Binders, electrolytes and separator films for energy storage and collection devices using discrete carbon nanotubes

Patent metadata

Field	Value
Publication number	US-10608282-B2
Application number	US-201815881071-A
Country	US
Kind code	B2
Filing date	Jan 26, 2018
Priority date	Jun 21, 2012
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

In various embodiments an improved binder composition, electrolyte composition and a separator film composition using discrete carbon nanotubes. Their methods of production and utility for energy storage and collection devices, like batteries, capacitors and photovoltaics, is described. The binder, electrolyte, or separator composition can further comprise polymers. The discrete carbon nanotubes further comprise at least a portion of the tubes being open ended and/or functionalized. The utility of the binder, electrolyte or separator film composition includes improved capacity, power or durability in energy storage and collection devices. The utility of the electrolyte and or separator film compositions includes improved ion transport in energy storage and collection devices.

First claim

What is claimed is the following:

1. A composition for use as a binder material, an electrolyte material or a separator film material of an energy storage or collection device, comprising:
a plurality of discrete carbon nanotube fibers, said fibers having an aspect ratio of from about 10 to about 500, and wherein at least a portion of the discrete carbon nanotube fibers are open ended and

wherein 40% to 90% by number of the discrete carbon nanotubes have an aspect ratio of 30-70 and wherein from 1% to 30% by number of discrete carbon nanotubes have an average aspect ratio 80-140.

2. The composition of claim 1 , wherein the portion of discrete carbon nanotubes that are open ended are ion conducting.

3. The composition of claim 2 , further comprising additional inorganic structures comprising elements of the groups two through fourteen of the Periodic Table of Elements.

4. The composition of claim 2 , further comprising non-fiber carbon structures selected from the group consisting of carbon black, graphite, graphene, oxidized graphene, fullerenes, and mixtures thereof.

5. The composition of claim 1 , further comprising at least one polymer.

6. The composition of claim 5 , wherein the polymer is selected from the group consisting of vinyl polymers, poly(styrene-butadiene), partially or fully hydrogenated poly(styrene butadiene) containing copolymers, functionalized poly(styrene butadiene) copolymers such as carboxylated poly(styrene butadiene), poly(styrene-isoprene), poly(methacrylic acid), poly(methylmethacrylate), poly(acrylic acid), poly(vinylalcohols), poly(vinylacetates), fluorinated polymers, polyvinylpyrrolidone, conductive polymers, polymers derived from natural sources, polyethers, polyesters, polyurethanes, and polyamides; homopolymers, graft, block or random co- or ter-polymers, and mixtures thereof.

7. The composition of claim 1 , wherein the carbon nanotubes are further functionalized.

8. The composition of claim 1 , further comprising at least one dispersion aid.

9. The composition of claim 1 , further comprising at least a portion of discrete carbon nanotubes interspersed between graphene and/or oxidized graphene plates.

10. The composition of claim 1 , wherein the binder material has an impedance of less than or equal to about one billion ohm-m.

11. The composition of claim 1 , where the electrolyte material or separator film has a charge transfer resistance of less than or equal to about 10 million ohm-m.

12. The composition of claim 1 , wherein the carbon nanotubes are oriented.

13. The composition of claim 12 , wherein the orientation is accomplished in a sheet, micro-layer, micro-layer with vertical film orientation, film, molding, extrusion, or fiber spinning fabrication method.

14. The composition of claim 12 , wherein orientation includes post fabrication methods, such as tentering, uniaxial orientation, biaxial orientation and thermoforming.

15. The composition of claim 1 , which further comprises electrolyte.

16. The composition of claim 15 , wherein the electrolyte comprises a polymer or a liquid.

Assignees

• Molecular Rebar Design Llc

Inventors

• Bosnyak Clive P
• Swogger Kurt W
• Marinkovic Milos

Classifications

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/14

  Electrodes for lead-acid accumulators · CPC title

• Y10T428/24995

  Two or more layers · CPC title

• H01G11/56

  Solid electrolytes, e.g. gels; Additives therein · CPC title