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Zinc-iodine flow battery

A flow battery, iodine solution technology, applied in the direction of regenerative fuel cells, etc., can solve the problems affecting the battery cycle stability, low battery power density, electrolyte instability, etc., to avoid membrane pollution problems, reduce environmental burden, and low cost. Effect

Active Publication Date: 2019-05-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, at present, zinc-iodine flow batteries use expensive perfluorosulfonic acid ion exchange membranes. This type of membrane material is not only expensive, but also easily polluted in the neutral electrolyte solution system, which increases the internal resistance of the battery and leads to poor cycle performance. (<40 cycles)
In addition, the electrolyte solution used in zinc-iodine flow batteries is based on ZnI 2 Mainly, the ionic conductivity of this type of membrane in the electrolyte system is poor, and the electrolytes of the positive and negative electrodes are unstable under high current density and long cycle, and are prone to precipitation, which greatly affects the cycle stability of the battery; in addition, currently The reported working current density of zinc-iodine flow battery is only 10mA / cm 2 , low battery power density

Method used

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Experimental program
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Embodiment Construction

[0037] Battery performance test: The assembly of single cells is as follows: positive terminal plate, current collector, carbon felt positive electrode with liquid flow frame, separator, carbon felt negative electrode with liquid flow frame, and negative end plate. The flow rate of the electrolyte in the battery is 10mL / min, controlled by time, and the voltage is double cut-off: the charge cut-off time is 45mins, the charge cut-off voltage is 1.5V, and the discharge cut-off voltage is 0.1V.

[0038]

[0039]

[0040]

[0041] Figure 1-Figure 7 Zinc iodine flow battery with ZnBr 2 And KI as the positive and negative active materials of the battery, KCl as the supporting electrolyte, the membrane adopts a 900μm thick porous membrane, the battery can run stably at 80mA / cm2 for more than 1000 cycles, the energy efficiency is greater than 80%, and the energy density is greater than 80Wh / L. The advantages of the above system are: ZnBr 2 Middle Br - The introduction of...

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Abstract

Disclosed is a zinc-iodine flow battery. A positive electrolyte and a negative electrolyte are the same and are both a mixed aqueous solution of an iodized salt and a zinc salt; and a diaphragm is a porous diaphragm without an ion exchange group. The positive and negative electrolytes are both neutral, so that the corrosion problem of a traditional liquid flow battery strong acid and strong alkalielectrolyte is solved, the energy density of the battery is high, the current density is high, the cycle life is long, and the cost is low.

Description

technical field [0001] The invention relates to the field of flow batteries, in particular to the field of zinc-iodine flow batteries. Background technique [0002] With the continuous reduction of fossil energy and the increasing environmental pollution, the development and utilization of renewable energy is particularly important, but the general renewable energy such as wind energy and solar energy is difficult to use directly due to its discontinuity and instability, so Using energy storage technology to achieve continuous supply of renewable energy is the key to solving the problem. Flow batteries have become the most promising large-scale energy storage devices due to their advantages of separating power and energy and not being restricted by geographical environment. [0003] At present, the relatively mature flow batteries mainly include all-vanadium flow batteries, zinc-bromine flow batteries, sodium bromide polysulfide, etc., but the cost of all-vanadium flow batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 李先锋谢聪鑫张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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