Lithium anode and method for producing same

Patent metadata

Field	Value
Publication number	US-11276854-B2
Application number	US-201916421890-A
Country	US
Kind code	B2
Filing date	May 24, 2019
Priority date	May 25, 2018
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A lithium anode for a lithium cell and/or lithium battery comprises: a current conductor layer, an anode active material and a coating, wherein the current conductor layer is embodied in the manner of a lattice with a conductor structure that defines open voids, the anode active material is arranged in the cavities between the conductor structure, and the coating covers the current conductor layer and the anode active material. The invention also relates to a method for manufacturing such a lithium anode.

First claim

The invention claimed is:

1. A lithium anode for a lithium cell and/or lithium battery, comprising:
a current conductor layer,
an anode active material, and
a coating,
wherein the current conductor layer is embodied in the manner of a lattice with a conductor structure that defines open voids, the anode active material is disposed in the voids between the conductor structure, and the coating covers the current conductor layer and the anode active material, and
wherein the anode active material is arranged in the voids such that free volume is formed between the anode active material and the conductor structure and/or free volume is formed between the anode active material and the coating.

2. The lithium anode as set forth in claim 1 , wherein the conductor structure comprises one of the following structures: expanded metal; perforated, punched, and/or slotted sheet metal; perforated, punched, and/or slotted metal foil; welded wire arrangement; woven wire arrangement; knitted wire arrangement; and wire scrim.

3. The lithium anode as set forth in claim 1 , wherein the conductor structure comprises a metallic material, particularly copper.

4. The lithium anode as set forth in claim 3 , wherein the metallic material comprises copper.

5. The lithium anode as set forth in claim 1 , wherein the anode active material is permeable to lithium ions in the voids of the current conductor layer.

6. The lithium anode as set forth in claim 1 , wherein the anode active material comprises a metalloid material, particularly Si.

7. The lithium anode as set forth in claim 6 , wherein the metalloid material comprises Si.

8. The lithium anode as set forth in claim 1 , wherein the coating is arranged on both sides of the current conductor layer.

9. The lithium anode as set forth in claim 1 , wherein the coating is made of a lithium ion-conducting material.

10. The lithium anode as set forth in claim 9 , wherein the lithium ion-conducting material comprises a carbon material and/or lithium titanate, LTO (Li 4 Ti 5 O 12 ).

11. The lithium anode as set forth in claim 10 , wherein the carbon material comprises one of the following materials: graphite, hard carbon, soft carbon, and carbon tubes.

12. A lithium battery, comprising a lithium anode as set forth in claim 1 , a cathode, an electrolyte material, and a separator that separates the lithium anode and the cathode from one another.

13. A method for manufacturing a lithium anode as set forth in claim 1 , comprising:
providing a current conductor layer that is embodied in the manner of a lattice with a conductor structure that defines open voids,
arranging anode active material in the voids between the conductor structure; and
coating the current conductor layer with a lithium-conducting material.

14. The method as set forth in claim 13 , wherein the provision of the current conductor layer comprises the provision, production, and preparation of the conductor structure by means of a joining method and/or a mechanical processing method.

15. The method as set forth in claim 14 , wherein the arrangement of the anode active material in the voids between the conductor structures comprises a dipping process.

16. The method as set forth in claim 15 , wherein the arrangement of the anode active material in the voids between the conductor structures comprises a rolling process.

Assignees

• Volkswagen Ag

Inventors

• Weber Dominik
• Lemke Andreas
• Schilde Sylke
• Zipprich Wolfgang

Classifications

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M10/0525

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

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/139

  Processes of manufacture · CPC title