Method for producing moulded parts consisting of a porous material impregnated with polysulfide

Patent metadata

Field	Value
Publication number	US-11380880-B2
Application number	US-201916961347-A
Country	US
Kind code	B2
Filing date	Jan 10, 2019
Priority date	Jan 16, 2018
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

Described herein is a process for the production of moldings made of porous material impregnated with polysulfide, the process including the following steps:(a) insertion of the porous material into a mold;(b) introduction of liquid polysulfide into the mold at a flow velocity within the porous material in the range from 0.5 to 200 cm/s;(c) cooling of the polysulfide to a temperature below the melting point of the polysulfide; and (d) removal of the porous material impregnated with the polysulfide.

First claim

What is claimed is:

1. A process for the production of moldings made of porous material impregnated with polysulfide, comprising the following steps:
(a) insertion of the porous material into a mold;
(b) introduction of liquid polysulfide into the mold at a flow velocity within the porous material in the range from 0.5 to 200 cm/s;
(c) cooling of the polysulfide to a temperature below the melting point of the polysulfide; and
(d) removal of the porous material impregnated with the polysulfide, wherein after filling of the mold and during cooling, a pressure is applied to introduce further polysulfide into the mold.

2. The process according to claim 1 , wherein after the insertion of the porous material the mold is flushed with an inert gas.

3. The process according to claim 1 , wherein, before the introduction of the polysulfide, a pressure below 100 mbar (abs) is applied to the mold.

4. The process according to claim 1 , wherein the temperature of the mold is in the range from 150 to 350° C.

5. The process according to claim 1 , wherein the temperature of the polysulfide when it is introduced into the mold is in the range from 285 to 350° C.

6. The process according to claim 1 , wherein the pressure for introducing further polysulfide in step (c) is in a range from 150 to 200 bar.

7. The process according to claim 1 , wherein introduction of the polysulfide into the mold is achieved by using a cold-chamber process, a hot-chamber process or a vacuum casting process.

8. The process according to claim 1 , wherein the polysulfide is an alkali metal polysulfide.

9. The process according to claim 8 , wherein the polysulfide is sodium polysulfide.

10. The process according to claim 1 , wherein the porous material is a felt, a woven fabric, a knitted fabric, a braided fabric, a nonwoven fabric, an open-pore foam or a three-dimensional network.

11. The process according to claim 1 , wherein the porous material is composed of graphite, of heat-stabilized polymer fibers, of fibers made of oxide ceramic, of glass fibers or of a mixture thereof.

12. The process according to claim 1 , wherein the molding is an electrode or a part of an electrode for an electrochemical cell.

13. The process according to claim 1 , wherein the molding is a storage element for use in an electrochemical cell.

14. The process according to claim 12 , wherein the electrochemical cell is a sodium-sulfur battery.

Assignees

• Basf Se

Inventors

• Bayer Domnik
• Zerpa Unda Jesus Enrique
• Jabczynski Wolfgang
• Ter Maat Johan

Classifications

• H01M4/0416 Primary

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title

• H01M4/664

  Ceramic materials · CPC title

• H01M4/5815

  Sulfides · CPC title

• H01M10/3909 Primary

  Sodium-sulfur cells · CPC title

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title