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 energyperformance, 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.

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Magnesium (Mg) is one of the popular elements on the earth which is more abundance, cheaper and safer for the users than lithium metal. In the combination with organic compounds (carbonyl‐, nitrogen‐, and sulfur‐based materials) as positive electrodes, the electrochemical system can be considered as a member of green chemistry. Moreover, this review will play a small role in reducing the environmental impact of the energy storage sector by avoiding the use of heavy metals or toxic elements. For more information, see the Review by N. A. Tran et al. on page 9198.