Electrode fabrication methods and associated systems and articles

Patent metadata

Field	Value
Publication number	US-9711784-B2
Application number	US-201514700258-A
Country	US
Kind code	B2
Filing date	Apr 30, 2015
Priority date	May 1, 2014
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

Sulfur-based electrodes, and associated systems and methods for their fabrication, are generally described. Certain embodiments relate to sulfur-based electrodes with smooth external surfaces. According to some embodiments, relatively large forces can be applied to compositions from which the sulfur-based electrodes are made during the fabrication process. In some such embodiments, the compositions can maintain relatively high porosities, even after the relatively large forces have been applied to them. Methods in which liquids are employed during the electrode fabrication process are also described.

First claim

What is claimed is:

1. A method of making an electrode, comprising:
applying a pressure of at least about 590 Newtons/cm 2 to a composition comprising a particulate electronically conductive material, an electrode active material, a binder, and a liquid wetting agent to form the electrode.

2. A method of making an electrode, comprising:
applying a pressure of at least about 1765 Newtons/cm 2 to a composition comprising a particulate electronically conductive material, an electrode active material, and a binder to form the electrode,
wherein after the pressure has been applied to the composition, the electrode has a porosity of at least about 40%.

3. The method of claim 1 , wherein after the pressure has been applied to the composition, the electrode has a porosity of at least about 40%.

4. The method of claim 1 , comprising applying a pressure of from about 590 Newtons/cm 2 to about 6000 Newtons/cm 2 to the composition.

5. The method of claim 1 , wherein the liquid wetting agent makes up at least about 1 wt % of the composition to which pressure is applied, at a point just before the pressure is applied to the composition.

6. The method of claim 1 , wherein the liquid wetting agent makes up at least about 10 wt % of the composition to which pressure is applied, at a point just before the pressure is applied to the composition.

7. The method of claim 1 , further comprising, after applying the pressure, removing at least about 50 wt % of the liquid wetting agent from the composition.

8. The method of claim 2 , comprising applying a pressure of from about 1765 Newtons/cm 2 to about 6000 Newtons/cm 2 to the composition.

9. The method of claim 2 , wherein the composition further comprises a liquid wetting agent that makes up at least about 1 wt % of the composition to which pressure is applied, at a point just before the pressure is applied to the composition.

10. The method of claim 2 , wherein the composition further comprises a liquid wetting agent that makes up at least about 10 wt % of the composition to which pressure is applied, at a point just before the pressure is applied to the composition.

11. The method of claim 10 , further comprising, after applying the pressure, removing at least about 50 wt % of the liquid wetting agent from the composition.

Assignees

• Sion Power Corp
• Basf Se

Inventors

• Kelley Tracy Earl
• Burnside-Joubert Savannah V
• Schmidt Ruediger
• Schneider Holger
• Leitner Klaus
• Kulisch Joern

Classifications

• H01M4/622

  being polymers · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/136 Primary

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/043

  involving compressing or compaction · CPC title