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Method for manufacturing high-conductivity conductive plastic bipolar plate for vanadium cell

A technology of conductive plastics and high conductivity, which is applied in the direction of battery electrodes, circuits, electrical components, etc. It can solve the problems of difficulty in ensuring the uniformity of material mixing and the difficulty of manual operation in large batches, etc. It is easy to achieve large-area continuous processing , strong continuous processing and simple process

Inactive Publication Date: 2012-09-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to propose a method for preparing a high-conductivity conductive plastic bipolar plate for a vanadium battery, which solves the difficulty in ensuring the uniformity of material mixing in the prior art, and the manual operation of large batches of continuous sexual difficulties

Method used

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  • Method for manufacturing high-conductivity conductive plastic bipolar plate for vanadium cell
  • Method for manufacturing high-conductivity conductive plastic bipolar plate for vanadium cell
  • Method for manufacturing high-conductivity conductive plastic bipolar plate for vanadium cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The high conductivity bipolar plates for vanadium batteries use conductive plastic materials. The quality of the materials is as follows:

[0040]

[0041] Firstly, spray the titanate coupling agent diluted with liquid paraffin into the conductive carbon black under high-speed mixing (the mixer speed is 500 rpm), and stir for 5 minutes; the total mass of the above raw materials is 100g, In the mixer, the stirring speed is 800 rpm for 20 minutes. Then it is pelletized by twin screw, the pellets are added to a single screw, extruded at 190℃~210℃, the screw speed is 220r.min -1 , The twin-screw extruder adopts a two-stage side feeding method.

[0042] The volume resistivity of the prepared conductive bipolar (current collecting) plate is 0.5Ω·cm. As the positive and negative current collectors of the vanadium battery, the battery charge and discharge performance parameters are: Coulomb efficiency 90%, energy efficiency 72%, and voltage efficiency 80%.

Embodiment 2

[0044] The high conductivity bipolar plates for vanadium batteries use conductive plastic materials. The quality of the materials is as follows:

[0045]

[0046] First, spray the silane coupling agent diluted with liquid paraffin into the conductive carbon black under high-speed mixing (the mixer rotation speed is 500 rpm), and stir for 5 minutes; the total mass of the above-mentioned raw materials is 100g and placed in the high-speed mixer Medium, the stirring speed is 800 rpm, stirring for 20 minutes. Then it is pelletized by twin screw, the pellets are added to a single screw, and extruded at 190℃~210℃, the screw speed is 230r.min -1 , The twin-screw extruder adopts a two-stage side feeding method.

[0047] The volume resistivity of the prepared conductive bipolar (current collecting) plate is 0.5Ω·cm. As the positive and negative current collectors of vanadium batteries, the battery charging and discharging performance parameters are: Coulomb efficiency 91%, energy efficiency...

Embodiment 3

[0049] The high conductivity bipolar plates for vanadium batteries use conductive plastic materials. The quality of the materials is as follows:

[0050]

[0051]

[0052] First, spray the titanate coupling agent diluted with liquid paraffin into the conductive carbon black under high-speed mixing (the mixer speed is 500 rpm), and stir for 5 minutes; the total mass of the above raw materials is 100g, In the mixer, the stirring speed is 800 rpm for 20 minutes. Then it is pelletized by twin screw, the pellets are added to a single screw, and extruded at 190℃~210℃, the screw speed is 240r.min -1 , The twin-screw extruder adopts two-stage side feeding method.

[0053] The volume resistivity of the prepared conductive bipolar (current collecting) plate is 0.5Ω·cm. As a vanadium battery positive and negative current collector, the battery charge and discharge performance parameters are: Coulomb efficiency 91%, energy efficiency 73%, voltage efficiency 80%.

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Abstract

The invention relates to the field of manufacturing vanadium cells, in particular to a method for manufacturing a high-conductivity conductive plastic bipolar plate for the vanadium cell. The method comprises the steps of: uniformly mixing a conductive plastic raw material in a high-speed mixing machine, mixing through a double-screw extruder to manufacture master batches, adding the manufactured master batches to a single-screw extruder, and carrying out extrusion molding through the single-screw extruder to manufacture a conductive high-molecular-material collector plate. According to a bipolar plate meeting technique requirements, temperature-resistant resin and a conductive filler are selected, pelletized by the double-screw extruder, and extruded by the single-screw extruder to manufacture a high-strength, anti-corrosion and high-temperature-resistant plastic bipolar plate; and the resistivity of the manufactured high-strength, anti-corrosion and high-temperature-resistant plastic bipolar plate can reach 0.1-0.5 omega per centimeter so as to meet an application index of the vanadium cell. The bipolar plate manufactured by the method disclosed by the invention can be rather thin, has the advantages of large area, good continuity and low cost, and also has the advantages of being capable of reducing the cost of the vanadium cell, ensuring stable operation in cells without releasing chemical groups, and maintaining stability and reliability of an electric pile of the vanadium cell.

Description

Technical field [0001] The invention relates to the field of vanadium battery manufacturing, in particular to a method for preparing a high-conductivity conductive plastic bipolar plate for vanadium batteries. Background technique [0002] Vanadium battery, called all-vanadium ion redox flow battery, is a new type of green and environmentally friendly battery. Its energy is stored in the form of positive and negative electrolytes. The positive and negative reactions are as follows: [0003] Positive reaction: VO 2 + +2H + +e - →VO 2+ +H 2 O E 0 =1.00V [0004] Negative reaction: V 3+ +e - →V 2+ E 0 = -0.26V [0005] The positive and negative electrolytes are each driven by a pump, and reduction and oxidation reactions occur respectively on the electrodes on both sides of the ion exchange membrane to complete charge and discharge. The charging and discharging current of the battery is conducted by the bipolar plate and finally collected. Therefore, as one of the key ma...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 刘建国侯绍宇严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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