A kind of preparation method of asymmetric speek/pp/fcb composite diaphragm for battery
An asymmetric, composite membrane technology, used in fuel cells, battery pack components, circuits, etc., can solve the problems of low proton conductivity, poor vanadium resistance, and high price of proton exchange membranes, and reduce self-discharge. Phenomenon, low raw material cost, low price effect
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Embodiment 1
[0033] 1. Preparation of SPEEK solution: add 16.0 g of polyether ether ketone that has been vacuum dried at 80°C for 16 hours into 200ml of concentrated sulfuric acid with a concentration of 95-98wt%, and perform sulfonation reaction in a water bath at 30-70°C for 18 hours The product is added to the ice-water bath with a separatory funnel at a speed of 10-25ml / min and stirred vigorously. The product is filtered under reduced pressure and washed repeatedly until it is neutral; the product is dried at room temperature for 12-24 hours, and then dried in vacuum at 60°C for 10 Hours to obtain sulfonated polyether ether ketone (SPEEK). The SPEEK obtained is dissolved in DMSO at a mass volume of 1 / 5-1 / 100g / ml to prepare a SPEEK solution.
[0034] 2. Preparation of functionalized carbon material: 1.5g of carbon material, here XC-72 is used, vacuum-dried at 50°C for 5 hours, and then added to a flask containing 200ml of deionized water, ultrasonicated for 30min, and then stirred for 2h; ...
Embodiment 2
[0044] The difference from Example 1 is:
[0045] 1. Take 10 ml of the prepared SPEEK solution, and use the remaining steps in Example 1 to prepare a SPEEK composite diaphragm.
[0046] 2. The FCB diaphragm was compounded using the same steps after Example 1 to prepare an asymmetric PSFA / PP / SPEEK compound diaphragm.
[0047] In this embodiment, the thickness of the obtained SPEEK / PP / FCB composite diaphragm is 170 μm, and the composite diaphragm uses the PP diaphragm as the reinforced membrane, and the SPEEK diaphragm and the FCB layer are respectively composited. The thickness of the SPEEK is 10 to 90 μm, and the thickness of the SPEEK diaphragm is 15 to 80 microns. The interfaces in the composite diaphragm are in good contact, and there is no separation of the layers. The FCB layer has a uniform and dense texture.
[0048] The relevant performance data of this embodiment is as follows:
[0049] The surface resistance of the diaphragm in the all-vanadium redox flow battery measured a...
Embodiment 3
[0051] The difference from Example 1 is:
[0052] 1. Take 30 ml of the prepared SPEEK solution, and use the remaining steps in Example 1 to prepare a SPEEK composite diaphragm.
[0053] 2. The FCB diaphragm was compounded using the same steps after Example 1 to prepare an asymmetric SPEEK / PP / FCB compound diaphragm.
[0054] In this embodiment, the thickness of the obtained SPEEK / PP / FCB composite membrane is 300 μm, and the composite membrane uses the PP membrane as the reinforced membrane to compound the SPEEK membrane and FCB layer respectively. The thickness of SPEEK is 50-220 μm, and the thickness of SPEEK membrane is 15 to 80 microns. The interfaces in the composite diaphragm are in good contact, and there is no separation of the layers. The FCB layer has a uniform and dense texture.
[0055] The relevant performance data of this embodiment is as follows:
[0056] The surface resistance of the diaphragm in the all-vanadium redox flow battery measured at room temperature is 1.41Ω / ...
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