Method for producing a solid electrolyte membrane or an anode, and solid electrolyte membrane or anode

Patent metadata

Field	Value
Publication number	US-12100858-B2
Application number	US-201917413985-A
Country	US
Kind code	B2
Filing date	Dec 17, 2019
Priority date	Dec 18, 2018
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A method for producing a solid electrolyte membrane ( 3 ) or an anode unit for a solid-state battery, in which method a powder mixture consisting of a solid electrolyte material and polytetrafluoroethylene is produced for the solid electrolyte membrane ( 3 ) and a powder mixture consisting of an electrode material, a solid electrolyte material, an electrically conductive conduction additive and polytetrafluoroethylene is produced for the anode unit, at least partially fibrillated polytetrafluoroethylene is formed by applying shear forces to the powder mixture, and the powder mixture is shaped into a flexible composite layer. The powder mixture has at most 1 wt. % polytetrafluoroethylene.

First claim

The invention claimed is:

1. A method of producing a solid electrolyte membrane or an anode unit for a solid state battery,
producing a powder mixture of a solid electrolyte membrane and polytetrafluoroethylene for the solid electrolyte membrane, or producing a powder mixture of an electrode material, a solid electrolyte material, an electrically conductive additive, and polytetrafluoroethylene for the anode unit;
forming at least partially fibrillated polytetrafluoroethylene by the effect of shear forces on the powder mixture;
shaping the powder mixture into a flexible composite layer as the solid electrolyte membrane or into a layer arranged on a current collector layer and composed of a composite material of the anode unit; wherein
the powder mixture has a maximum of 1 weight percent polytetrafluoroethylene.

2. The method in accordance with claim 1 , wherein the at least partially fibrillated polytetrafluoroethylene is formed by grinding, mixing in a worm shaft or mixing in a calender roll device, or a combination thereof.

3. The method in accordance with claim 1 , wherein the powder mixture is shaped into the flexible composite layer by rolling, pressing, or extrusion.

4. The method in accordance with claim 1 , wherein the powder mixture for the solid electrolyte membrane comprises the solid electrolyte material in a concentration of 99 weight percent to 99.9 weight percent and the polytetrafluoroethylene in a concentration of 0.1 weight percent to 1 weight percent.

5. The method in accordance with claim 1 , wherein the polytetrafluoroethylene is present as a completely monoaxially or completely biaxially oriented polytetrafluoroethylene.

6. A solid electrolyte membrane comprising a solid electrolyte material and polytetrafluoroethylene, wherein the solid electrolyte membrane comprises a maximum of 1 weight percent polytetrafluoroethylene.

7. An anode unit having an electrically conductive current collector layer and a layer arranged on the current collector layer and composed of a composite material that has an electrode material, a solid electrolyte material, an electrically conductive additive, and polytetrafluoroethylene as a binding agent, wherein the composite material comprises a maximum of 1 weight percent polytetrafluoroethylene and the polytetrafluoroethylene is at least partially present as fibrillated polytetrafluoroethylene.

8. The anode unit in accordance with claim 7 , wherein the composite material comprises at least 0.1 weight percent polytetrafluoroethylene.

9. The anode unit in accordance with claim 7 , wherein the electrode material comprises a protective layer applied to particles of the electrode material.

10. A solid electrolyte electrode composite in which the solid electrolyte membrane in accordance with claim 6 is applied directly onto a first electrode unit formed from a first active layer and a first carrier film.

11. The solid electrolyte electrode composite in accordance with claim 10 , wherein the solid electrolyte membrane and the first active layer form a laminate.

12. A solid state battery having a solid electrolyte electrode composite in accordance with claim 10 , wherein an anode unit is applied to a surface of the solid electrolyte membrane disposed opposite the first electrode unit with a current collector layer as a second carrier film and a layer of a composite material as a second active layer.

13. The solid state battery in accordance with claim 12 , wherein a material of the second carrier film differs from a material of the first carrier film.

Assignees

• Fraunhofer Ges Forschung
• Univ Dresden Tech
• Fraunhofer Ges Zur Foerderung Der Angewandten Forschung B V

Inventors

• Hippauf Felix
• Schumm Benjamin
• Tschoecke Sebastian
• Althues Holger
• Kaskel Stefan
• Doerfler Susanne

Classifications

• H01M50/406

  Moulding; Embossing; Cutting · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• H01M4/0435

  Rolling or calendering · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/13

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