Advanced separators based on aromatic polymer for high energy density lithium batteries

Patent metadata

Field	Value
Publication number	US-9598545-B2
Application number	US-201313755823-A
Country	US
Kind code	B2
Filing date	Jan 31, 2013
Priority date	Jan 31, 2013
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A process includes casting a solution including poly(phenylene oxide), inorganic nanoparticles, a solvent, and a non-solvent on a substrate; and removing the solvent to form a porous film; wherein: the porous film is configured for use as a porous separator for a lithium ion battery.

First claim

What is claimed is:

1. A process for forming a porous film separator on the surface of an electrode, the process comprising:
casting a solution comprising poly(phenylene oxide), inorganic nanoparticles, a solvent, and a non-solvent on the electrode, wherein the electrode comprises an electroactive material and a current collector; and
removing the solvent to form the porous film separator on the surface of the electrode;
wherein:
the inorganic nanoparticles have an average particle size of from about 1 nm to about 100 nm;
the solvent is selected from the group consisting of a halogenated solvent, benzene, xylene, toluene, and a mixture of any two or more thereof; and
the non-solvent is selected from the group consisting of an alcohol, acetone, N,N-dimethylformamide, N-Methyl-2-pyrrolidone, N,N-dimethylacetamide, and a mixture of any two or more thereof.

2. The process of claim 1 , wherein a volume ratio of non-solvent to solvent is from about 0.001 to about 0.30.

3. The process of claim 1 , wherein a volume ratio of non-solvent to solvent is from about 0.1 to about 0.2.

4. The process of claim 1 , wherein the solvent comprises a halogenated solvent selected from the group consisting of chloroform, methylene chloride, carbon tetrachloride, chlorobenzene, dichlorobenzene, or a mixture of any two or more thereof.

5. The process of claim 1 , wherein the non-solvent comprises an alcohol and the alcohol is selected from the group consisting of n-propanol, n-butanol, n-pentanol, n-hexanol, n-heptanol, n-octanol, isomers thereof, or a mixture of any two or more alcohols or isomers thereof.

6. The process of claim 1 , wherein the inorganic nanoparticles are silica nanoparticles, alumina nanoparticles, or a combination thereof.

7. The process of claim 1 further comprising drying the porous film separator.

8. The process of claim 1 , wherein the inorganic nanoparticles are present from about 1 wt % to about 50 wt % with regard to the poly(phenylene oxide).

9. The process of claim 1 , wherein the inorganic nanoparticles are present from about 5 wt % to about 20 wt % with regard to the poly(phenylene oxide).

10. The process of claim 1 , wherein the inorganic nanoparticles are present from about 10 wt % to about 20 wt % with regard to the poly(phenylene oxide).

11. The process of claim 1 further comprising forming a second porous film on the porous film, the forming comprising casting a second solution comprising poly(phenylene oxide), inorganic nanoparticles, a solvent, and a non-solvent on the porous film separator; and removing the solvent to form a two-layer porous film.

12. The process of claim 1 , wherein the poly(phenylene oxide) is poly(2,6-dimethyl-1,4-phenylene oxide).

Assignees

• Uchicago Argonne Llc

Inventors

• Zhang Zhengcheng
• Woo Jung-Je
• Amine Khalil

Classifications

• H01M50/457

  comprising three or more layers · CPC title

• H01M2/166

  Electricity · mapped topic

• C08J5/2256

  based on macromolecular compounds obtained by reactions other than those involving carbon-to-carbon bonds, e.g. obtained by polycondensation · CPC title

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title