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The method system for reducing self-discharge rate and improving zinc deposition

Return Listsource:Gratene date: 2022-06-17

The method system for reducing self-discharge rate and improving zinc depositionLike the zinc oxygen battery, the sedimentation of zinc in the zinc bromoelectric cell can only be used in the process of all stripping from the positive electrode during most cycles or all cycles, which requires the zinc content in the battery. It is controlled while it means that there are some unit batteries inside the end of the discharge, which must be reversed to ensure that zinc on the remaining unit cells can be thoroughly peeled. In these cases, bromine is produced on the negative electrode, and the matrix electrode must be etched. The method of solving this problem is usually used in the use of bipolar glass carbon electrodes.

The main problem in the presence of zinc bromide batteries is that the self-discharge rate caused by the chemical reaction of bromine and zinc negatives is high. One solution is to isolate the positive and negative electrolyte separated by non-bromine cationic selection membranes (such as nation). Another way is to react the bromine to form an insoluble solid or liquid substance.

For example, a high-brevular acid salt with asymmetric tetraalkylmine is reacted with an Australia to form an oil-shaped multobromide, which can significantly reduce the free bromine level in the solution. In some battery structures, these insoluble bromine complexes remain within the porous electrode structure; in many more advanced high-capacity battery, a separate multi-bromide is stored, simply use a simple microporous membrane. It is enough to prevent excessive self-discharge.

Now the actual battery is all cycled electrolytes to increase zinc deposition quality and allow the use of heat exchanger. It is worth noting that in the battery structure, the positive and negative electrolyte circulation system must be used. Austria Powercell is currently developing a zinc bromide battery for electric vehicles. The energy density is expected to be 70-9 asWh / kg, and the cycle life is greater than 500 times.

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