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

A bipolar plate and composite plate technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of brittleness, poor conductivity, and unsuitable stack assembly of the composite plate, and achieve easy production process, reduce body resistance and Effect of contact resistance, high bulk conductivity

Active Publication Date: 2020-11-03
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

However, this material has poor electrical conductivity, in order to improve the conductivity, it is necessary to increase the content of conductive filler in the material
However, too high a conductive filler content will make the composite board brittle and unsuitable for stack assembly

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh respectively 0.3kg of polypropylene (melt index is 20), 0.1kg of polyolefin elastomer (POE), 1.3kg of graphite powder, 0.3kg of carbon black, 10g of polyethylene wax, and 5g of zinc stearate, and add them to the internal mixer , the banburying temperature is 230°C, the rotor speed is 50r / min, and the banburying 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 250° C., the hot pressing pressure is 80 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.

[0033] Test 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 respectively, and the results are listed in Table 1. Compared with Comparative Example 1, the bipolar plate of this embodiment is due to th...

Embodiment 2

[0036] Weigh respectively polypropylene (melt index is 25) 0.3kg, thermoplastic elastomer (TPE) 0.2kg, graphite powder 1.2kg, carbon black 0.3kg, paraffin 15g, stearic acid 5g, join in the internal mixer, banbury The temperature is 200°C, the rotor speed is 50r / min, and the banburying 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 220° 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

[0038] Take respectively polypropylene (melt index is 30) 0.25kg, hydrogenated SBS (SEBS) 0.1kg, graphite powder 1.5kg, carbon black 0.15kg, polyethylene wax 5g, zinc stearate 5g, join in the internal mixer, The banburying temperature is 210°C, the rotor speed is 40r / min, and the banburying time is 30 minutes. Then put the evenly mixed banbury into the mold, and send it into the hot press machine, the hot pressing temperature is 240°C, the hot pressing pressure is 100MPa, and the hot pressing time is 10min. Finally, a carbon-plastic composite bipolar plate with a thickness of 1 mm was obtained by hot pressing.

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PUM

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Abstract

The invention discloses a bipolar plate for flow batteries as well as preparation and an application of the bipolar plate. The bipolar plate is a carbon-plastic composite plate prepared from, in percentage by mass, 10%-20% of polypropylene with the melt index being 20-40, 3%-10% of a toughening agent, 75%-85% of conductive filler and 0-1% of a lubricant or prepared from 10%-20% of polypropylene with the melt index being 20-40, 3%-10% of a toughening agent and 75%-85% of conductive filler. The bipolar plate solves the problem of poor conductivity of carbon-plastic composite bipolar plates, thebody resistance and contact resistance of the bipolar plate can be reduced on the premise that pile assembly is guaranteed, and thus, the ohm internal resistance of flow energy storage batteries can be reduced.

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 an all-vanadium redox flow battery and a preparation method thereof. Background technique [0002] All-vanadium redox flow energy storage battery has independent output power and capacity, flexible system design; high energy efficiency, long life, high operation stability and reliability, low self-discharge; large degree of freedom in site selection, no pollution, easy maintenance It has the advantages of simplicity, 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 generation systems such as solar energy and wind energy. There are significant demands in renewable energy power generation and smart grid construction. [0003] As a key component ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/08C08L23/06C08L101/00C08L91/06C08L53/02C08K3/04C08K5/098C08K5/09C08K7/24B29C43/58H01M8/0221H01M8/0226H01M8/18
CPCB29C43/58B29C2043/5808B29C2043/5816C08K2201/001C08K2201/011C08K2201/014C08L23/12C08L2203/20C08L2205/025C08L2205/03C08L2207/04C08L2207/062H01M8/0221H01M8/0226H01M8/188C08L23/0815C08L23/06C08K3/04C08K5/098C08L101/00C08L91/06C08K5/09C08L53/025C08K7/24Y02E60/50
Inventor 刘涛张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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