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Porous electrode for liquid flow battery and preparation method thereof
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A porous electrode, flow battery technology, applied in battery electrodes, circuits, electrospinning, etc., can solve problems such as sacrificing electrode transmission performance, and achieve the effect of ensuring mechanical properties, increasing active area, and improving battery performance
Active Publication Date: 2021-11-12
GUANGZHOU HKUST FOK YING TUNG RES INST
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Problems solved by technology
The traditional electrospun carbon fiber can provide a larger specific area due to its smaller fiber filament diameter, but at the same time it also sacrifices the transmission performance of the electrode, resulting in a large concentration polarization
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Embodiment 1
[0036] A porous electrode prepared by the following method:
[0037] (1) Mix 2g of polyacrylonitrile (PAN), 1g of zinc nitrate and 17g of N,N-dimethylformamide, heat and dissolve in a water bath at 70°C, and prepare an electrospinning stock solution.
[0038] (2) Take 15mL of the electrospinning stock solution from step 1, connect it to a 20G (0.60mm inner diameter) needle, and set the advancing speed of the electrospinning stock solution to 1.0mL h -1 , the electrospinning voltage was 17kV, the distance from the needle to the receiving end was 20cm, and the rotating speed of the receiving wheel was 200rpm. The ambient temperature of electrospinning was 25 °C and the relative humidity was 55%. The electrospun fiber membrane was removed after spinning for 10 h.
[0039](3) Weigh 1g of 2-methylimidazole and dissolve it in 200mL of a mixed solution of methanol and ethanol with a volume ratio of 1:1, cut the electrospun fiber membrane (4cm×4cm) in step 2 and soak it in the 2-met...
Embodiment 2
[0047] A porous electrode prepared by the following method:
[0048] (1) Weigh 2g of polyacrylonitrile, 1g of zinc acetate and 17g of N,N-dimethylformamide, mix them, heat and dissolve in a 70°C water bath, and prepare an electrospinning stock solution.
[0049] (2) Take 15mL of the electrospinning stock solution from step 1, connect it to a 20G (0.60mm inner diameter) needle, and set the advancing speed of the electrospinning stock solution to 1.0mL h -1 , the electrospinning voltage is 17kV, the distance from the needle to the receiving end is 20cm, and the rotating speed of the receiving wheel is 200rpm. The ambient temperature of electrospinning was 25 °C and the relative humidity was 55%. The electrospun fiber membrane was removed after spinning for 10 h.
[0050] (3) Weigh 1g of 2-methylimidazole and dissolve it in 200mL of a mixed solution of methanol and ethanol with a volume ratio of 1:1, cut the electrospun fiber membrane (4cm×4cm) in step 2 and soak it in the 2-me...
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Abstract
The invention provides a porous electrode for a flow battery and a preparation method thereof, relating to the field of flow batteries. The preparation method of the present invention comprises the following steps: S1, adding polyacrylonitrile and metal salt to N,N-dimethylformamide or N,N-dimethylacetamide, heating and mixing, and waiting for polyacrylonitrile and metal salt Dissolving the salt to obtain an electrospinning stock solution; S2, performing electrospinning with the electrospinning stock solution to obtain an electrospun fiber membrane; S3, dissolving the organic ligand in a solvent to obtain an organic ligand solution, and spinning the electrospun fiber The membrane is immersed in the organic ligand solution for a period of time, and MOF particles are generated in situ on the surface of the electrospun fiber; S4, pre-oxidizing the fiber with MOF particles deposited on the surface, and then carbonizing in an inert gas atmosphere to obtain porous electrode. The porous electrode prepared by the invention has a large specific surface area, helps to reduce the activation loss of the battery, improves the performance of the battery, and is applicable to various liquid flow batteries.
Description
technical field [0001] The invention relates to the field of flow batteries, in particular to a porous electrode for a flow battery and a preparation method thereof. Background technique [0002] With the increasing problems of environmental pollution, climate warming and energy shortage, the proportion of clean and renewable energy in the total global power generation is gradually increasing, mainly including wind power and solar power generation. However, due to the influence of time, weather and other factors, wind power and solar power generation have intermittent and fluctuating power generation. In order to improve the stability of grid-connected renewable energy power generation, it is necessary to use energy storage systems to coordinate between wind energy, photovoltaic power generation and the grid. At present, the main energy storage systems include pumped hydro storage, compressed air energy storage, and battery energy storage. Among them, battery energy storage...
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