Battery mask from radiation curable and thermoplastic materials

• US 5,612,153 A
• Filed: 04/13/1995
• Issued: 03/18/1997
• Est. Priority Date: 04/13/1995
• Status: Expired due to Fees

• Current Assignee: Valence Technology Incorporated (Lithium Werks B.V.)
• Original Assignee: Valence Technology Incorporated (Lithium Werks B.V.)
• Inventors: Moulton, Russell D., Olsen, Ib I.
• Primary Examiner(s): Maples, John S.
• Application Number:
  US08/422,209
• Time in Patent Office: 705 Days
• Field of Search: 429/191, 429/216, 429/153, 429/254, 429/126, 429/162
• US Class Current: 429/304
• CPC Class Codes: H01M 10/02 Details of electrodes H01M4/00; of non-active parts H01M50/00
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 50/183 Sealing members
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A secondary, solid electrolytic battery includes a number of electrically connected electrolytic cells wherein for each cell the anode and cathode are separated from each other by a mask that is a layer of electrically insulative material that is coated along the perimeter of the anode and/or cathode. The mask reduces the rate of dendrite formation and prevents edge-effects, short circuits, and related problems caused by inadvertent contact of the anode and cathode.

Claims

1. A solid secondary electrolytic cell which comprises:

an anode;

a cathode;

a solid electrolyte functionally disposed between said anode and said cathode; and

a mask comprising an electrically insulative layer that is coated on a surface along the perimeter of said anode, cathode, or solid electrolyte, wherein the mask is fabricated by a process comprising;

(i) depositing a liquid radiation curable material onto said surface; and

(ii) curing said radiation curable material wherein the mask is interposed between the solid electrolyte and the anode or the cathode.

2. The solid, secondary electrolytic cell of claim 1 wherein the mask is coated on the perimeter of said anode.

3. The solid, secondary electrolytic cell of claim 2 wherein the length and width of the anode are less than those of the cathode.

4. The solid, secondary electrolytic cell of claim 1 wherein the mask is coated on the perimeter of said cathode.

5. The solid, secondary electrolytic cell of claim 1 wherein said radiation curable material comprises acrylates.

6. The solid, secondary electrolytic cell of claim 1 wherein said mask has a thickness of about 1 μ

m to about 25 μ

m.

7. The solid, secondary electrolytic cell of claim 1 wherein the anode comprises metallic lithium.

8. The solid, secondary electrolytic cell of claim 1 wherein the mask is substantially impermeable to electrolytic solvents and salts.

9. The solid, secondary electrolytic cell of claim 1 wherein the mask has a depth on each side that is about 0.5 to 10% of the anode, cathode, or solid electrolyte surface dimensions.

10. The solid, secondary electrolytic cell of claim 1 wherein the anode comprises intercalation carbon materials.

11. The solid, secondary electrolytic cell of claim 1 wherein the mask prevents physical contact of the anode and cathode.

12. The solid, secondary electrolytic cell of claim 1 wherein the mask covers the entire perimeter of the anode, cathode, or electrolyte surface.

13. A solid secondary electrolytic cell which comprises:

an anode;

a cathode;

a solid electrolyte functionally disposed between said anode and said cathode; and

two masks each comprising an electrically insulative layer that is coated on a surface along the perimeter of said anode, cathode, or solid electrolyte, wherein each mask is fabricated by a process comprising;

(i) depositing a liquid radiation curable material onto said surface; and

(ii) curing said radiation curable material wherein one mask is interposed between the anode and solid electrolyte and the second mask is interposed between the cathode and solid electrolyte.

14. The solid, secondary electrolytic cell of claim 13 wherein one mask is coated on the perimeter of said anode and a second mask is coated on the perimeter of said cathode.

15. The solid, secondary electrolytic cell of claim 14 wherein the length and width of the anode are less than those of the cathode.

16. The solid, secondary electrolytic cell of claim 13 wherein said radiation curable material comprises acrylates.

17. The solid, secondary electrolytic cell of claim 13 wherein each mask has a thickness of about 1 μ

m to about 25 μ

m.

18. The solid, secondary electrolytic cell of claim 13 wherein each mask is substantially impermeable to electrolytic solvents and salts.

19. The solid, secondary electrolytic cell of claim 13 wherein each mask has a depth on each side that is about 0.5 to 10% of the anode, cathode, or solid electrolyte surface dimensions.

20. The solid, secondary electrolytic cell of claim 13 wherein the anode comprises intercalation carbon materials.

21. The solid, secondary electrolytic cell of claim 13 wherein each mask prevents physical contact of the anode and cathode.

22. The solid, secondary electrolytic cell of claim 13 wherein the masks cover the entire perimeter of the anode, cathode, or electrolyte surface.

23. A solid secondary electrolytic cell which comprises:

an anode;

a cathode;

a solid electrolyte functionally disposed between said anode and said cathode; and

a mask comprising an electrically insulative layer that is positioned on a surface along the perimeter of said anode, cathode, or solid electrolyte, wherein the mask comprises a radiation cured material and wherein the mask is interposed between the solid electrolyte and anode or the cathode.

24. The solid, secondary electrolytic cell of claim 23 wherein the length and width of the anode are less than those of the cathode.

25. The solid, secondary electrolytic cell of claim 23 wherein the mask is substantially impermeable to electrolytic solvents and salts.

26. The solid, secondary electrolytic cell of claim 23 wherein the mask has a depth on each side that is about 0.5 to 10% of the anode, cathode, or solid electrolyte surface dimensions.

27. The solid, secondary electrolytic cell of claim 23 wherein the anode comprises intercalation carbon materials.

28. The solid, secondary electrolytic cell of claim 23 wherein the mask prevents physical contact of the anode and cathode.

29. The solid, secondary electrolytic cell of claim 23 wherein the anode comprises intercalation carbon material.

30. The solid, secondary electrolytic cell of claim 23 wherein the mask covers the entire perimeter of the anode, cathode or electrolyte surface.

31. The solid, secondary electrolytic cell of claim 23 wherein the mask has a thickness of about 1 μ

m to about 25 μ

m.