ELECTRODES FOR AN ELECTRIC FACILITY, SUCH AS A LITHIUM-ION CELL, OPERATING ACCORDING TO GALVANIC PRINCIPLES, AND METHODS OF MAKING THE SAME

• US 20100112453A1
• Filed: 10/23/2009
• Published: 05/06/2010
• Est. Priority Date: 10/23/2008
• Status: Abandoned Application

• Current Assignee: Li-Tec Battery GmbH (Mercedes-Benz Group AG)
• Original Assignee: Li-Tec Battery GmbH (Mercedes-Benz Group AG)
• Inventors: Schäfer, Tim, Gutsch, Andreas
• Application Number:
  US12/604,533
• Publication Number:
  US 20100112453A1
• Time in Patent Office: Days
• US Class Current: 429/231.950
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 4/04 Processes of manufacture in general
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/139 Processes of manufacture
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/49108 Electric battery cell making

Abstract

A method of making an electrode for a device operating according to galvanic principles, in particular a lithium-ion cell, comprises the steps of: (i) making a sheet-like electrode (2), (ii) detecting where one or more imperfections (4, 4′, 4″) exist on said sheet-like electrode, and (iii) with respect to a respectively detected imperfection (4, 4′, 4″), correcting a surrounding area (6, 6′) of the imperfection (4, 4′, 4″) including said imperfection. Based on the result of detection step (ii), at least a portion (8, 8′, 8″) of the laminar electrode may be provided that has no imperfection.

In an electrode made according to the method, in particular cathode or anode, for a device operating according to galvanic principles, in particular a lithium-ion cell comprising an electrode material that is arranged in a sheet-like manner, the electrode material is composed of at least a first, in particular slat-like portion (22-1), which is free from imperfections, and a second, in particular slat-like portion (22-2), which is free from imperfections.

A device operating according to galvanic principles, in particular a lithium-ion cell, comprises the following layers, which are arranged one upon the other: a first electrode (32), which is free from imperfections, which comprises at least two assembled portions, which are free from imperfections, a separator layer (50) comprising a separator material (16) that is developed in a sheet-like manner, and a second electrode, which is free from imperfections, which consists of a one-piece portion or which comprises at least two assembled portions, which are free from imperfections, and which is complementary to the first electrode.

Claims

1. Method of making an electrode for a device operating according to galvanic principles, in particular a lithium-ion cell, comprising:

(i) making a sheet-like electrode;

(ii) detecting where on the sheet-like electrode one or more imperfections are present, and

(iii) for a respectively detected imperfection, removing a surrounding of the imperfection including said imperfection.

2. Method according to claim 1, wherein based on the result of the detection step, additionally at least a portion of the sheet-like electrode without imperfection is provided.

3. Method according to claim 1 wherein the step of making the sheet-like electrode is made in a web-like manner, for example, in a continuous method.

4. Method according to claim 1 wherein the step of making the sheet-like electrode is made in the form of a sheet, for example, in a stacking method.

5. Method according to claim 1, wherein the step of detecting is selected from a group consisting of:

an optical method, a method comprising the analysis of microscopically magnified images of regions of the sheet-like electrode, a method comprising the measurement of a dielectric capacity of regions of the sheet-like electrode, and a combinations thereof.

6. Method according to claim 5, wherein said optical method of detecting imperfection comprises:

recording an image, in particular in reflection or transmission, of a region of the sheet-like electrode, and

detecting a local deviation of a value of an image parameter that in particular is indicative for an imperfection, for example, brightness or contrast, of an average value of the image parameter, which has been determined across a relatively large area.

7. Method according to claim 6, wherein the method comprising said measurement of the electric conductivity comprises:

measuring an electric resistance of a region of the sheet-like electrode, in particular a slat-like region particularly in longitudinal direction thereof.

8. Method according to claim 6, wherein the method comprising said analysis of microscopically magnified images comprises:

recording a magnified image of a region of the sheet-like electrode, in particular by means of an optical microscope or a scanning electron micrograph, and

by means of in particular sequential recording of images in several, suitably positioned regions, scanning the surface of the sheet-like electrode.

