Key to High Performance Ion Hybrid Capacitor: Weakly Solvated Zinc Cations.

ABSTRACT: Zinc ion hybrid capacitors suffer from lack of reversibility and dendrite formation. An electrolyte, based on a solution of a zinc salt in acetonitrile and tetramethylene sulfone, allows smooth zinc deposition with high coulombic efficiency in a Zn||stainless steel cell (99.6% for 2880 cycles at 1.0 mA cm^-2 , 1.0 mAh cm^-2 ). A Zn||Zn cell operates stably for at least 7940 h at 1.0 mA cm^-2 with an area capacity of 10 mAh cm^-2 , or 648 h at 90% depth of discharge and 1 mA cm^-2 , 9.0 mAh cm^-2 . Molecular dynamics simulations reveal the reason for the excellent reversibility: The zinc cation is only weakly solvated than in pure tetramethylene sulfone with the closest atoms at 3.3 to 3.8 Å. With this electrolyte, a zinc||activate

SUBMITTER: Chen P 

PROVIDER: S-EPMC10797483 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature