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Bipolar plate for flow battery and preparation and application thereof

A technology of liquid flow battery and zinc-bromine flow battery, which is applied in the direction of battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of inability to seal and insufficient welding strength, so as to reduce the internal resistance of the battery and increase the power of the battery Effects of Density, High Toughness and Tensile Strength

Active Publication Date: 2020-04-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prepare a carbon-plastic composite bipolar plate material with a bulk conductivity higher than 5S / cm, the mass fraction of conductive filler should reach more than 50%. At this time, since the polymer matrix contains a large amount of conductive filler, laser welding, ultrasonic The welding strength is not high enough when welding with the electrode frame by welding and other methods, and it cannot play the role of sealing

Method used

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  • Bipolar plate for flow battery and preparation and application thereof
  • Bipolar plate for flow battery and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh respectively high-density polyethylene (melt index is 0.05) 0.58kg, polypropylene (melt index is 0.05) 0.21kg, carbon nanotube 0.2kg, polyethylene wax 5g, zinc stearate 5g, wherein, carbon nanotube diameter 20-30nm, length 15-50μm, purity 99%, specific surface area 160m 2 / g. Mix the above materials and put them into the internal mixer, the internal mixing temperature is 200°C, the rotor speed is 40

[0030] r / min, banburying time 20 minutes. Then, the evenly mixed banbury material is pulverized by a pulverizer and sent to a single-screw extruder. The temperature of the barrel of the extruder is 200°C, the speed of the main engine is 15rpm, and the temperature of the die is 230°C. The sheet is extruded and calendered. A carbon-plastic composite bipolar plate with a thickness of 1mm was formed.

Embodiment 2

[0032] Take high-density polyethylene (melt index is 0.5) 0.49kg respectively, polypropylene (melt index is 0.5) 0.21kg, carbon nanotube 0.15kg, conductive carbon black 0.15kg, paraffin 5g, stearic acid 5g; Wherein, carbon The diameter of the nanotube is 15-30nm, the length is 15-30μm, the purity is 99%, and the specific surface area is 200m 2 / g; the particle size of conductive carbon black is 30nm, and the specific surface area is 250m 2 / g. After mixing the above materials, put them into a banbury mixer, the banbury temperature is 230°C, the rotor speed is 45r / min, and the banbury time is 20 minutes. Then, the evenly mixed banbury material is pulverized by a pulverizer and sent to a single-screw extruder. The temperature of the barrel of the extruder is 220°C, the speed of the main engine is 10rpm, and the temperature of the die is 200°C. The sheet is extruded and calendered. A carbon-plastic composite bipolar plate with a thickness of 1mm was formed.

Embodiment 3

[0034] Take by weighing high-density polyethylene (melt index is 1) 0.4kg, polypropylene (melt index is 2) 0.28kg, carbon nanotube 0.2kg, conductive carbon black 0.1kg, polyethylene wax 10g, calcium stearate 10g, Among them, carbon nanotubes have a diameter of 20-30nm, a length of 15-50μm, a purity of 99%, and a specific surface area of ​​160m 2 / g. After mixing the above materials, put them into the banbury mixer, the banbury temperature is 220°C, the rotor speed is 50r / min, and the banbury time is 20 minutes. Then, the homogeneous mixing material is pulverized by a pulverizer and sent to a single-screw extruder. The temperature of the barrel of the extruder is 230°C, the speed of the main engine is 8rpm, and the temperature of the die is 200°C. The sheet is extruded and calendered. A carbon-plastic composite bipolar plate with a thickness of 1mm was formed.

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Abstract

The invention relates to a bipolar plate for a flow battery and preparation and application thereof. The bipolar plate for the flow battery is composed of high-density polyethylene, polypropylene, carbon nanotubes, conductive carbon black and a lubricant, or is composed of high-density polyethylene, polypropylene, carbon nanotubes and a lubricant, wherein the mass fraction of the high-density polyethylene is 40-60%, the mass fraction of the polypropylene is 20-40%, the mass fraction of the carbon nanotubes is 10-35%, the mass fraction of the conductive carbon black is 0-24%, and the mass fraction of the lubricant is 0.1-2%. The bipolar plate has relatively high conductivity while keeping high polymer content, and can ensure enough high welding strength when being welded with an electrode frame, so that the sealing reliability of an electric pile is ensured.

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] Due to its independent output power and capacity, the all-vanadium redox flow battery has flexible system design; high energy efficiency, long life, high operation stability and reliability, and low self-discharge; large degree of freedom in site selection, no pollution, and simple maintenance. With the advantages of low operating cost and high safety, it has broad development prospects in large-scale energy storage. It is considered to be an effective method to solve the random and intermittent unsteady characteristics of renewable energy power generation systems such as solar energy and wind energy. There are significant demands in power generation and smart grid construction. [0003] As a key component of the flow battery, the bip...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/0273H01M8/0276H01M8/18
CPCH01M4/8652H01M4/8875H01M8/188H01M8/0273H01M8/0276H01M2004/8694Y02E60/50
Inventor 刘涛李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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