9. Method according to claim 6, wherein the method comprising measurements of the dielectric capacity comprises:

measuring the dielectric capacity of a respective region of the sheet-like electrode, which is within a measurement window, and

by in particular sequential measuring of the dielectric capacity in several, suitably positioned measurement windows, respectively regions, scanning the surface of the sheet-like electrode.

10. Method according to claim 1, wherein the making step comprises the application of a layer of an electrode material, in particular a cathode material or an anode material, onto a substrate, in particular onto a material diverting an electric current, such as a metal foil.

11. Method according to claim 10, wherein in a removal step, the section of the layer of the electrode material, which contains the imperfection, is removed from the substrate, and a fresh electrode layer is applied onto the substrate in the uncovered section, an that in the fresh electrode layer it is in particular subsequently detected whether and where one or more imperfections are present therein.

12. Method according to claim 1, wherein in a removal step a region of the sheet-like electrode, which contains the imperfection, is removed from the sheet-like electrode, and is replaced by a region without imperfection of the same or another sheet-like electrode, which corresponds to the form of the removed region.

13. Method according to claim 1, wherein in a removal step a slat of the sheet-like electrode, which comprises a detected imperfection, is detached from the sheet-like electrode along parallel separation line, for example, is cut out or stamped out.

14. Method according to claim 13, wherein if in said detaching of the region of the sheet-like electrode (2), which contains a detected imperfection, two portions are created, which contain no imperfection, the created portions are assembled along the separation line.

15. Method according to claim 1, further comprising:

assembling two sections without imperfections of the same sheet-like electrode, or two sections without imperfections, which have been detached from two different sheet-like electrodes, along the respective edges, respectively separation lines of the sections.

16. Method according to claim 15, wherein the step of assembling comprises a contacting of the edges in a stack-like manner of the sections to be assembled.

17. Method according to claim 15, wherein the step of assembling comprises an overlapping contacting of respective edge slats, which in particular run along the edges of the sections to be assembled.

18. Method according claim 1, wherein after the removal step at least a portion of the sheet-like electrode is coiled up.

19. Method according claim 1, wherein after the removal step a layer of a separator material is applied onto at least one region of the sheet-like electrode, and at least a portion of the region, which has been provided with the applied separator material of the sheet-like electrode, is coiled up.

20. Method according claim 1, wherein after the removal step, further comprising:

alternately folding the sheet-like electrode in regular distances and along folding lines, which essentially are arranged in parallel towards each other, into a first direction and into a direction, which is opposite to the first direction,

forming a stack of sections of the sheet-like electrode, which are arranged one upon the other, and which are connected along a folding line, respectively, and in particular furthermore

inserting separator material that is developed in a sheet-like manner, in particular in the form of sheets of separator material, which are congruently developed with respect to two respective sections, which are arranged one upon the other, between the respective sections of the sheet-like electrode, which are arranged one upon the other.

21. A method of making an electrode for a device operating according to galvanic principles, in particular a lithium-ion cell, comprising:

(i) making a sheet-like electrode,

(ii) detecting where on the sheet-like electrode one or more imperfections are present, and

(iii) based on the result of the detection step, providing at least one portion without imperfections of the sheet-like electrode.

22. Method according to claim 21, further comprising:

connecting at least one section of an edge of a first portion without imperfections of the sheet-like electrode to at least one section of an edge of a second portion without imperfections of the same electrode, or of a second sheet-like electrode, along respective positive sections of the edges, which in particular are at least sectionally linear, of the first and second portion.

23. Method according to claim 22, wherein the first and the second portion and a third portion without imperfections of the first, second or third sheet-like electrode are developed in a slat-like manner, respectively, and that the method further comprises:

connecting at least a section of the edge of the third portions to at least one section of the edge of the second portion, which faces the section of the edge of the second portion, which is connected to the first portion.

