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Composite conductive plate and its preparation method and application

A technology of composite conductive and conductive layers, applied in the direction of circuits, fuel cells, electrical components, etc., can solve the problems of low mechanical strength such as tensile strength, low efficiency of bipolar plate batteries, and increase the risk of bipolar plates, etc., to achieve mechanical strength Good, excellent electrical conductivity, simple processing technology

Active Publication Date: 2020-11-06
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In 2013, the Fraunhofer Institute of Chemistry in Germany and the Finnish National Technology Research Center (VTT) jointly studied low-anisotropy synthetic graphite particles, polyphenylene sulfide, and an average diameter of 9.5nm. 1.5μm carbon nanotubes and other coupling agents are mixed, and then molded to prepare a bipolar plate with a thickness of 3mm. The bipolar plate prepared by this method has a carbon content of about 72.5% and a bending strength of 70-95MPa , the conductivity in the plane direction is 5-60S / cm, and the conductivity in the thickness direction is 1-20S / cm. The battery efficiency of this bipolar plate is relatively low, at 55mA / cm 2 The energy efficiency is only 40% to 80% at a low current density (Burak Caglar, Peter Fischer, Pertti Kauranen, Mikko Karttunen, Peter Elsner. Development of carbon nanotube and graphite filled polyphenylenesulfide based bipolar plates for all-vanadium redox flow batteries[J]. Journal of Power Sources Volume 256, 2014, pp.88-95)
However, a large number of studies have proved that in the case of high carbon content, the mechanical strength of bipolar plates such as bending strength, impact strength, and tensile strength is low, which will increase the risk of bipolar plate applications

Method used

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  • Composite conductive plate and its preparation method and application

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Effect test

Embodiment 1

[0065] This embodiment provides a battery bipolar plate, including a carbon material conductive layer and a composite conductive plate; the composite conductive plate is arranged between two carbon material conductive layers.

[0066] The parts by weight of the raw materials of the composite conductive plate are as follows:

[0067] 1 carbon nanotube

[0068] Polyethylene 99 parts

[0069] Fiberglass 0 parts

[0070] The upper and lower carbon material conductive layers are made of carbon paper.

[0071] The preparation method of the bipolar plate is as follows: melt polyethylene at 180°C (viscosity is 50000cps), then pre-mix carbon nanotubes and polyethylene melt, cover the upper and lower surfaces with carbon paper, heat the The pressing temperature is 20-250°C, and it is pressed into a thin plate. The prepared bipolar plate has an ASR of 50mΩ˙cm 2 ; The bending strength is 80MPa. In the test of all-vanadium redox single battery, at 100mA / cm 2 , the battery performanc...

Embodiment 2

[0073] This embodiment provides a battery bipolar plate, including a carbon material conductive layer and a composite conductive plate; the composite conductive plate is arranged between two carbon material conductive layers.

[0074] The parts by weight of the raw materials of the composite conductive plate are as follows:

[0075] Carbon nanotubes 40 parts

[0076] Polyimide 40 parts

[0077] 20 parts glass fiber

[0078] The material of the upper and lower carbon conductive layer is pyrolytic carbon.

[0079] The preparation method of the bipolar plate is as follows: pre-mix carbon nanotubes, polyimide solution (N,N-dimethylformamide as solvent, viscosity is 1cps) and glass fiber, then remove the solvent, and finally in the upper and lower surfaces Cover pyrolytic carbon, and press it into a thin plate at a pressure of 0.5-20 MPa and a hot-pressing temperature of 20-250°C. The prepared bipolar plate has an ASR of 48mΩ˙cm 2 ; The bending strength is 82MPa. In the test ...

Embodiment 3

[0081] This embodiment provides a battery bipolar plate, including a carbon material conductive layer and a composite conductive plate; the composite conductive plate is arranged between two carbon material conductive layers.

[0082] The parts by weight of the raw materials of the composite conductive plate are as follows:

[0083] Carbon nanotubes 20 parts

[0084] 70 parts of epoxy resin

[0085] 10 parts glass fiber

[0086] The material of the upper and lower carbon material conductive layers is graphene.

[0087] The preparation method of the bipolar plate is as follows: pre-mix carbon nanotubes, epoxy resin (viscosity at 25°C is 1400cps) and glass fiber, cover the upper and lower surfaces with graphene, press at a pressure of 0.5-20MPa, and hot-press at a temperature of 20- 250 ° C, pressed into a thin plate. The prepared bipolar plate has an ASR of 25mΩ˙cm 2 ; The bending strength is 90MPa. In the test of all-vanadium redox single battery, at 100mA / cm 2 , the ba...

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Abstract

The invention provides a composite conductive board as well as a preparation method and application thereof. The composite conductive board is prepared from the following components in parts by weight: 1-40 parts of carbon material, 40-99 parts of resin and 0-20 parts of reinforced fibers. In the composite conductive board for a flow cell, the carbon content is relatively low and is 40 percent orbelow, the conductivity is very excellent, the mechanical strength is better, the processing technology is relatively simple, and the composite conductive board is hopeful to realize industrial production; the area specific resistance is 5-50 m omega.cm2, and the bending strength is 80-120MPa; and in a single cell test, when the current density is 100mA / cm2, the cell energy efficiency is 79-89 percent.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a composite conductive plate and its preparation method and application. Background technique [0002] The all-vanadium redox flow battery is an energy storage device that realizes the mutual conversion of electrical energy and chemical energy through the electrochemical reaction of vanadium ions in different valence states in the positive and negative electrolytes. Key technologies for building the energy Internet, promoting the reform of the power system, and promoting the development of new energy formats. Ordinary flow battery stacks basically include bipolar plates, plate frames, electrolytes, carbon felts, and proton exchange membranes, among which bipolar plates are one of the main factors that determine battery performance, efficiency and cost (Jaeheon Choe, Jun Woo Lim, Minkook Kim, Jinwhan Kim, Dai GilLee. Durability of graphite coated carbon composite bipolar plates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/18
CPCH01M4/8631H01M4/8657H01M4/8875H01M4/8896H01M8/188Y02E60/50Y02P70/50
Inventor 蒋峰景廖伟能郁盛玮余晴春王斐然周新杰
Owner SHANGHAI JIAOTONG UNIV
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