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A bipolar plate for a flow battery and its preparation and application

A bipolar plate and composite plate technology, which is applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of unsatisfactory stacking mechanical properties, difficulty in forming and processing, and reduced fluidity, so as to achieve easy batch preparation and improve Assembly conditions, the effect of increasing the content of conductive filler

Active Publication Date: 2020-02-21
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

In order to prepare a carbon-plastic composite bipolar plate material with a bulk conductivity higher than 10S / cm, the mass fraction of conductive fillers should usually reach more than 60%. At this time, since the polymer matrix contains a large amount of conductive fillers, the viscosity increases and the flow On the one hand, it will cause difficulty in forming and processing; on the other hand, the prepared bipolar plate is brittle and cannot meet the requirements of mechanical properties for stacking, especially in terms of toughness.

Method used

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  • A bipolar plate for a flow battery and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh respectively 0.5kg of polypropylene (melt index is 5), 0.8kg of graphite powder, 0.7kg of carbon black, 10g of polyethylene wax, and 10g of zinc stearate, and add them to the internal mixer, the internal mixing temperature is 220°C, the rotor The rotating speed is 50r / min, and the banburying time is 20 minutes. Then, the evenly mixed banbury material is pulverized by a pulverizer and sent to a single-screw extruder. The barrel temperature of the extruder is 200°C, the speed of the main engine is 10rpm, and the die temperature is 190°C. The sheet is extruded and calendered. A carbon-plastic composite bipolar plate with a thickness of 1mm was formed.

[0026] The electrical conductivity, contact resistance and mechanical properties of the bipolar plate of this embodiment and the carbon-plastic composite plate in each comparative example were tested respectively, and the results are listed in Table 1. Compared with Comparative Examples 1 and 2, the electrical conduct...

Embodiment 2

[0029] Weigh respectively 0.4kg of polypropylene (melt index is 3), 1.0kg of graphite powder, 0.6kg of carbon black, 15g of paraffin wax, 5g of stearic acid, and add them to the internal mixer, the internal mixing temperature is 230°C, and the rotor speed is 50r / min, the mixing time is 20 minutes. Then put the evenly mixed banbury into a mold, and send it into a hot pressing machine. The hot pressing temperature is 210° C., the hot pressing pressure is 50 MPa, and the hot pressing time is 3 minutes. Finally, a carbon-plastic composite bipolar plate with a thickness of 1 mm was obtained by hot pressing.

Embodiment 3

[0031] Weigh respectively 0.6 kg of polypropylene (melt index is 10), 1 kg of graphite powder, 0.4 kg of carbon black, 5 g of polyethylene wax, and 5 g of zinc stearate, and add them to the internal mixer, the internal mixing temperature is 220 ° C, the rotor speed 50r / min, banburying time 20 minutes. Then put the evenly mixed banbury into a mold, and send it into a hot pressing machine. The hot pressing temperature is 200° C., the hot pressing pressure is 30 MPa, and the hot pressing time is 10 minutes. Finally, a carbon-plastic composite bipolar plate with a thickness of 1 mm was obtained by hot pressing.

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Abstract

The invention relates to a bipolar plate of a liquid flow battery and its preparation method and application. The bipolar plate is a carbon-plastic composite plate composed of polypropylene with a melt index of 2-10, a conductive filler and a lubricant, or is made of A carbon-plastic composite board composed of polypropylene with a melt index of 2‑10 and conductive fillers, the mass fraction of polypropylene is 15‑35%, the mass fraction of conductive filler is 65‑85%, and the mass fraction of lubricant is 0‑2 %. The bipolar plate solves the problem of poor toughness of the carbon-plastic composite bipolar plate with high content of conductive fillers, so it has high conductivity and good toughness, and can reduce the body resistance and contact resistance of the bipolar plate on the premise of ensuring the stack assembly , thereby reducing the ohmic internal resistance of the flow energy storage battery.

Description

technical field [0001] The invention relates to the field of bipolar plate materials for a flow battery, in particular to a bipolar plate of an all-vanadium 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 security, 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 bipolar pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0226H01M8/18C08L23/12C08L23/06C08L91/06C08K3/04C08K5/098C08K7/24
CPCY02E60/50
Inventor 刘涛张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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