Organic Positive Materials for Magnesium Batteries: A Review

Magnesium batteries, like lithium‐ion batteries, with higher abundance and similar efficiency, have drawn great interest for large‐scale applications such as electric vehicles, grid energy storage and many more. On the other hand, the use of organic electrode materials allows high energy‐performance, metal‐free, environmentally friendly, versatile, lightweight, and economically efficient magnesium storage devices. In particular, the structural diversity and the simple activity of organic molecules make redox properties, and hence battery efficiency, easy to monitor. While organic magnesium batteries still in their infancy, this field becomes more and more promising because significant results were reported. To summarize the achievements in studies on organic cathodes for magnesium systems, their synthesis is discussed, combined with electrode design to provide the basis for controlling the electrochemical properties. Moreover, the techniques to synthesize organic materials with high‐yield are mentioned. Finally, potential problems and prospects are explored to further improve organic cathodes. Mg cell is one of the promising candidate to replace to Li‐ion batteries thanks to its advantages such as more abundance, cheaper and most importantly, the safety for the users. Positive electrode study is an important field in its development. Not only inorganic materials, but also the organic positive electrode research remains a major challenge to its potential use. Therefore, in this review, studies on organic positive electrodes in Mg batteries so far will be generalized.