Recycling of precipitation from vanadium redox flow battery through ion exchange

The development of renewable energy is the trend of future. And finding an energy storage technology which is matching with it is very important. Among different types of batteries, Vanadium Redox Battery is the most suitable battery. However, during the charging and discharging processes of the vanadium battery, the precipitation of vanadium pentoxide may be caused by overcharge or temperature increase, which affects the battery performance. In this experiment, the material source mainly comes from the precipitation in the positive electrode. Firstly, the precipitation, vanadium pentoxide, was dissolved in the sulfuric acid solution. Next, the impurities were eliminated by adding ion-exchange resin. In this procedure, the parameter of pH value, the ratio between ion exchange resin and vanadium pentoxide and reaction time were be supplied. Moreover, the adsorption isotherms described by means of the Langmuir and Freundlich isotherms were used to investigate the ion-exchange behaviors of vanadium. After removing the impurities, precipitant was added to get vanadate. In the nutshell, this study will show the optimal conditions of ion-exchange to obtain high purity about 95% of vanadate.