Battery electrode, battery, and method for manufacturing a battery electrode

Patent metadata

Field	Value
Publication number	US-10170746-B2
Application number	US-201213653493-A
Country	US
Kind code	B2
Filing date	Oct 17, 2012
Priority date	Oct 17, 2012
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A battery electrode in accordance with various embodiments may include: a substrate including a surface configured to face an ion-carrying electrolyte; and a first diffusivity changing region at a first portion of the surface, wherein the first diffusivity changing region is configured to change diffusion of ions carried by the electrolyte into the substrate, and wherein a second portion of the surface is free from the first diffusivity changing region.

First claim

What is claimed is:

1. A battery electrode, comprising:
a doped substrate comprising a surface configured to face an ion-carrying electrolyte during operation of the battery electrode, wherein the doped substrate comprises a first conductivity type and wherein the doped substrate is a doped integral semiconductor substrate; and
a first diffusivity changing region at a first portion of the surface of the doped substrate, the first diffusivity changing region comprising a thermally activated counter-doped region in the doped substrate, the thermally activated counter doped semiconductor region comprising a second conductivity type, wherein the first diffusivity changing region is configured to change diffusion of ions carried by the electrolyte into the doped substrate, and
wherein a second portion of the surface of the doped substrate is exposed and free from the first diffusivity changing region and comprises the first conductivity type, and
wherein the second conductivity type is opposite the first conductivity type.

2. The battery electrode of claim 1 ,
wherein the doped substrate comprises a material is selected from a group of materials, the group consisting of: silicon, germanium, gallium nitride, gallium arsenide, and silicon carbide.

3. The battery electrode of claim 1 ,
wherein the doped substrate comprises a material that has a maximum dilation of greater than or equal to about 5% when fully loaded with ions carried by the electrolyte.

4. The battery electrode of claim 1 ,
wherein the battery electrode is configured as an anode in a discharge mode.

5. The battery electrode of claim 1 ,
wherein the ions carried by the electrolyte comprise ions of at least one material selected from a group of materials, the group consisting of: an alkali metal, an alkaline earth metal, a chalcogen, and a halogen.

6. The battery electrode of claim 1 ,
wherein the ions carried by the electrolyte comprise ions of at least one material selected from a group of materials, the group consisting of: magnesium, sodium, lithium, potassium, calcium, oxygen, sulphur, chlorine, and fluorine.

7. The battery electrode of claim 1 , further comprising:
a second diffusivity changing region at the second portion of the surface,
wherein the first diffusivity changing region is configured to reduce diffusion of ions carried by the electrolyte into the doped substrate, and
wherein the second diffusivity changing region is configured to enhance diffusion of ions carried by the electrolyte into the doped substrate.

8. The battery electrode of claim 1 ,
wherein the first diffusivity changing region has a thickness in the range from about 1 nm to about 10 μm.

9. The battery electrode of claim 7 ,
wherein at least one of the first diffusivity changing region and the second diffusivity changing region has a thickness in the range from about 1 nm to about 10 μm.

10. The battery electrode of claim 1 ,
wherein the doped substrate comprises a base region and at least one protrusion extending from the base region,
wherein the surface configured to face the ion-carrying electrolyte comprises a surface of the base region and a surface of the at least one protrusion.

11. The battery electrode of claim 10 ,
wherein the first portion of the surface configured to face the ion-carrying electrolyte comprises the surface of the base region,
wherein the second portion of the surface configured to face the ion-carrying electrolyte comprises the surface of the at least one protrusion, and
wherein the first diffusivity changing region is configured to reduce diffusion of ions carried by the electrolyte into the doped substrate.

12. The battery electrode of claim 7 ,
wherein the doped substrate comprise a base region and at least one protrusion extending from the base region;
wherein the first portion of the surface configured to face the ion-carrying electrolyte comprises a surface of the base region; and
wherein the second portion of the surface configured to face the ion-carrying electrolyte comprises a surface of the at least one protrusion.

13. A battery, comprising:
an ion-carrying electrolyte; and
at least two battery electrodes, wherein at least one battery electrode of the at least two battery electrodes comprises:
a doped substrate comprising a surface facing the ion-carrying electrolyte wherein the doped substrate comprises a first conductivity type; and
a first diffusivity changing region at a first portion of the surface of the doped substrate, the first diffusivity changing region comprising a thermally activated counter-doped region in the doped substrate, the thermally activated counter doped region comprising a second conductivity type, wherein the first diffusivity changing region is configured to change diffusion of ions carried by the ion-carrying electrolyte into the doped substrate,

wherein a second portion of the surface of the doped substrate is free from the first diffusivity changing region and comprises the first conductivity type.

14. The battery of claim 13 ,
wherein the doped substrate comprises a base region and at least one protrusion extending from the base region,
wherein the first portion of the surface facing the ion-carrying electrolyte comprises a surface of the base region,
wherein the second portion of the surface facing the ion-carrying electrolyte comprises a surface of the at least one protrusion, and
wherein the first diffusivity changing region is configured to reduce diffusion of ions carried by the ion-carrying electrolyte into the doped substrate.

15. The battery of claim 14 ,
wherein the second portion of the surface of the doped substrate comprises a second diffusivity changing region, the second diffusivity changing region comprising an amorphized region in the at least one protrusion.

16. The battery of claim 15 ,
wherein the first diffusivity changing region is configured to reduce diffusion of ions carried by the ion-carrying electrolyte into the doped substrate, and
wherein the second diffusivity changing region is configured to enhance diffusion of ions carried by the ion-carrying electrolyte into the doped substrate.

17. The battery of claim 13 ,
wherein the at least one battery electrode is configured as an anode of the battery.

18. The battery of claim 13 ,
configured as a lithium-ion battery.

19. A battery electrode, comprising:
a doped substrate comprising a surface configured to face an ion-carrying electrolyte during operation of the battery electrode, wherein the doped substrate comprises a base region and at least two protrusions having exposed sidewalls and exposed top surfaces extending from the base region, wherein the surface of the doped substrate comprises a surface of the base region between the at least two protrusions and comprises the sidewalls and top surfaces of the at least two protrusions, and wherein in an uncharged state of the battery electrode, the surface of the doped substrate has a non-planar shape; and
a first diffusivity changing region at the surface of the base region between the at least two protrusions, the first diffusivity changing region comprising a photoresist material, wherein the first diffusivity changing region is configured to change diffusion of ions carried by the electrolyte into the doped substrate, and
wherein the sidewalls and top surfaces of the at least two protrusions and a region of the doped substrate underneath the at least two protrusions are free from the first diffusivity changing region,
wherein a portion of

Assignees

• Infineon Technologies Ag

Inventors

• Hirschler Joachim
• Forster Magdalena
• Sorger Michael
• Schmut Katharina
• Goller Bernhard
• Schweizer Philemon
• Sternad Michael
• Walter Thomas

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/04 Primary

  Processes of manufacture in general · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title