Polymer composite material bipolar plate and preparation method thereof, and vanadium redox flow battery

A technology of composite materials and polymers, applied in bipolar plates of polymer composite materials, its preparation method and the field of vanadium flow batteries, can solve the problems of blocking electrolyte flow channels of flow batteries, carbon particles are easy to fall off, excellent, etc., Achieve the effects of improving battery applicability, avoiding secondary heating, and decreasing resistivity

Inactive Publication Date: 2019-11-19
BEIJING PRUDENT CENTURY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The disadvantage of the above two cases of granulation first and then extrusion is that the composite material needs to be processed twice, and each time it needs to be heated to melt the material; the second heating and processing will greatly increase the degree of degradation of the polymer resin, affecting the bipolar The service life and mechanical strength of the plate also have a great influence on the battery performance of the bipolar plate
Although this technology reduces the surface resistance of the bipolar plate to some extent, the carbon particles on the surface are easy to fall off, which will block the flow channel of the electrolyte of the flow battery and pollute the electrolyte, so it is not suitable for the application of vanadium batteries.
[0010] To sum up, in the case that graphite plates cannot meet the needs of vanadium battery bipolar plates, a lot of research work has been done on the development and research of composite bipolar plates, but none of them have excellent performance indicators and can be used in vanadium batteries for a long time. Bipolar plate products suitable for large-scale production

Method used

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  • Polymer composite material bipolar plate and preparation method thereof, and vanadium redox flow battery
  • Polymer composite material bipolar plate and preparation method thereof, and vanadium redox flow battery
  • Polymer composite material bipolar plate and preparation method thereof, and vanadium redox flow battery

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preparation example Construction

[0031] In the preparation raw materials of the polymer composite bipolar plate, the polymer resin is the basic component of the bipolar plate, which can affect the resistivity and toughness of the bipolar plate. In the present application, the content of the polymer resin is 30wt% to 59wt%, in some specific embodiments, the content of the polymer resin is 32wt% to 50wt%, in some specific embodiments, the The content of the polymer resin is 36wt%-45wt%, more specifically, the content of the polymer resin is 36.5wt%, 38wt%, 38.5wt%, 39.5wt%, 42wt% or 44.5wt%. In the present application, if the content of the polymer resin is too large, the resistivity of the bipolar plate is too large, and then the performance of the battery is reduced; if the content of the polymer resin is too small, it will bring great difficulties to the processing of the bipolar plate. It is a big problem, and the toughness of the bipolar plate drops sharply. The polymer resin described in the application ...

Embodiment 1

[0047] According to the mass ratio of polypropylene: dibutyl phthalate = 92:8, weigh and put it into a mixer for mixing, the stirring speed is 1600 rpm, and the stirring time is 1h to obtain a polymer resin mixture;

[0048] According to the mass ratio of carbon black:graphite powder:organosilicon coupling agent=45:52.5:2.5, weigh and put it into the mixer for mixing, the stirring speed is 1750 rpm, and the stirring time is 1.5h to obtain conductive carbon filler mixture;

[0049] According to the mass ratio of polymer resin mixture: conductive carbon filler mixture = 43:57, weigh and put it into a mixer, stir at a speed of 1000 rpm, 1h, to obtain a mixture;

[0050] After drying the above mixture at 100°C for 3 hours, put the obtained mixture into a twin-screw extruder, set the temperature of the extruder at 180°C, and calender the extruded sheet, and the temperature of the calender rolls is 95°C to obtain bipolar plate. The thickness of the bipolar plate is 0.6mm, the leng...

Embodiment 2

[0052] According to the mass ratio of polyvinyl chloride: POE = 90: 10, weigh and put it into a mixer for mixing, the stirring speed is 1500 rpm, and the stirring time is 1h to obtain a polymer resin mixture;

[0053] According to the mass ratio of carbon black:graphite powder:organosilicon coupling agent=60:37.5:2.5, weigh and put it into the mixer for mixing, the stirring speed is 1700 rpm, and the stirring time is 1.5h to obtain conductive carbon filler mixture;

[0054] According to the mass ratio of polymer resin mixture: conductive carbon filler mixture = 44:56, weigh and put it into the mixer, stir at 1000 rpm, 1h, to obtain the mixture;

[0055] After drying the above mixture at 100°C for 3 hours, put the obtained mixture into a twin-screw extruder, set the temperature of the extruder at 175°C, and calender the extruded sheet, and the temperature of the calender rolls is 95°C to obtain bipolar plate. The thickness of the bipolar plate is 0.6mm, the length is 600mm, a...

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Abstract

The invention provides a polymer composite material bipolar plate. The polymer composite material bipolar plate is prepared from the following raw materials: 30-59wt% of polymer resin, 40-69wt% of a conductive carbon filler, 0.2-7wt% of a plasticizer and 0.15-3wt% of a coupling agent. The invention also provides a preparation method of the polymer composite material bipolar plate. The method comprises the steps of: proportionally mixing the polymer resin with the plasticizer, and the conductive carbon filler and the coupling agent respectively, mixing the mixtures, and adding the obtained mixture into a twin-screw extruder to process a bipolar plate. According to the bipolar plate provided by the invention, the mechanical strength and toughness are improved, the service life is prolonged,the production efficiency is greatly improved, and the bipolar plate is very suitable for uninterrupted large-scale production of the bipolar plate.

Description

technical field [0001] The invention relates to the technical field of liquid flow energy storage batteries, in particular to a polymer composite bipolar plate, a preparation method thereof and a vanadium flow battery. Background technique [0002] Vanadium redox flow battery (VRB) is a new type of green large-scale energy storage battery, which has the advantages of independent capacity, high power, long life and easy operation. The bipolar plate is one of the key components of the flow battery, which plays the role of connecting the positive and negative electrodes of different single cells and conducting current. [0003] The electrolyte in VRB is a sulfuric acid solution of vanadium ions, which is highly corrosive; at the same time, V 5+ It has strong oxidizing properties, so in addition to good electrical conductivity, the bipolar plate must also have strong chemical and electrochemical corrosion resistance. The pure graphite bipolar plate currently used is expensive,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0258H01M8/0223H01M8/0226H01M8/18
CPCH01M8/0223H01M8/0226H01M8/0258H01M8/188Y02E60/50
Inventor 李铎黄绵延
Owner BEIJING PRUDENT CENTURY TECH CO LTD
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