Influence And Improvement Strategy Of Zinc-air Flow Battery Performance Of Carbon-based Oxygen Electrode

The growing focus on energy security and global warming has driven the inevitable conversion of non-renewable fossil fuels into clean and abundant energy sources such as solar and wind.However,these renewable energy sources are inherently intermittent and unreliable;energy peaks and peak demand periods often do not match,which poses a huge challenge for the widespread integration of renewable energy into national energy networks.Addressing these issues requires the development of large-scale energy storage systems to balance the load and reduce the peak of renewable energy production.Among various energy storage technologies,electrochemical systems are gaining momentum due to lack of geological/geographical constraints and the ability to meet different grid functions.Zinc-air flow battery is the best choice for large-scale and efficient energy storage devices due to its unique high energy density,low safety hazard and high cost performance.The design of the flowing electrolyte helps to alleviate the problem of zinc electrode and performance degradation and air electrode degradation.However,it also has problems such as unstable performance and short life.This paper is devoted to exploring the main factors affecting battery performance and giving an effective strategy to improve battery performance.The details are as follows:(1)It was found that the battery capacity efficiency and energy storage capacity increased with the increase of the electrolyte solution flow rate,but when the flow rate reached a certain level(such as 180 mL/min),the flow rate had little effect on the battery performance;in the low temperature region,the battery voltage efficiency The temperature rises and rises,but when the temperature is too high,the battery cycle life will be greatly reduced;(2)In this section,two conventional electrode structures were used,and the performance tests of the zinc-air flow battery were performed on the Single A and Double B catalysts,respectively.The test results were compared with the battery performance of the Pt/C+IrO2/C catalyst under the same conditions,and the potential for replacing the noble metal platinum-based catalyst was found.Designed a new oxygen electrode structure,combining the catalytic layer and the diffusion layer into one,simplifying the electrode fabrication process,optimizing the overall performance of the battery,and obtaining a high power density zinc-air flow battery for the zinc-air flow battery Assembly provides a new solution;(3)Based on the above two major discoveries,the ZIF-8/Fe-Ni integrated electrode with carbon reduction and oxygen precipitation dual-function carbon fiber paper was designed and prepared,which performed well in the comprehensive performance test of zinc-air flow battery.It has a low charging voltage and a high discharge voltage,and exhibits good stability for up to 250 hours.