Electrode and energy store including an electrode

Patent metadata

Field	Value
Publication number	US-9819028-B2
Application number	US-201214238596-A
Country	US
Kind code	B2
Filing date	Jun 15, 2012
Priority date	Aug 15, 2011
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

An electrode, in particular a gas diffusion electrode, for a metal-oxygen battery. To achieve an improved performance output, e.g., an improved energy density or an improved capacity, the electrode includes a porous carrier substrate on which a porous active material is situated, the electrode having a gradient of medium pore sizes between the carrier substrate and the active material. Also described is an energy store including the electrode as described.

First claim

What is claimed is:

1. An electrode for a metal-oxygen battery, comprising:
a porous carrier substrate on which a porous active material is situated, the carrier substrate is at least partially formed from carbonized polymer fibers; and
a porous carbon layer that is situated between the carrier substrate and the active material;
wherein the electrode has a gradient of medium pore sizes between the carrier substrate and the active material such that a medium pore size of the active material is larger than a medium pore size of the carrier substrate, and
wherein pores of the porous carrier substrate have inner walls that are coated with a hydrophobic substance, the hydrophobic substance is polytetrafluoroethylene.

2. The electrode of claim 1 , wherein the carrier substrate is liquid-impermeable.

3. The electrode of claim 1 , wherein the carrier substrate is at least partially formed from at least one of depletion polymers, carbon nanotubes, carbon nanofibers and metal-plated polymers.

4. The electrode of claim 1 , wherein the carbonized polymer fibers are at least partially formed from one of polyacrylnitril, polyamide, polyurethane, polyester, polyterafluoroethelene, polystyrol, and cellulose.

5. The electrode of claim 1 , wherein at least one of the following is satisfied: (i) the carrier substrate has a medium pore size in a range of ≧1 μm to ≦100 μm; and (ii) the active material has a medium pore size in a range of ≧2 μm to ≦150 μm.

6. The electrode of claim 1 , wherein at least one of the following is satisfied: (i) the carrier substrate has a thickness in a range of ≧50 μm to ≦300 μm; and (ii) the active material has a thickness in a range of ≧50 μm to ≦100 μm.

7. The electrode of claim 1 , wherein the porous carbon layer has a hydrophobic material.

8. An energy store, comprising:
an anode;
a cathode; and
an electrolyte situated between the anode and the cathode;
wherein the cathode is an electrode for a metal-oxygen battery, including a porous carrier substrate on which a porous active material is situated, the carrier substrate is at least partially formed from carbonized polymer fibers and a porous carbon layer that is situated between the carrier substrate and the active material,
wherein the electrode has a gradient of medium pore sizes between the carrier substrate and the active material such that a medium pore size of the active material is larger than a medium pore size of the carrier substrate, and
wherein pores of the porous carrier substrate have inner walls that are coated with a hydrophobic substance, the hydrophobic substance is polytetrafluoroethylene.

9. The energy store of claim 8 , wherein the energy store is a metal-oxygen battery.

10. The electrode of claim 1 , wherein the electrode is a gas diffusion electrode.

11. The electrode of claim 1 , wherein the porous carbon layer has a thickness of about 10 μm.

12. The electrode of claim 1 , wherein the porous carrier substrate has a porosity in a range of ≧60% to ≦80%, and the porous active material has a porosity in a range of ≧70% to ≦90%.

13. The electrode of claim 1 , wherein the porous carbon layer has a medium pore size that is the same as the medium pore size of the carrier substrate.

14. The electrode of claim 1 , wherein the porous carbon layer has a medium pore size that is between the medium pore size of the carrier substrate and the medium pore size of the porous active material.

Assignees

• Lohmann Timm
• Maass Sebastian
• Liedtke Ralf
• Bosch Gmbh Robert

Inventors

• Lohmann Timm
• Maass Sebastian
• Liedtke Ralf

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M12/08

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• Y02E60/128

  Cross-Sectional Technologies · mapped topic

• H01M4/9016

  Oxides, hydroxides or oxygenated metallic salts · CPC title

• H01M4/8807

  Gas diffusion layers · CPC title