A zinc-bromine flow battery
A flow battery and battery technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of no zinc deposition space, diaphragm clogging, increased risk of zinc dendrites piercing the diaphragm, and reduce the risk of diaphragm failure , the effect of large space
Active Publication Date: 2022-04-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0010] 1) generating a large amount of zinc between the negative electrode 107 and the diaphragm 111 will block the diaphragm;
[0011] 2) generating a large amount of zinc between the negative electrode 107 and the separator 111 will hinder the diffusion of the negative electrode electrolyte in the effective electrode area;
[0012] 3) generating a large amount of zinc between the negative electrode 107 and the separator 111 will increase the risk of zinc dendrites piercing the separator;
[0013] 4) Between the negative electrode 107 and the separator 111, there is not enough space for zinc deposition
Method used
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Embodiment
[0056] Figure 7 It is a zinc-bromine flow battery using an isolation frame. The specific assembly method is: the positive and negative electrodes use 36cm 2 Carbon felt is used as the positive and negative electrodes, the thickness of the positive electrode is 6mm, and the thickness of the negative electrode is 3mm; the diaphragm uses Daramic film; the positive and negative electrodes use 100mL electrolyte respectively, and the composition of the electrolyte is 0.8MMEP, 2M ZnBr 2 , 3M KCl. 40mA / cm 2 Constant current charging and discharging, the charging time is 2h. The results show that the coulombic efficiency remains stable, the average coulombic efficiency is 96.8%, the charging can be carried out for 2 hours, and the charging capacity remains at 2880mAh. It can be cycled 40 times stably.
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Abstract
The invention relates to a zinc-bromine liquid flow battery. An isolation frame is added between the negative electrode of the battery and the diaphragm, and the isolation frame includes a first surface and a second surface opposite to it; the first surface is formed by holes formed between ribs and ribs , the second surface is composed of protrusions located at intersections between the ribs of the first surface; the holes of the first surface penetrate the second surface. The isolation frame has the advantages of simple structure, low cost, strong operability, etc., and can effectively improve the areal capacity of the battery and the cycle stability under the condition of high areal capacity.
Description
technical field [0001] The present invention relates to flow batteries. In particular, though not exclusively, the invention relates to the structural design of flow batteries. Background technique [0002] With the rapid development of society, people's demand for energy continues to grow, and the massive consumption of fossil energy has brought about energy shortages and serious ecological and environmental problems. Accelerating the promotion of the energy revolution and popularizing the application of renewable energy (such as wind energy, solar energy, etc.) is of great significance for promoting the sustainable development of mankind. However, renewable energy has obvious intermittent, unstable and uncontrollable characteristics, and it is very difficult and inconvenient to directly integrate into the grid or directly supply to the user. Using electrochemical energy storage devices to provide relay storage services for electrical energy is a very good choice. Due to...
Claims
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IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 李先锋尹彦斌张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI