Lithium cell having an alkaline-earth metal carboxylate separator

Patent metadata

Field	Value
Publication number	US-10109890-B2
Application number	US-201414911492-A
Country	US
Kind code	B2
Filing date	Aug 4, 2014
Priority date	Aug 16, 2013
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A lithium cell includes a negative electrode and a positive electrode. In order to increase the safety and service life of the cell, the cell also includes at least one porous protective layer arranged between the negative electrode and the positive electrode. The protective layer includes at least one alkaline-earth metal carboxylate.

First claim

The invention claimed is:

1. A lithium cell, comprising:
a negative electrode;
a positive electrode; and
at least one porous protective layer disposed between the negative electrode and the positive electrode, the at least one protective layer comprising a particle form of at least one alkaline-earth metal carboxylate in a porous portion of the at least one porous protective layer.

2. The lithium cell of claim 1 , wherein the at least one protective layer comprises at least one binder.

3. The lithium cell of claim 1 , wherein the at least one alkaline-earth metal carboxylate has an average particle diameter in a range from ≥40 nm to ≤2 μm.

4. The lithium cell of claim 1 , wherein the at least one protective layer has a layer thickness in a range from ≥0.5 μm to ≤20 μm.

5. The lithium cell of claim 1 , wherein the at least one protective layer includes at least one calcium carboxylate.

6. The lithium cell of claim 2 , wherein the at least one binder includes a fluorinated polymer.

7. The lithium cell of claim 1 , wherein:
the at least one protective layer further comprises at least one ceramic material, and
the at least one alkaline-earth metal carboxylate and the at least one ceramic material are in the form of a mixture.

8. The lithium cell of claim 1 , further comprising a separator disposed between the negative electrode and the positive electrode.

9. The lithium cell of claim 8 , wherein at least one of the separator, the positive electrode, and the negative electrode is covered with the at least one protective layer.

10. The lithium cell of claim 8 , wherein the separator is covered, on one side or both sides with the at least one protective layer.

11. The lithium cell of claim 8 , wherein the separator is a polymer separator.

12. The lithium cell of claim 1 , wherein the positive electrode comprises a lithium-manganese spinel.

13. An electrode for a lithium cell, comprising:
at least one porous protective layer including a particle form of at least one alkaline-earth metal carboxylate in a porous portion of the at least one porous protective layer.

14. The electrode of claim 13 , wherein the at least one protective layer further includes at least one binder.

15. The electrode of claim 13 , wherein the at least one protective layer has a layer thickness in a range from ≥0.5 μm to ≤20 μm.

16. The lithium cell of claim 5 , wherein the at least one calcium carboxylate is calcium acetate.

17. The lithium cell of claim 11 , wherein the separator is a polyolefin separator.

18. The electrode of claim 13 , wherein the at least one alkaline-earth metal carboxylate is calcium carboxylate.

19. The electrode of claim 14 , wherein the at least one binder is a fluorinated polymer.

20. A separator for disposing between a negative electrode and a positive electrode of a lithium cell, the separator comprising:
at least one porous protective layer including a particle form of at least one alkaline-earth metal carboxylate in a porous portion of the at least one porous protective layer.

Assignees

• Bosch Gmbh Robert

Inventors

• Wöhrle Thomas
• Eberle Felix
• Wurm Calin Iulius
• Ogihara Hideki

Classifications

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/426

  Fluorocarbon polymers · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title