Lithium Cell Having an Alkaline-Earth Metal Carboxylate Separator

• US 20160197380A1
• Filed: 08/04/2014
• Published: 07/07/2016
• Est. Priority Date: 08/16/2013
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Eberle, Felix, Wurm, Calin Iulius, Whrle, Thomas, Ogihara, Hideki
• Granted Patent: US 10,109,890 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/426 Fluorocarbon polymers
• CPC Class Codes: H01M 50/431 Inorganic material
• CPC Class Codes: H01M 50/446 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: H01M 50/457 comprising three or more layers
• CPC Class Codes: H01M 50/46 Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

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.

Claims

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 at least one alkaline-earth metal carboxylate.

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

m.

4. The lithium cell of claim 1, wherein the at least one protective layer has a layer thickness in a range from ≧

0.5 μ

m to ≦

20 μ

m.

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.

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.

13. An electrode for a lithium cell, comprising:

at least one porous protective layer including at least one alkaline-earth metal carboxylate.

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 μ

m to ≦

20 μ

m.

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 at least one alkaline-earth metal carboxylate.