Method for Improving the Stability of High Concentration Negative Electrolyte in Operation of All-vanadium Redox Flow Battery
An all-vanadium redox flow battery and negative electrode electrolyte technology, which is applied in the direction of regenerative fuel cells, can solve the problems of affecting battery stability, easy to block batteries and pipelines, and battery capacity reduction, and achieve controllable reaction speed and low price , the effect of improving stability
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Embodiment 1
[0021] An all-vanadium redox flow battery experiment was carried out with an electrolyte composed of positive and negative electrodes with a vanadium ion concentration of 2 mol / L and a sulfuric acid concentration of 2 mol / L. The positive and negative electrolyte volumes were 200 mL respectively. + Concentration is 6mol / L, adds the ammoniacal liquor of appropriate mass concentration 28% wherein, the H + The concentration drops to 4.8mol / L, and the battery continues to run. When the battery runs to 400 cycles, the negative electrode H is detected. + The concentration is 5.4mol / L. The experimental results show that the battery can still operate normally after 400 cycles, and the performance has no obvious attenuation. The battery performance is shown in Table 1
[0022] Table 1 Battery performance before and after adding stabilizer ammonia water
[0023] Coulombic efficiency voltage efficiency energy efficiency initial 97% 86% 83% After 150 cycles 9...
Embodiment 2
[0025] The all-vanadium redox flow battery experiment was carried out with the positive and negative electrodes having a vanadium ion concentration of 2 mol / L and a sulfuric acid concentration of 2 mol / L. The positive and negative electrolyte volumes were 200 mL respectively. + Concentration is 5.7mol / L, add appropriate amount of aluminum hydroxide to it, H + When the concentration drops to 4.2mol / L, the battery continues to run. When the battery runs to 450 cycles, the negative electrode H is detected. + The concentration is 5mol / L. The experimental results show that the battery can still operate normally after 450 cycles, and the performance has no obvious attenuation. Battery performance is shown in Table 2
[0026] Table 2 Battery performance before and after adding stabilizer aluminum hydroxide
[0027] Coulombic efficiency voltage efficiency energy efficiency initial 97% 87% 84% After 100 cycles 97% 86% 83% After adding aluminum hydr...
Embodiment 3
[0029] The all-vanadium redox flow battery experiment was carried out with the positive and negative electrodes having a vanadium ion concentration of 3 mol / L and a sulfuric acid concentration of 1.8 mol / L. The positive and negative electrolyte volumes were 200 mL respectively. h + Concentration is 5.5mol / L, and appropriate amount of rubidium hydroxide is added thereinto, and H + The concentration drops to 4mol / L, and the battery continues to run. When the battery runs to 200 cycles, the negative electrode H is detected. + The concentration is 4.8mol / L. The experimental results show that the battery can still operate normally after 200 cycles, and the performance has no obvious attenuation. The battery performance is shown in Table 3
[0030] Table 3 Battery performance before and after adding stabilizer rubidium hydroxide
[0031] Coulombic efficiency voltage efficiency energy efficiency initial 98% 86% 84% After 70 cycles 98% 85% 83% Af...
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