Use of poriferous separation membrane in liquid flow energy-storage cell
A liquid flow energy storage battery and separation membrane technology, which is applied to fuel cell parts, fuel cells, battery pack parts, etc., can solve the problems of public reporting of research results, achieve widening types, realize mass production, and prepare The effect of simple method
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Embodiment 1
[0032] Dissolve 7.5 grams of polyacrylonitrile in 50ml of DMSO, stir for 5 hours, spread the polymer solution on a glass plate, then quickly immerse in 5L of water, and solidify for 5 minutes to form a porous separation membrane. figure 2 A cross-sectional SEM picture of the prepared membrane material is given, showing a regular pore structure. The all-vanadium flow energy storage battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of the membrane is 9cm -2 , with a current density of 80mA cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO 4 The concentration is 3mol L -1 . The assembled flow battery has a current efficiency of 66.1%, a voltage efficiency of 81.1%, and an energy efficiency of 53.6%.
Embodiment 2
[0034] Dissolve 7.5g of polyacrylonitrile in 30mlDMSO+20mlTHF, stir for 5 hours, and spread the resulting polymer solution on a glass plate, volatilize for 10s, then quickly immerse in 5L of water, and solidify for 10 minutes to form a porous separation membrane.
[0035] The all-vanadium flow energy storage battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of the membrane is 9cm -2 , with a current density of 80mA cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO 4 The concentration is 3mol L -1 . The assembled flow battery has a current efficiency of 80.7%, a voltage efficiency of 82.1%, and an energy efficiency of 66.2%.
Embodiment 3
[0037] Dissolve 7.5g of polyacrylonitrile in 30mlDMSO+10mlTHF, stir for 5 hours, spread the resulting polymer solution on a glass plate, volatilize for 20s, then quickly immerse in 5L of water, solidify for 10 minutes, and form a porous separation membrane.
[0038]The all-vanadium flow energy storage battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of the membrane is 9cm -2 , with a current density of 80mA cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO 4 The concentration is 3mol L -1 . The assembled flow battery has a current efficiency of 91.8%, a voltage efficiency of 81.5%, and an energy efficiency of 75%.
[0039] From the battery performance comparison of Examples 1 to 3, it can be seen that as the membrane pore size decreases, the coulombic efficiency of the battery increases, the voltage effi...
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