Battery separator and its constructing method, and lithium-ion battery

• US 9,620,759 B2
• Filed: 12/31/2013
• Issued: 04/11/2017
• Est. Priority Date: 08/01/2011
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Le, Bin
• Primary Examiner(s): RUDDOCK, ULA CORINNA
• Assistant Examiner(s): Parsons, Thomas
• Application Number:
  US14/144,788
• Publication Number:
  US 20140113174A1
• Time in Patent Office: 1,197 Days
• 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 50/403 Manufacturing processes of separators, membranes or diaphragms
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/446 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/449 having a layered structure
• CPC Class Codes: H01M 50/489 Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery separator includes: a basement layer that comprises polyolefin and/or nonwoven fabric; a composite layer that is disposed on at least one surface of the basement layer, where the composite layer comprises polymer adhesive, and boride powder and ceramic powder that are dispersed in the polymer adhesive. An embodiment of the present invention also provides a method for constructing a battery separator and a lithium-ion battery. In the battery separator provided by the embodiment of the present invention, by adding the boride powder, the battery separator may prevent electrolyte deterioration, thereby improving the battery cycle performance; by adding the ceramic powder, reliability may be enhanced for heat resistance of the battery separator and security of the battery.

Claims

1. A battery separator, comprising:

a basement layer that comprises polyolefin and/or nonwoven fabric;

a composite layer disposed on at least one surface of the basement layer, wherein the composite layer comprises polymer adhesive, and boride powder and ceramic powder that are dispersed in the polymer adhesive.

2. The battery separator according to claim 1, wherein a weight rate that each element in the composite layer accounts for the composite layer is:

the boride powder;

approximately 1-10%;

the ceramic powder;

approximately 80-98%;

the polymer adhesive;

approximately 1-10%.

3. The battery separator according to claim 1, wherein:

sizes of the boride powder and the ceramic powder are between approximately 0.001 micrometers and approximately 25 micrometers.

4. The battery separator according to claim 2, wherein:

the boride powder comprises at least one selected from a group consisting of;

calcium hexaboride, titanium diboride, chromium diboride, and aluminum diboride.

5. The battery separator according to claim 1, wherein:

the ceramic comprises at least one selected from a group consisting of;

aluminum silicate, silicon nitride, zirconium diboride, and boron carbide.

6. The battery separator according to claim 1, wherein:

the polymer adhesive comprises vinyl polymer or vinyl copolymer, or a combination of the two.

7. The battery separator according to claim 6, wherein:

the polymer adhesive comprises one or a combination of poly (vinylidene difluoride), polyacrylonitrile, polyethylene oxide, poly-propylene oxide, polymethyl methacrylate, polyvinyl acetate, and poly (vinyldiene fluoride-co-hexafluoropropylene).

8. A lithium-ion battery, comprising:

a positive electrode, a negative electrode, a battery separator, a lithium electrolyte and a battery case;

wherein the battery separator comprises;

a basement layer that comprises polyolefin and/or nonwoven fabric; and

a composite layer disposed on at least one surface of the basement layer, wherein the composite layer comprises polymer adhesive, and boride powder and ceramic powder that are dispersed in the polymer adhesive.

9. The lithium-ion battery according to claim 8, wherein a weight rate that each element in the composite layer accounts for the composite layer is:

the boride powder;

approximately 1-10%;

the ceramic powder;

approximately 80-98%;

the polymer adhesive;

approximately 1-10%.

10. The lithium-ion battery according to claim 8, wherein:

sizes of the boride powder and the ceramic powder are between approximately 0.001 micrometers and approximately 25 micrometers.

11. The lithium-ion battery according to claim 9, wherein:

the boride powder comprises at least one selected from a group consisting of;

calcium hexaboride, titanium diboride, chromium diboride, and aluminum diboride.