Tailoring the Structural Evolution of Multi-Electron Redox Conversions via Strong Selenium-Carbon Interaction for Robust Aqueous Copper-Ion Batteries.

ABSTRACT: Aqueous metal-selenium batteries based on chalcogenide cathodes, despite their multi-electron conversion-type redox reactions and rapid kinetics, suffer from short lifespans and unclear capacity degradation mechanisms. The interfacial interactions between doped carbon and chalcogenides correlate closely with the electrochemical structural evolution. Hence, flower-like Cu_2-xSe wrapped with ultrathin N-doped carbon layer (Cu_2-xSe@N-C) is synthesized via a simple γ radiation-pyrolysis route for the first time. The Cu_2-xSe@N-C cathode displays a high-rate performance and long-term stability, with a respective capacity of 310.6 mAh g^-1 at 20 A g^-1 and a capacity retention rate of 92.9% after 30 000 cycles over 2000 h at 5 A g^-1.

SUBMITTER: Jiang F 

PROVIDER: S-EPMC12005742 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature