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Compositions for bipolar plates and processes for manufacturing said compositions

A composition, polymer technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, application, etc., can solve the problems of reduced surface conductivity, low conductivity, etc., to achieve the effect of improved conductivity and easy application

Pending Publication Date: 2021-04-13
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, surface conductivity is reduced and additional surface preparation steps are required to remove this less conductive layer

Method used

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  • Compositions for bipolar plates and processes for manufacturing said compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0030] According to various embodiments, the composition comprises the following features, in combination where appropriate.

[0031] The composition may be in powder form, and in this case the conductive fluoropolymer particles are mixed with the second conductive filler particles.

[0032] According to another embodiment, the composition may be in the form of an agglomerated solid, and in this case the second conductive filler particles are bound to the particles (or regions) of the conductive fluoropolymer. It is in this agglomerated form that the composition is shaped into a bipolar plate.

[0033] Dispersing the first conductive filler in the fluoropolymer renders the fluoropolymer conductive. When the electrical resistance of a fluoropolymer filament produced, for example using a capillary rheometer, is less than 10 6 ohms, the polymer is considered conductive. Preferably, the loading of the first conductive filler is such that a permeation threshold through the fluor...

Embodiment

[0088] product:

[0089] PVDF1: a homopolymer of vinylidene fluoride sold by Arkema and characterized by, in 100 s measured by capillary rheometry -1 And the viscosity at 230°C is 300 Pa.s.

[0090] PVDF2: Vinylidene fluoride homopolymer characterized in that measured by capillary rheology in 100s -1 And the viscosity at 230°C is 60Pa.s.

[0091] PVDF3: Vinylidene fluoride homopolymer characterized in that measured by capillary rheology in 100s -1 And the viscosity at 230°C is 2000Pa.s.

[0092] Carbon black: by Imerys under the name Conductive carbon black sold at 260G with a specific surface area of ​​70m 2 / g.

[0093] Graphite: Grade 70200 from Richard Anton Company.

[0094] Preparation of conductive PVDF formulations

[0095] PVDF and carbon black mixtures were prepared by extrusion using a BUSS 15D co-kneader. Formulations were prepared using a flow rate of 15 kg / h, a screw speed of 285 rpm and a temperature of 220°C.

[0096] The conductive PVDF pellets ...

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Abstract

The present invention relates to new compositions for bipolar plates and processes for manufacturing said compositions. More particularly, the invention relates to a process for manufacturing a composition, comprising the following steps: - mixing a thermoplastic polymer in the molten state with a first conductive filler in order to obtain a conductive thermoplastic polymer; - grinding said conductive thermoplastic polymer in order to reduce it to powder; - mixing the conductive thermoplastic polymer powder with a second conductive filler.

Description

technical field [0001] The present invention relates to a novel composition for bipolar plates, a method of manufacturing said composition, a bipolar plate obtained from said composition and a method of manufacturing said plate by injection. Background technique [0002] Bipolar plates are used in fuel cells and redox flow batteries. They can be made from a variety of materials: metallic bipolar plates, graphite plates, and carbon-polymer composite plates. [0003] The principle of bipolar plates based on organic composites is based on the use of conductive fillers (carbon, graphite, etc.) dispersed in thermoplastic or thermosetting polymers. The filler provides the bipolar plate with the electrical conductivity needed to collect current, and the polymer matrix provides the bipolar plate with the proper mechanical strength needed to assemble the various components. [0004] Carbon-polymer composite bipolar plates have favorable properties: high electrical conductivity, goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/20C08K3/04C08L27/12H01B1/20H01M8/0202H01M8/0221H01M8/0226C08J3/12
CPCH01M8/0221H01M8/0226C08J3/201C08J3/203C08J2327/12C08J2327/16C08K3/04H01B1/24H01M8/0213C08K3/013C08K2201/001C08K3/041C08K3/042C08K7/06Y02P70/50Y02E60/50C08L27/12C08J3/12C08K2201/01B29C45/0001B29K2027/16B29K2105/0023B29L2031/3468C08K2201/014H01M8/184
Inventor S.比泽特J.乔韦奥
Owner ARKEMA FRANCE SA