A Liquid Metal‐Enabled Catalyst for Li‐CO2 Battery

Abstract Lithium‐carbon dioxide (Li‐CO 2 ) batteries have recently emerged as an innovative solution for energy storage and CO 2 capture, storage, and utilization. However, Li‐CO 2 chemistry exhibits poor reversibility and limited cycle life due to the cathode passivation caused by insulating discharge product—Li 2 CO 3 . Herein, a liquid metal (LM)‐based catalyst anchored on reduced graphene oxide (rGO@LM@Ru) is introduced to mitigate cathode passivation and thus enhance the electrochemical performance of Li‐CO 2 batteries. These findings indicate that LM plays a critical role in improving charge transfer and stabilizing the Ru catalyst on its surface. The rGO@LM@Ru cathode offers a low charge/discharge voltage gap of 1.0 V, an extended cycle life over 500 h, as well as enhanced capacity and rate performance for Li‐CO 2 batteries. This work proposes a novel cathode design for CO 2 redox, which suggests the promising application of the LM for next‐generation batteries.