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

A flow battery and bipolar plate technology, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of poor toughness of composite plates, damage to battery life, and unsuitable stack assembly, etc., to achieve easy production process, high durability Corrosive, Inexpensive Effects

Active Publication Date: 2020-11-10
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, if the content of conductive filler is too high, the toughness of the composite board will be deteriorated, which is not suitable for stack assembly
At present, the matrix of carbon-plastic composite bipolar plates used in flow batteries is mostly polypropylene, which is relatively stable in the electrolyte of the sulfuric acid system. In the battery, due to its poor corrosion resistance, the composite plate will be partially ablated during the operation of the battery, and the mechanical properties will be greatly reduced, which will damage the battery life.

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

[0025] Weigh 0.5kg of high-density polyethylene (melt index is 1), 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, and the internal mixing temperature is 220°C , the rotor speed is 50r / min, and the banburying time is 20 minutes. Then, the evenly mixed banbury material is pulverized by a pulverizer and sent into 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 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 Example 1, the bipolar plate of t...

Embodiment 2

[0029] Weigh respectively 0.6kg of high-density polyethylene (melt index is 0.5), graphite powder 1.0kg, carbon black 0.4kg, paraffin wax 15g, stearic acid 5g, join in the banbury mixer, banbury temperature is 230 ℃, rotor speed 50r / min, banburying time 20 minutes. Then, the evenly mixed banbury material is pulverized by a pulverizer and then sent to a single-screw extruder. The barrel temperature of the extruder is 220°C, the speed of the main engine is 8rpm, and the die temperature is 200°C. The sheet is extruded and calendered. A carbon-plastic composite bipolar plate with a thickness of 1mm was formed.

Embodiment 3

[0031] Weigh respectively high-density polyethylene (melt index is 5) 0.7kg, graphite powder 0.9kg, carbon nanotube 0.4kg, polyethylene wax 10g, calcium stearate 10g, join in the banbury mixer, banbury temperature is 220 ℃, the rotor speed is 50r / min, and the banburying time is 20 minutes. Then, the evenly mixed banbury material is pulverized by a pulverizer and then sent to a single-screw extruder. The temperature of the barrel of the extruder is 210°C, the speed of the main engine is 8rpm, and the temperature of the die is 190°C. Extrude the sheet and calender A carbon-plastic composite bipolar plate with a thickness of 1mm was formed.

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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, 25%-35% of high-density polyethylene with the melt index being 2-10, 65%-75% of conducive filler and 0-2% of a lubricant or prepared from 25%-35% of high-density polyethylene with the melt index being 2-10 and 65%-75% of conductive filler. The bipolar plate solves the problems of poor halogen corrosion resistance and poor toughness of carbon-plastic composite bipolar plates taking polypropylene as a matrix as well as low conductivity of carbon-plastic composite bipolar plates, thus, the bipolar plate has high conductivity and good corrosion resistance and can reduce ohm internalresistance of flow energy storage batteries and prolong the service life of piles.

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 and application thereof. Background technique [0002] Due to its independent output power and capacity, the liquid flow energy storage 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8647H01M4/8875Y02E60/50
Inventor 刘涛张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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