Preparation method of liquid flow battery composite material bipolar plate
A composite material and liquid flow battery technology, which is applied in the direction of battery electrodes, fuel cell parts, fuel cells, etc., can solve the problem of thermal decomposition of polymer materials, high melt viscosity, which affects the uniform dispersion of carbon-based conductive fillers, and is very difficult to solve. The problem of sufficient mixing of difficult-to-conduct fillers is achieved to achieve the effects of easy batch preparation, promotion of electrochemical redox reaction, and improvement of chemical stability
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[0018] The present invention contains following steps successively;
[0019] Step (1), dissolving the high molecular compound polyvinylidene fluoride in a dimethyl sulfoxide solvent, the concentration of the polyvinylidene fluoride in the solution is 3% to 11% when expressed by weight percentage, and the dissolution process is at 50 Stirring is completed within the temperature range of ℃~110℃;
[0020] Step (2), adding conductive filler to the solution obtained in step (1), stirring and mixing in the temperature range of 50°C to 110°C, the conductive filler is graphite powder, the graphite powder / (graphite powder+polyylidene fluoride The weight percent of ethylene) is between 30%~75%;
[0021] In step (3), cast the solution obtained in step (2) on a smooth glass surface into a thin layer with a thickness of 0.2 to 3 mm, and place it in an environment within the temperature range of 50°C to 110°C by using the tape casting method Drying in the middle, after the dimethyl sulfox...
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