Tuning anion solvation energetics enhances potassium-oxygen battery performance.

ABSTRACT: The oxygen reduction reaction (ORR) is a critical reaction in secondary batteries based on alkali metal chemistries. The nonaqueous electrolyte mediates ion and oxygen transport and determines the heterogeneous charge transfer rates by controlling the nature and degree of solvation. This study shows that the solvent reorganization energy (λ) correlates well with the oxygen diffusion coefficient [Formula: see text] and with the ORR rate constant [Formula: see text] in nonaqueous Li-, Na-, and K-O₂ cells, thereby elucidating the impact of variations in the solvation shell on the ORR. Increasing cation size (from Li⁺ to K⁺) doubled [Formula: see text], indicating an increased sensitivity of k to the choice of anion, while variations in [Formula: see tex

SUBMITTER: Sankarasubramanian S 

PROVIDER: S-EPMC6660729 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature