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A kind of highly conductive flexible graphite bipolar plate for liquid flow battery and its preparation and application

A liquid flow battery, high conductivity technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problem of high-density materials sinking below, and achieve simple preparation methods, reduce production costs, and increase power density Effect

Active Publication Date: 2020-12-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the filler content of traditional mixers is generally required to be less than 60%, and the material has enough room to move in the barrel. When the powder brought up by the blade falls, it is easy to cause the dense material to sink due to the huge difference in density. under

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 240 g of expanded graphite powder (200 times the expansion ratio, particle size of 300 mesh) and 60 g of PVDF powder, respectively, and put them into the mixer. Then put the mixed powder into the mold and press it at room temperature under 5MPa pressure to make a thickness of 1.5mm and a density of 0.7g / cm 3 of blanks. After that, the blank was taken out and put into a vacuum hot pressing mold for vacuum hot pressing. The hot pressing temperature was 230° C., the pressure was 10 MPa, the heat preservation and pressure holding time was 15 minutes, and the blank was pressed to a thickness of 0.6 mm and a density of 1.75 g. / cm 3 finished bipolar plate.

[0023] The electrical conductivity and mechanical properties of the flexible graphite bipolar plate in this example and the carbon-plastic composite plates in each comparative example were tested respectively. The results are listed in Table 1. Compared with Comparative Examples 1 and 2, the electrical conductivit...

Embodiment 2

[0025] Weigh 240 g of expanded graphite powder (200 times the expansion ratio, particle size of 300 mesh) and 60 g of PVDF powder, respectively, and put them into the mixer. Then put the mixed powder into the mold and press it at room temperature under 5MPa pressure to a thickness of 1mm and a density of 1.05g / cm 3 of blanks. After that, the blank was taken out and sent to a calender for calendering. The roll temperature was 200°C and the rolling line speed was 0.5m / min. The blank is pressed to a thickness of 0.6mm and a density of 1.75g / cm 3 finished bipolar plate.

Embodiment 3

[0027] Weigh 270 g of expanded graphite powder (200 times the expansion ratio, particle size of 300 mesh) and 30 g of PVDF powder, respectively, and put them into the mixer. Then put the mixed powder into the mold and press it at room temperature under 5MPa pressure to make a thickness of 1.5mm and a density of 0.7g / cm 3 of blanks. After that, the blank was taken out and put into a vacuum hot pressing mold for vacuum hot pressing. The hot pressing temperature was 230° C., the pressure was 10 MPa, the heat preservation and pressure holding time was 15 minutes, and the blank was pressed to a thickness of 0.6 mm and a density of 1.75 g. / cm 3 finished bipolar plate.

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PUM

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Abstract

The invention relates to a preparation method of a high-conductivity flexible graphite bipolar plate for a flow battery, which comprises the following steps of: uniformly mixing expanded graphite powder and PVDF powder in a mixer according to a high loading coefficient, carrying out cold pressing to obtain a low-density blank, and carrying out vacuum hot pressing or rolling to obtain the high-density bipolar plate finished product. According to the bipolar plate prepared by the invention, the toughness and the high conductivity of the flexible graphite plate are maintained, the ohmic polarization of the flow battery can be remarkably reduced, and the power density of the flow battery is improved; by adding the polymer, the liquid resistance is improved, the preparation method is simple, and batch preparation is easy.

Description

technical field [0001] The invention relates to the field of liquid flow batteries in chemical energy storage technology, in particular to a bipolar plate of a liquid flow battery and a preparation method thereof. Background technique [0002] All-vanadium redox flow batteries are flexible in system design due to their independent output power and capacity; high energy efficiency, long life, high operational stability and reliability, and low self-discharge; large degree of freedom in location selection, no pollution, and simple maintenance. It has the advantages of low operating cost and high safety, and has broad development prospects in terms of large-scale energy storage. There is a significant need in power generation and smart grid construction. [0003] As the key component of the flow battery, the bipolar plate plays the role of connecting the single cells in series to form a stack. It needs to have good electrical conductivity, liquid resistance, chemical stability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0258H01M8/0213H01M8/18B29C43/56B29C43/02
CPCB29C43/02B29C43/56H01M8/0213H01M8/0258H01M8/188Y02E60/50
Inventor 刘涛李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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