Supports and electrodes for primary and secondary electric cells

• US 5,670,278 A
• Filed: 02/01/1996
• Issued: 09/23/1997
• Est. Priority Date: 02/03/1995
• Status: Expired due to Fees

• Current Assignee: Hoechst Trevira GmbH & Co. KG (Sanofi )
• Original Assignee: Hoechst Trevira GmbH & Co. KG (Sanofi )
• Inventors: Wellenhofer, Herbert, Disselbeck, Dieter
• Primary Examiner(s): KALAFUT, STEPHEN J
• Application Number:
  US08/595,198
• Time in Patent Office: 600 Days
• Field of Search: 429/234, 429/241, 429/243, 429/245, 29/2, 427/121, 427/222, 427/389.9, 427/412
• US Class Current: 429/234
• CPC Class Codes: H01M 10/06 Lead-acid accumulators semi-lead accumulators H01M10/20
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/70 characterised by shape or form
• CPC Class Codes: H01M 4/74 Meshes or woven material; Expanded metal
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/10 Battery-grid making

Abstract

Described is a support for electrodes of primary or secondary electric cells, said support comprising an open-mesh, three-dimensional network structure composed of plastics threads coated unbrokenly with one or more efficiently conducting, thin metal coats and, to form the three-dimensional structure, being provided with humplike depressions and/or elevations which are distributed over its surface and in whose region the distance between the plastics threads is increased, wherein at least the outer metal coat of the plastics threads consists of a valve metal. Also described are electrodes comprising such a support and a process for producing the articles mentioned.

Claims

1. A support for positive electrodes of primary or secondary electric cells, said support comprising an open-mesh, three-dimensional network structure composed of plastics threads coated unbrokenly with one or more conducting, metal coats and, to form the three-dimensional structure, being provided with humplike depressions and/or elevations which are distributed over its surface and in whose region the distance between the plastics threads is increased, wherein at least the outer metal coat of the plastics threads consists of a valve metal.

2. The support of claim 1 wherein the open-mesh network structure consists of a textile sheet three-dimensionally deformed by an area-enlarging, mesh-opening deformation process.

3. The support of claim 1, wherein the open-mesh network structure consists of a textile sheet three-dimensionally deformed by deep drawing.

4. The support of claim 1, wherein the network structure has been shape stabilized with a thermoplastic or a thermosetting resin.

5. The support of claim 1, wherein the network structure has been coated with a conducting layer composed of one or more electrically conducting metal coats with a valve metal layer applied thereto as outer metal coat.

6. The support of claim 5, wherein the conducting layer is a copper layer.

7. The support of claim 1, wherein the valve metal is titanium.

8. The support of claim 1, wherein an electrically conducting base layer of electrolessly deposited metals, is present between the plastic of the network structure and the conducting layer.

9. The support of claim 1, wherein an electrically conducting base layer of polypyrrole is present between the plastic of the network structure and the conducting layer.

10. The support of claim 1, wherein an electrically conducting base layer of conductive carbon black, graphite or metal powders, is present between the plastic of the network structure and the conducting layer.

11. The support of claim 1, wherein the valve metal layer has a layer thickness of >

0.01 μ

m.

12. The support of claim 1, wherein the valve metal layer is passivated.

13. The support of claim 1, wherein the valve metal layer is electropassivated.

14. The support of claim 1, wherein the valve metal layer is additionally coated with a layer of PbO₂.

15. The support of claim 1, wherein a layer of lead is present between the valve metal layer and the PbO₂ layer.

16. An positive electrode for primary or secondary electric cells comprising a support and an active material, the support consisting of an open-mesh, three-dimensional network structure composed of plastics threads coated unbrokenly with one or more conducting, metal coats and, to form the three-dimensional structure, being provided with humplike depressions and/or elevations which are distributed over its surface and in whose region the distance between the plastics threads is increased, said support interspersing the active material skeletally, wherein at least the outer metal coat of the plastics threads consists of a valve metal.

17. The electrode of claim 16, wherein the open-mesh network structure of the support consists of a textile sheet three-dimensionally deformed by an area-enlarging deformation process.

18. The electrode of claim 16, wherein the open-mesh network structure has been shape-stabilized with a thermoplastic or a thermosetting resin.

19. The electrode of claim 16, wherein the open-mesh network structure of the support has been coated with a conducting layer composed of one or more electrically conducting metal coats with a valve metal layer applied thereto as outer metal coat.

20. The electrode of claim 16, wherein the conducting layer is a copper layer.

21. The electrode of claim 16, wherein the valve metal is titanium.

22. The electrode of claim 16, wherein an electrically conducting base layer of electrolessly deposited metals, is present between the plastic of the network structure and the conducting layer.

23. The electrode of claim 16, wherein an electrically conducting base layer of polypyrrole is present between the plastic of the network structure and the conducting layer.

24. The electrode of claim 16, wherein an electrically conducting base layer of conductive carbon black, graphite or metal powders, is present between the plastic of the network structure and the conducting layer.

25. The electrode of claim 16, wherein the valve metal layer has a layer thickness of >

0.01 μ

m.

26. The electrode of claim 16, wherein the valve metal layer is passivated.

27. The electrode of claim 16, wherein the valve metal layer is electropassivated.

28. The electrode of claim 16, wherein the valve metal layer is additionally coated with a layer of PbO₂.

29. The electrode of claim 16, wherein a layer of lead is present between the valve metal layer and the PbO₂ layer.

30. A process for positive producing a support for electrodes of primary or secondary electric cells by impregnating a sheetlike, deep-drawable, optionally electrically conductive textile material with a resin suitable for mechanically stabilizing the deformations and optionally filled with an electrically conductive filler, optionally intermediately drying the resin-impregnated textile material, deforming the resin-impregnated textile material into a three-dimensional structure with humplike depressions and/or elevations which are distributed over its surface in whose region the distance between the plastics threads is enlarged, by an area-enlarging deformation process at elevated temperature at which the resins melt, the temperature of the deforming apparatus being subsequently controlled so that the impregnating resin can harden, subsequent metallization of the resulting three-dimensionally deformed network material by

a) if necessary application of an electrically conducting base layer of metal or a layer of a different electrically conductive substance and

b) electrolytic deposition of a metal coat from 5 to 300 μ

m thickness as conducting layer, which comprises subsequently applying a valve metal layer in a thickness of at least 0;

01 μ

m, to the metallic conducting layer.

31. The process of claim 30, wherein a knitted fabric is subjected to the area-enlarging deformation process.

32. The process of claim 30, wherein an electrically conducting base layer of electrolessly deposited metals, is applied between the plastic of the network structure and the conducting layer.

33. The process of claim 30, wherein an electrically conducting base layer of polypyrrole is applied between the plastic of the network structure and the conducting layer.

34. The process of claim 30, wherein a layer of conductive carbon black, graphite or metal powders, is applied as the electrically conductive base layer.

35. The process of claim 30, wherein a titanium layer is applied as the valve metal layer.

36. The process of claim 30, wherein the valve metal layer is applied unbrokenly to the support network in an electrically generated plasma.

37. The process of claim 30, wherein the valve metal layer is applied by ion plating, cathode sputtering in an inert gas Or by vapor deposition in a high vacuum.

38. The process of claim 30, including electropassivating the valve metal layer.

39. The process of claim 30, including electrolytically depositing PbO₂ on the valve metal layer.

40. The process of claim 39, including coating a layer of lead between the valve metal layer and the PbO₂ layer.

41. The process of claim 30, including electropassivating the valve metal layer, and wherein the depositing of the PbO₂ layer and the passivating of the valve metal layer are carried out simultaneously.