Additive-containing electrolyte for iron-chromium flow battery and application of additive-containing electrolyte
A flow battery and electrolyte technology, which is applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of iron-chromium flow battery, which has a large impact on performance, rapid battery capacity decay, and aggravated hydrogen evolution reaction, so as to reduce hydrogen evolution. Effects of side reactions, improved electrochemical activity, and simple operation
Inactive Publication Date: 2020-04-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
In the actual operation process, due to the low reactivity of chromium ions in the negative electrode electrolyte, which is much lower than that of the positive electrode, the performance of the battery is low, and the electrode potential of the chromium ion reaction is close to the hydrogen evolution potential. During the charge and discharge process, The performance of iron-chromium flow battery is greatly affected by the hydrogen evolution reaction
In addition, iron-chromium flow batteries usually use a higher operating temperature, which intensifies the hydrogen evolution reaction, resulting in faster battery capacity decay during multi-cycle operation.
Method used
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Embodiment 1
[0022] into the base electrolyte (1.0M FeCl 2 , 1.0MCrCl 3 , 3MHCl, water balance) by adding 20mMSnCl 2 , fully stirred evenly and completely dissolved to prepare the electrolyte solution to be tested. Use 70mL containing SnCl respectively 2 The electrolyte to be tested and the blank electrolyte (1.0M FeCl 2 , 1.0MCrCl 3 , 3MHCl, water balance) as negative electrode electrolyte, 70mL blank electrolyte as positive electrode electrolyte, assemble two iron-chromium flow batteries. Among them, the battery diaphragm is a 60 μm perfluorosulfonic acid membrane (purchased from Chaoyang Huading Energy Storage Technology Co., Ltd.), and the effective area of the diaphragm is 28 cm 2 , the electrode is graphite felt, the bipolar plate is graphite plate, and the current density is 120mA / cm 2 . The single cell is charged and discharged at a constant current at 65°C, and the cut-off voltage is 0.7V to 1.2V, thus obtaining the following figure 1 and figure 2 The charge-discharge ...
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Abstract
The invention discloses an additive-containing electrolyte for an iron-chromium flow battery and the application of the additive-containing electrolyte, and belongs to the technical field of flow battery energy storage. The additive-containing electrolyte is an electrolyte containing M ions and obtained by adding the additive into a basic electrolyte, the M ions are one or more of tin ions, calcium ions, cobalt ions, manganese ions, antimony ions, molybdenum ions, cadmium ions and strontium ions, and the concentration of the M ions in the electrolyte ranges from 0.001 mol / L to 0.5 mol / L. The electrolyte used in the invention can effectively improve the reaction activity of the positive and negative redox couple, improve the performance of the battery, reduce the side reactions and slow down the capacity attenuation. The electrolyte is easy to obtain, is low in cost, and meanwhile, can guarantee the long-term, efficient and stable operation of the battery.
Description
technical field [0001] The invention relates to the technical field of energy storage of a flow battery, in particular to an electrolyte containing additives for an iron-chromium flow battery and an application thereof. Background technique [0002] With the continuous consumption of fossil energy and the increasingly serious environmental pollution, renewable energy such as solar energy and wind energy are widely used. However, the instability and discontinuity of these renewable energy sources restrict their further development. In order to improve the power quality and reliability of renewable energy power generation, large-scale energy storage technology is one of the effective solutions. FeCr flow battery has become one of the most promising technologies for large-scale energy storage such as renewable energy power generation due to its advantages of independent system energy and power, fast response, safety and reliability, long cycle life, and high energy efficiency....
Claims
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IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 王绍亮刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI