1 , wherein the active material is held together by a pyrolyzed carbon film.

4. The battery according to claim 1 , wherein the anode comprises lithium, sodium, potassium, silicon, and/or mixtures and combinations thereof.

5. The battery according to claim 1 , wherein the active material comprises a coating comprising one or more of: a metal oxide, a ceramic, and a polymer.

6. The battery according to claim 1 , wherein the electrolyte comprises a liquid, solid, or gel.

7. A method of forming a battery, the method comprising:
forming a battery comprising an anode, a cathode, and an electrolyte, the anode comprising a silicon-dominant active material that comprises silicon particles and an additive comprising silosilazane; wherein said silosilazane comprises one or more amine groups and one or more of: silyl chlorides, dialkylaminosilanes, and cyclic azasilanes.

8. The method according to claim 7 , wherein the silicon-dominant material is formed by coating a substrate with a slurry comprising a carbon binder, silicon particles, and silosilazane.

9. The method according to claim 7 , wherein the active material comprises a film with a thickness between 10 microns and 80 microns.

10. The method according to claim 7 , wherein the active material is held together by a pyrolyzed carbon material.

11. The method according to claim 7 , wherein the active material comprises a coating comprising one or more of: a metal oxide, a ceramic, and a polymer.

12. An anode for a battery, the anode comprising:
an active material on a conductive current collector, wherein the active material comprises:
silicon particles;
carbon; and
an additive comprising silosilazane; wherein said silosilazane comprises one or more amine groups and one or more of: silyl chlorides, dialkylaminosilanes, and cyclic azasilanes.

Assignees

• Enevate Corp

Inventors

• Ansari Younes
• Kasavajjula Uday
• Park Benjamin
• Chhorng Monika
• Nair Ambica
• Perera Sanjaya
• Lee David J

Classifications

• H01M4/628 Primary

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/625

  Carbon or graphite · CPC title