24. Method of making a device operating according to galvanic principles, in particular a lithium-ion cell, comprising:

forming an arrangement one upon the other of;

a region of a sheet-like electrode comprising cathode material without imperfections according to claim 21, wherein,

a separator material that is provided in a sheet-like manner, and

a region of a sheet-like electrode comprising anode material without imperfections.

25. Method of making a device operating according to galvanic principles, in particular a lithium-ion cell, comprising:

connection two, three, four of more portions of a sheet-like electrode without imperfections, and forming an electrode, which is assembled from portions, in particular cathode (32) or anode,

forming an arrangement one upon the other comprising the assembled electrode, in particular cathode or anode, as first layer, a separator layer from separator material that is provided in a sheet-like manner as second layer, and an electrode, which is made from a one-piece portion without imperfections, and which is complementary to the assembled electrode, in particular anode or cathode, as a third layer.

26. Method of making a device operating according to galvanic principles, in particular a lithium-ion cell, comprising:

connecting two, three, four of more portions without imperfections of sheet-like electrodes comprising cathode material, and forming a sheet-like cathode, which is assembled from the portions,

connecting two, three, four, respectively more portions without imperfections of sheet-like electrodes comprising anode material, and forming a sheet-like anode, which is assembled from the portions, and

forming an arrangement one upon the other consisting of the assembled cathode as first layer, a separator layer from separator material that is provided in a sheet-like manner as second layer, and the assembled anode as third layer.

27. Method according to claim 26, wherein the two, three, four, respectively more portions comprising anode material have been congruently developed to the respective two, three, four, respectively more portions comprising cathode material, and that the respective portions comprising cathode material, which are congruently anode material, are congruently arranged one upon the other in the arrangement one upon the other comprising separator material, which is arranged between.

28. Method according to claim 26, wherein the two, three, four, or more portions comprising cathode material, and the two, three, four, respectively more portions comprising anode material are slat-like portions, respectively.

29. Method of making a device operating according to galvanic principles, in particular a lithium-ion cell, comprising:

providing first slat-like portions without imperfections comprising a first cathode material,

providing second slat-like portions without imperfections comprising a second cathode material,

providing first slat-like portions without imperfections comprising a first anode material,

providing second slat-like portions without imperfections comprising a second anode material,

forming a sheet-like cathode of portions, which are arranged in parallel towards each other and which are connected to each other, wherein the first portions comprising the first cathode material, and the second portions comprising the second cathode material, are alternately connected to each other,

forming a sheet-like anode from portions, which are arranged in parallel towards each other and which are connected to each other, wherein the first portions comprising the first anode material, and the second portions comprising the second anode material, are alternately connected to each other, and

forming an arrangement one upon the other consisting of the cathode as first layer, a separator layer from separator material that is provided in a sheet-like manner as second layer, and the anode as third layer.

30. Method according to claim 29, wherein the respective slat-like portions of the cathode (32), and the slat-like portions of the anode, are congruently arranged one upon the other in the arrangement one upon the other comprising separator material, which is arranged between.

31. Method according to claim 29, wherein the first cathode material and the second cathode material are the same cathode material, respectively that the first anode material and the second anode material are the same anode material.

32. Method according to claim 29, wherein the first slatlike portions of the cathode comprises the first cathode material in a first thickness, and the second slat-like portions of the cathode comprises the second cathode material in a second thickness.

33. Method according to claim 29, wherein the first slat-like portions of the anode comprises the first anode material in a third thickness, and the second slat-like portions of the anode comprises the second anode material in a fourth thickness.

34. Method according to claim 32, wherein, portions comprising the cathode material in the relatively larger thickness are congruently arranged in the arrangement one upon the other with respect to the portions of the anode (42) comprising the anode material in the relatively larger thickness.

35. An electrode, in particular cathode or anode, for a device operating according to galvanic principles, in particular a lithium-ion cell,

comprising electrode material that is arranged in a sheet-like manner, wherein the electrode material is assembled from a first portion without imperfections, and a second portion without imperfections.

36. Electrode according to claim 35, wherein the first portion includes a first edge section, and the second portion includes a second edge section, which is positively developed with respect to the first edge section, wherein the first portion and the second portion are connected to each other along at least sections of the first and second edge section.

37. Electrode according to claim 35, wherein the first edge section and the second edge section are connected to each other such that they meet each other.

38. Electrode according to claim 36, wherein, the first edge section and the second edge section are overlappingly connected to each other.

39. Electrode according to claim 36, wherein a respective portion is slat-like.

40. Electrode according to claim 36, wherein the first portion comprises a first electrode material, and the second portion comprises a second electrode material.

41. Electrode according to claim 36, wherein the first portion comprises a first electrode material comprising a first thickness, and the second portion comprises a second electrode material comprising a second thickness.

42. Electrode according to claim 36, further comprising:

three or more portions, which are arranged in parallel towards each other and side by side with respect to their respective longitudinal axis.

43. Electrode according to claim 36, wherein a portion includes a first electrode material, which is developed in a first thickness, and a portion comprising a second electrode material, which is developed in a second thickness, are alternately arranged.

45. Electrode according to claim 36, further comprising:

a separator material that is developed in a sheet-like manner, which overlaps all portions.

46. Electrode according to claim 36, wherein said electrode is coiled up.

47. Electrode according to claim 36, wherein it is alternately folded in regular distances and along folding lines, which essentially are arranged in parallel towards each other, into a first direction and into a direction, which is opposite to the first direction, and comprises an arrangement one upon the other of sections, which are arranged one upon the other and are connected along a folding line, respectively, and that in particular furthermore between respective sections, which are arranged one upon the other, separator material that is developed in a sheet-like manner is arranged, in particular in the form of sheets of separator material, which are congruently arranged with respect to the sections that are arranged one upon the other.

44. Electrode, in particular cathode or anode, for a cell operating according to galvanic principles, in particular a lithium-ion cell, comprising electrode material that is arranged in a sheet-like manner, wherein the electrode material comprises a one-piece portion without imperfections, which in particular has been tested to be without imperfections.

48. Device operating according to galvanic principles, in particular a lithium-ion cell, wherein said device comprises an arrangement one upon the other of the following layers:

a first electrode without imperfections, which in particular has been made, which comprises at least two assembled portions without imperfections, a separator layer comprising a separator material that is developed in a sheet-like manner, and

a second electrode without imperfections, and which comprises a one-piece portion, and which is complementary to the first electrode,

wherein the separator layer is arranged between the first electrode and the complementary second electrode, and overlaps the first electrode, respectively the second electrode.

49. Device operating according to galvanic principles, in particular a lithium-ion cell,

wherein, it comprises an arrangement one upon the other comprising the following layers:

a cathode (32) without imperfections, and which comprises at least two assembled portions without imperfections,

a separator layer comprising a separator material that is developed in a sheet-like manner, and

an anode without imperfections, and which comprises at least two assembled portions without imperfections,

wherein the separator layer is arranged between the cathode and the anode, and overlaps the cathode, respectively the anode.

50. Device according to claim 49, wherein, the cathode comprises three or more slat-like portions, and the anode comprises slat-like portions in the same number as the cathode, wherein the portions of the cathode and the portions of the anode are congruently arranged towards each other, respectively.

51. Device according to claim 50, wherein, the cathode alternately comprises portions comprising a first cathode material, which is developed in a first thickness, and portions comprising a second cathode material, which is developed in a second thickness, and/or that the anode alternately comprises portions comprising a first anode material, which is developed in a third thickness, and portions comprising a second anode material, which is developed in a fourth thickness.

52. Device according to claim 51, wherein, the first cathode material is the same material as the second cathode material and/or that the first anode material is the same material as the second anode material.

53. Device according to claim 51, wherein portions of the cathode comprising the cathode material in the larger thickness are congruently arranged in the arrangement one upon the other with respect to the portions of the anode comprising the anode material in the larger thickness.

54. Device according to claim 51, wherein portions of the cathode comprising the cathode material in the larger thickness are congruently arranged in the arrangement one upon the other with respect to the portions of the anode comprising the anode material in the smaller thickness.