The limited high-potential cathode materials for aqueous batteries have hindered their improvement in energy density improvement. Chlorine-based batteries with Cl0 to Cl- redox reaction (ClRR) are promising for high-performance aqueous batteries due to their high redox potential and large theoretical capacity. However, the inherent gas-liquid conversion feature of ClRR and poor Cl fixation can cause Cl2 leakage, reducing battery reversibility and raising safety concerns. Herein, we utilize a Se-based organic molecule, polymerized benzoselenadiazole (poly-PhSe), as the Cl-anchoring agent and realize an atomic level-Cl fixation through chalcogen-halogen coordinating chemistry, achieving a highly reversible ClRR with extra-low Cl2 emission and a notably high-discharge voltage (3.7 V when paired with a graphite anode). The promoted Cl fixation and multivalence conversion of Se contribute to a three-electron conversion process, resulting in a significantly high-discharge capacity of up to 344 mAh g-1 with an average output voltage of 1.79 V and a high Coulombic efficiency of 99.1%. Based on the superior reversibility of the developed poly-PhSe electrode with ClRR, a remarkable rate performance and cycling performance (with a capacity retention of 84.6% after 850 cycles) are achieved. Significantly, the pouch cell delivers a record areal capacity of up to 5.3 mAh cm-2, demonstrating great potential for practical applications. This chalcogen-halogen coordination chemistry between the Se electrode and Cl provides new insight for developing reversible and efficient batteries with halogen redox reactions.
Chen et al. (Mon,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: