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Fluoropolymer binder coating for use in electrochemical devices

A polymer and binder technology, used in coatings, circuits, capacitors, etc., to solve problems such as poor dry adhesion, reduced crystallinity, and damage to the mechanical strength of the binder

Pending Publication Date: 2020-12-08
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, these highly crystalline fluoropolymers have poor dry adhesion
Functional polymers provide good dry adhesion, but have reduced crystallinity, thus compromising the mechanical strength of the adhesive

Method used

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  • Fluoropolymer binder coating for use in electrochemical devices
  • Fluoropolymer binder coating for use in electrochemical devices
  • Fluoropolymer binder coating for use in electrochemical devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0107] The core-shell polymer is formed by the emulsion method, in which a reactor is filled with deionized water, a water-soluble surfactant capable of emulsifying the reactant mass during polymerization, and optionally an antifouling paraffin. The mixture is stirred and deoxygenated.

[0108] A predetermined amount of chain transfer agent (functional and / or non-functional) is then introduced into the reactor, the reactor temperature is raised to the desired level, and vinylidene fluoride (VDF) or VDF is mixed with other fluorine-containing mono together into the reactor. Once the initial charge of monomer / monomer mixture is introduced and the pressure in the reactor reaches the desired level, the initiator solution is introduced to start the polymerization reaction. The reaction temperature may vary according to the nature of the initiator used, and those skilled in the art will know how to adjust. Typically, the temperature is about 30°C to 130°C, preferably about 50°C to...

Embodiment 3

[0118] Example 3: Functional Group

[0119] 345 pounds of deionized water, 270 grams of PLURONIC 31R1 (a non-fluorinated nonionic surfactant from BASF) were charged to an 80 gallon stainless steel reactor. After evacuation, stirring was started at 23 rpm (rotation per minute) and the reactor was heated. After the reactor temperature reached the desired set point of 100°C, VDF and HFP monomers were introduced into the reactor at a HFP ratio of 22.3 wt% of the total monomers. The reactor pressure was then raised to 650 psi by feeding approximately 35 lbs of all monomer into the reactor. After the reactor pressure had stabilized, 3.5 lbs of an initiator solution made of 1.0 wt. % potassium persulfate and 6.0 wt. Reactor to initiate polymerization and introduce functional groups. After initiation, the HFP to VDF ratio was adjusted to achieve 8% HFP relative to the total monomer in the feed. The rate of further addition of the initiator solution was also adjusted to achieve a...

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Abstract

The invention relates to a fluoropolymer coating composition that can be used, for example, in coating electrodes and / or separators in electrochemical devices. The fluoropolymer coating composition preferably contains multiple fluoropolymer phases. The coated electrodes and / or separators have both excellent wet adhesion, excellent dry adhesion, and low leachables. Each of the fluoropolymer phasescontains polymers having at least 10 weight percent, of a common fluoromonomer, making the polymer phases compatible with each other, and allowing for the phases to be distributed fairly homogeneouslyon a macroscopic level throughout the composition and dried coating formed from the composition.

Description

[0001] field of invention [0002] The present invention relates to fluoropolymer binder compositions which may be used, for example, to coat electrodes and / or separators in electrochemical devices. The fluoropolymer coating composition preferably contains multiple fluoropolymer phases. Coatings on electrodes and / or separators exhibit excellent wet adhesion, excellent dry adhesion, and low leachables. These properties can be optimized by adjusting the polymer properties (eg, crystallinity, functionality, crosslinking, branching, and comonomer(s)) of each phase. Phases that provide excellent wet adhesion have low swelling properties, which can be achieved, for example, by high levels of crystallinity, and phases that provide excellent dry adhesion are softer and more swellable in the electrolyte. Softness and higher swellability can be achieved by incorporating comonomer units and / or functional groups. Each fluoropolymer phase comprises a polymer having at least 10% by weight ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/52H01M2/16H01M50/443H01M50/451H01M50/489
CPCH01M50/449H01M50/426H01M50/446H01M50/489H01M50/403H01M10/4235H01G11/52H01G11/84H01M4/60Y02E60/10H01G11/38H01G11/50H01G11/46H01G11/06H01G11/28H01M50/451H01M50/443H01M4/623C08L27/16C09D1/00C09D127/16C08L2203/206C08L2207/02C08L2207/53
Inventor R·阿明-萨纳伊S·巴克斯特T·范刘瑜洁
Owner ARKEMA FRANCE SA