s‐Tetrazines as a New Electrode‐Active Material for Secondary Batteries

Abstract Because of the limitations of conventional metal‐oxide‐based electrodes, studies on organic redox‐active materials as alternative electrodes for secondary batteries are emerging. However, reported organic electrode materials are still limited to a few kinds of organic redox groups. Therefore, the development of new redox‐active groups for high‐performance electrode materials is indispensable. Here, we evaluate s ‐tetrazine derivatives as a new electrode material in Li‐ion batteries and study their charge/discharge mechanisms by ex situ XPS measurements. The porous carbon CMK‐3 was introduced to encapsulate the s ‐tetrazines, which allowed 100 % utilization of the theoretical capacity and stable cycle performance of the s ‐tetrazines by preventing dissolution of the molecules into the electrolytes. This new class of redox‐active group can pave the way for the next‐generation of energy storage systems.