High melt temperature microporous lithium-ion rechargeable battery separators and methods of preparation and use

Patent metadata

Field	Value
Publication number	US-12431529-B2
Application number	US-202017086831-A
Country	US
Kind code	B2
Filing date	Nov 2, 2020
Priority date	Aug 2, 2010
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

Disclosed or provided are high melt temperature microporous Lithium-ion rechargeable battery separators, shutdown high melt temperature battery separators, battery separators, membranes, composites, and the like that preferably prevent contact between the anode and cathode when the battery is maintained at elevated temperatures for a period of time, methods of making, testing and/or using such separators, membranes, composites, and the like, and/or batteries, Lithium-ion rechargeable batteries, and the like including one or more such separators, membranes, composites, and the like.

First claim

The invention claimed is:

1. A high melt temperature microporous battery separator comprising:
a microporous base membrane and an electrospun nanofiber coating applied to at least one side of said base membrane, the electrospun nanofiber coating comprising nanoscale fibers having a diameter in the range of 10 to 2,000 nanometers and wherein said nanoscale fibers comprise a high glass transition temperature (T g ) polymer or blend having a glass transition temperature (T g ) from 160° C. to 220° C., and wherein said high glass transition temperature (Tg) polymer comprises polyketones and the coated microporous membrane, when in a battery, has a sufficient level of structural integrity to prevent contact between an anode and a cathode when the battery is maintained at >160° C. for at least 5 minutes and allows at least partial functioning of the battery at temperatures from 160° C. to 220° C., and wherein said coating further comprising fumed Alumina, the coating being made from a solution comprising the polymer and a solvent selected from the group consisting of N-methylpyrrolidinone, 1,4 dioxane, and combinations thereof, and wherein at least partial functioning of the battery means that the cathode and the anode are not in contact for a period of at least five minutes.

2. The high melt temperature microporous battery separator of claim 1 wherein said high glass transition temperature (Tg) polymer having a glass transition temperature (Tg) greater than 180 deg C.

3. The high melt temperature microporous battery separator of claim 1 wherein said high glass transition temperature (Tg) polymer being soluble in at least one moderately volatile solvent.

4. The high melt temperature microporous battery separator of claim 1 wherein said microporous membrane comprising a polyolefin selected from the group consisting of: polyethylene, polypropylene, polymethylpentene, and combinations thereof.

5. The high melt temperature microporous battery separator of claim 1 wherein said microporous membrane being manufactured by a dry stretch process or a wet process.

6. The high melt temperature microporous battery separator of claim 1 wherein said microporous membrane being a single layer membrane, a bi-layer membrane, a tri-layer membrane, or a multi-layer membrane.

7. The high melt temperature microporous battery separator of claim 1 wherein said battery separator having a melt temperature of >160 deg C.

8. The high melt temperature microporous battery separator of claim 1 wherein said battery separator having a melt temperature of >250 deg C.

9. A Lithium-ion rechargeable battery including:
at least one high melt temperature microporous battery separator according to claim 1 .

10. The high melt temperature microporous battery separator of claim 1 wherein said high glass transition temperature (Tg) polymer further comprises one or more polymers selected from the group consisting of polyamides, polyaramids, polyimides, polyamideimides, polyvinylidene fluoride and co-polymers of polyvinylidene fluoride.

11. A high melt temperature microporous battery separator comprising:
a microporous base membrane and an electrospun nanofiber coating applied to at least one side of said base membrane, the electrospun nanofiber coating comprising nanoscale fibers having a diameter in the range of 10 to 2,000 nanometers and wherein said nanoscale fibers comprise Alumina and the coating is made from a solution comprising a solvent selected from the group consisting of N-methylpyrrolidinone, 1,4 dioxane, and combinations thereof, and the coated microporous membrane, when in a battery, has a sufficient level of structural integrity to prevent contact between an anode and a cathode when the battery is maintained at >160° C. for at least 5 minutes and allows at least partial functioning of the battery at temperatures from 160° C. to 220° C., and wherein at least partial functioning of the battery means that the cathode and the anode are not in contact for a period of at least five minutes.

Assignees

• Celgard Llc

Inventors

• Wensley C Glen
• Negrete Carlos R
• Watson Jill V

Classifications

• H01M50/443

  Particulate material · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/491

  Porosity · CPC title