Trimming the Degrees of Freedom via a K⁺ Flux Rectifier for Safe and Long-Life Potassium-Ion Batteries.

ABSTRACT: High degrees of freedom (DOF) for K⁺ movement in the electrolytes is desirable, because the resulting high ionic conductivity helps improve potassium-ion batteries, yet requiring support from highly free and flammable organic solvent molecules, seriously affecting battery safety. Here, we develop a K⁺ flux rectifier to trim K ion's DOF to 1 and improve electrochemical properties. Although the ionic conductivity is compromised in the K⁺ flux rectifier, the overall electrochemical performance of PIBs was improved. An oxidation stability improvement from 4.0 to 5.9 V was realized, and the formation of dendrites and the dissolution of organic cathodes were inhibited. Consequently, the K||K cells continuously cycled over 3,700 h; K||Cu cells operated stably over

SUBMITTER: Yi X 

PROVIDER: S-EPMC10439096 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature