A gradient electrode for a flow battery and its application
A flow battery and electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limited improvement of voltage efficiency and energy efficiency, and achieve volume and cost reduction, good fluidity, and small longitudinal resistance. Effect
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Embodiment 1
[0028] Select 2.5mm thick, bulk density 0.08gcm -3 The graphite fiber felt is used as the diffusion layer, with a thickness of 2 mm and a bulk density of 0.16 gcm. -3 The carbon fiber felt is used as the catalytic layer, and then the two layers of felt are superimposed together, and they are needled into one body with a needle punching machine to obtain gradient electrodes with different densities in the longitudinal direction, and the needle punch density is 100 needles / cm. 2 . When the cell is assembled, the gradient electrode has the diffusion layer close to the bipolar plate and the catalytic layer close to the membrane. It is assembled into an all-vanadium flow single cell under the compression of the end plate. After compression, the electrode thickness is about 3mm and the electrode area is 48cm. 2 . The positive electrolyte is 1.5M VO 2+ 3M H 2 SO 4 Solution 60ml, negative electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 60ml. The charge-discharge curves of the ...
Embodiment 2
[0030] Select 4mm thick, bulk density 0.1gcm -3 The carbon fiber felt is used as the diffusion layer, with a thickness of 1 mm and a bulk density of 0.2 gcm. -3 The carbon fiber felt is used as the catalytic layer, and then the two layers of felt are superimposed together, and they are needled into one body with a needle punching machine to obtain gradient electrodes with different densities in the longitudinal direction, and the needle punch density is 200 needles / cm. 2 . When the cell is assembled, the gradient electrode has the diffusion layer close to the bipolar plate and the catalytic layer close to the membrane. It is assembled into an all-vanadium flow single cell under the compression of the end plate. After compression, the electrode thickness is about 4mm and the electrode area is 48cm. 2 . The positive electrolyte is 1.5M VO 2+ 3M H 2 SO 4 Solution 60ml, negative electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 60ml. The single cell using the gradient electr...
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