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
Inactive Publication Date: 2009-10-28
TSINGHUA UNIV
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Problems solved by technology
In order to overcome the disadvantages of complex temperature control during high-temperature melting processing, thermal decomposition of polymer materials, high melt viscosity, and difficulty in fully mixing with conductive fillers, it has been proposed to use polymer suspensions and conductive fillers to mix the dried soaking material in The technical method of repeatedly rolling into sheets at 70-80°C, injecting into a mold and sintering in a high-temperature furnace (CN101150192A)
Due to the different chemical bond properties and structures of inorganic carbon materials and organic polymer compounds, the cohesive energy and surface hydrophilic and hydrophobic properties of the materials are significantly different, which seriously affects the uniform dispersion of carbon conductive fillers in polymer suspensions. Mixing at the molecular scale affects the further improvement of the conductivity of the bipolar plate
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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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Abstract
The invention relates to a preparation method of a liquid flow battery composite material bipolar plate, belonging to the technical field of liquid flow battery bipolar plate preparation. The preparation method of the liquid flow battery bipolar plate comprises three steps of using a solution method for mixing, using a tape casting method for casting and using a compression molding method for molding successively. The weight percentage of graphite powder / (graphite powder plus polyvinylidene fluoride) is 30% to 75%, and the dissolving temperature is 50 DEG C to 110 DEG C. The thin-layer thickness of a solution casted by the tape casting method is 0.2mm to 5mm, the compression molding temperature is 190 DEG C to 250 DEG C, and the pressure is 11MPa to 30MPa. The composite material bipolar plate made by using the method has the thickness of 1.0mm to 2.2mm and the electrical conductivity of 0.13S / cm to 41S / cm. The invention is easy for organizing large-scale and low-cost production process so as to overcome the shortcomings of complex processing and poor electrical conductivity of the prior liquid flow battery bipolar plate, thus laying the foundation for developing the chemical power technology used in large-scale energy conversion and storage.
Description
technical field [0001] The invention belongs to the technical field of bipolar plate preparation of liquid flow batteries. technical background [0002] The use of renewable energy such as solar energy, wind energy, and ocean wave energy to generate electricity can reduce human dependence on fossil fuels, and is one of the important ways to obtain energy from nature in the future. However, due to the unstable characteristics of solar energy, wind energy, ocean wave energy, etc., it is difficult to maintain a stable power output. It needs to cooperate with a certain scale of power storage devices to form a complete power supply system to ensure continuous and stable power supply. Therefore, the development of energy storage systems with high power conversion efficiency, large storage capacity, and good economic performance has become an important link in the development of renewable clean energy power generation. [0003] Vanadium Redox Battery (VRB) is a new type of chemica...
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IPC IPC(8): H01M8/02H01M4/88H01M4/00H01M8/0241
CPCY02E60/50
Inventor 王保国徐冬清范永生刘平
Owner TSINGHUA UNIV
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