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Waterborne fluoropolymer composition

Inactive Publication Date: 2012-01-19
ARKEMA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0051]The aqueous electrode composition of the present invention has an advantage in processing, in that water has a boiling point lower than the commonly used solvents for PVDF, and thus can be dried faster, or at a lower temperature than solvent-based PVDF compositions, and lower than compositions containing PTFE. Process temperatures of 150° C. or less, 120° C. or less, 100° C. or less and even 90° C. or less may be used and result in a useful electrode.

Problems solved by technology

An organic-solvent-based slurry presents safety, health and environmental dangers.
Organic solvents are generally toxic and flammable, volatile in nature, and involve special manufacturing controls to mitigate and reduce environmental pollution and safety risks.
Moreover, the large carbon footprint associated with use of organic solvents, is not environmentally desirable.
The patent fails to teach or suggest the use of any fugitive adhesion promoters, and specifically the use of organic carbonates in the latex to provide and facilitate interconnectivity in the electrode that is non-reversible.
As a result, PTFE particles are not able to soften, flow, and adhere to powdery particles to provide interconnectivity within an electrode.
Additionally, PTFE and its blends with other fluoropolymers do not meet some of the criteria needed as a viable binder, including the stability needed for waterborne fluoropolymer dispersion.
Moreover, PTFE binders do not provide sufficient interconnectivity in electrodes which is non-reversible.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

Synthesis of Waterborne Fluoropolymer:

[0054]Into an 80-gallon stainless steel reactor was charged, 345 lbs of deionized water and 250 grams of Pluronic 31R1 non-ionic surfactant (from BASF). Following evacuation, agitation was begun at 23 rpm and the reactor was heated to 100° C. After reactor temperature reached the desired set point, 0.6 lbs propane was charged into the reactor. Reactor pressure was then raised to 650 psi by charging about 35 lbs vinylidene fluoride (VDF) into the reactor. After the reactor pressure was stabilized, 5.2 lbs of an aqueous initiator solution containing 1 wt % potassium persulfate and 1 wt % sodium acetate was added to the reactor to jumpstart polymerization. The rate of further addition of initiator solution was so adjusted to obtain and maintain a VDF polymerization rate of roughly 70 pounds per hour. The VDF homopolymerization was continued until 100 lbs of VDF was fed to reactor, at this point a 1 wt % aqueous solution of sodium lauryl sulfate (SL...

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Abstract

This invention relates to a waterborne fluoropolymer composition useful for the fabrication of Li-Ion-Battery (LIE) electrodes. The fluoropolymer composition contains an organic carbonate compound, which is more environmentally friendly than other fugitive adhesion promoters currently used in waterborne fluoropolymer binders. An especially useful organic carbonate compound is ethylene carbonate (EC) and vinylene carbonate (VC), which are solids at room temperature, and other carbonates which are liquid at room temperature such as propylene carbonate, methyl carbonate and ethyl carbonate. The composition of the invention is low cost, environmentally friendly, safer, and has enhanced performance compared to current compositions.

Description

[0001]This application is a continuation-in-put of copending U.S. application Ser. No. 12 / 788,427, filed May 27, 2010, from which priority is claimed. This application also claims benefit, under U.S.C.§119(e) of U.S. Provisional Application No. 61 / 182364, filed May 29, 2009. The cited references are incorporated herein by reference.FIELD OF THE INVENTION[0002]This invention relates to a waterborne fluoropolymer composition useful for the fabrication of Li-Ion-Battery (LIB) electrodes. The fluoropolymer composition contains an organic carbonate compound, which is more environmentally friendly than other fugitive adhesion promoters currently used in waterborne fluoropolymer binders. An especially useful organic carbonate compound is ethylene carbonate (EC) and vinylene carbonate (VC), which are solids at room temperature, and other carbonates which are liquid at room temperature such as propylene carbonate, methyl carbonate and ethyl carbonate. The composition of the invention is low ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01G4/008H01B1/12H01B1/24H01M4/13B32B27/06
CPCH01G11/30H01G11/38H01M4/0404H01M4/62H01M4/623Y02E60/122H01M10/0525H01G11/48Y02E60/13H01M4/131H01M4/133H01M4/136H01G11/26H01M4/1391H01M4/621C08K5/1565Y10T428/3154Y02E60/10Y02P70/50H01G11/52C09D127/16H01M50/411H01M50/449C08L27/16F04C15/0096
Inventor AMIN-SANAYEI, RAMINGABOURY, SCOTT
Owner ARKEMA INC
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