demands. Up to now, VFBs and other types of flow batteries have been demonstrated, such as 5 MW/10 MWh VFB system combined with a 50 MW wind farm in Faku, Shenyang. However, there are still challenges for traditional flow batteries to further expand their industrialization. Thus, many novelaqueous and organic flow battery systems have been proposed recently, such as organic-based flow batteries. In fact, for both conventional and novel flow battery systems, the improvement in their energy density and power density, along with the decrease in their cost is the ultimate aim of the R&D. In general, this aim will be accomplished mainly by designing and optimizing the key materials of flow batteries, including electrolytes, electrodes, separators, and so forth. In recent years, many significant breakthroughs and achievements in the field of flow batteries have been reported. Herein, in order to betterunderstand and promote the R&D in the field of flow batteries,a special column titled "Flow battery"on Journal of Energy Chemistry is ensued for the interested readers.
This special column consists of three reviews, seven articles and one communication, authors of which all experts in the field of flow batteries. And these papers cover the main researches and advancements for the key materials of flow batteries. The three reviews cover the investigation and process for the key materials of aqueous and organic flow battery systems. The seven articles and one communication focus on the newest results about the keycomponents of flow batteries, largely including modifications on electrolytes and electrodes.A common theme of this special column is that the energy density of flow batteries can be enhanced by improving the solubility and thermal stability of electrolytes, while their increased power density can be derived from the reduction in the battery polarization. Besides, the improvement in the performances of the separators, bipolar plates and other battery components also contributes to the elevated power and energy density of flow batteries. With the development of the key materials in redox flow batteries, their performances are bound to improve, propelling their successful industrialization.
This special column is a comprehensive reference on the recent science and technology advancement of various redox flow battery technologies for the researchers in this field, as well as the readers who are interested in the flow battery related materials, chemistry and system development.
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