Breaking the trade-off between capacity and stability in vanadium-based zinc-ion batteries.

ABSTRACT: Water in electrolytes is a double-edged sword in zinc-ion batteries (ZIBs). While it allows for proton insertion in the cathode, resulting in a significant increase in capacity compared to that of organic ZIBs, it also causes damage to electrodes, leading to performance degradation. To overcome the capacity-stability trade-off, organic solvents containing a small amount of water are proposed to mitigate the harmful effects of water while ensuring sufficient proton insertion. Remarkably, in a Zn(OTf)₂ electrolyte using 8% H₂O in acetonitrile as the solvent, Zn‖(NH₄)_0.5V₂O₅·0.5H₂O exhibited a capacity as high as 490 mA h g^-1 at a low current (0.3 A g^-1), with a capacity retention of 80% even af

SUBMITTER: Jiang W 

PROVIDER: S-EPMC10866371 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature