Application of cation membrane with rigid chain segment in alkaline zinc-based flow battery
A technology of rigid chain segments and flow batteries, which is applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of high price, poor alkali resistance stability, and affecting the performance of flow batteries, and achieve the effect of improving ion selectivity
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Embodiment 1
[0068] Polyether ether ketone is directly sulfonated with concentrated sulfuric acid, and sulfonated polyether ether ketone resins with different sulfonation degrees (abbreviated as SK1, SK2, SK3) are prepared by controlling the sulfonation reaction time. The structural formula is as follows figure 2 , Sulfonation degrees are 0.70, 0.81, 0.91). Using DMAC as a solvent, the above resin was prepared into a film, and the hydroxide ion penetration test was performed on it. image 3 It can be seen that as the degree of sulfonation increases, the swelling effect of the membrane increases, and the penetration rate of hydroxide ions increases. The prepared sulfonated polyether ether ketone with different sulfonation degrees was used to assemble the alkaline zinc iron flow battery and tested. The test conditions are the same as the alkaline zinc iron flow battery assembled with perfluorosulfonic acid ion exchange membranes of different thicknesses. The battery test conditions are the sa...
Embodiment 2
[0074] Polyether ether ketone is directly sulfonated with concentrated sulfuric acid, and sulfonated polyether ether ketone resins with different sulfonation degrees (abbreviated as SK4) are prepared by controlling the sulfonation reaction time. figure 2 , The degree of sulfonation is 0.34), using NMP as the solvent, the above resin is dissolved in NMP to obtain a casting solution with a solid content of 20wt.%, and the electrochemical performance of the film in an alkaline zinc iron flow battery is The performance is characterized at 80mA cm -2 Under the working current density conditions, the coulombic efficiency of the battery is close to 100%, but due to the low degree of sulfonation of the membrane, the voltage efficiency of the battery is only 61%.
Embodiment 3
[0076] Synthesis of carboxylated polyether ether ketone ( Picture 9 , The degree of carboxylation is 0.85), using DMAC as the solvent, the above resin is dissolved in DMAC to obtain a casting solution with a solid content of 20wt.%. After the film is formed, its electrochemical performance in an alkaline zinc iron flow battery The performance is characterized at 80mA cm -2 Under the conditions of working current density, the coulombic efficiency of the battery is close to 100%, and the voltage efficiency is 87%. It has been continuously and stably operated for more than 300 cycles without significant degradation of performance, showing excellent battery performance.
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