A high-capacity cathode for rechargeable K-metal battery based on reversible superoxide-peroxide conversion.

ABSTRACT: As a promising low-cost energy storage device, the development of a rechargeable potassium-ion battery (KIB) is severely hindered by the limited capacity of cathode candidates. Regarded as an attractive capacity-boosting strategy, triggering the O-related anionic redox activity has not been achieved within a sealed KIB system. Herein, in contrast to the typical gaseous open K-O₂ battery (O₂/KO₂ redox), we originally realize the reversible superoxide/peroxide (KO₂/K₂O₂) interconversion on a KO₂-based cathode. Controlled within a sealed cell environment, the irreversible O₂ evolution and electrolyte decomposition (induced by superoxide anion (O₂ ^-) formation) are effectively restrain

SUBMITTER: Qiao Y 

PROVIDER: S-EPMC8566171 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature