A safe and non-flammable sodium metal battery based on an ionic liquid electrolyte.

ABSTRACT: Rechargeable sodium metal batteries with high energy density could be important to a wide range of energy applications in modern society. The pursuit of higher energy density should ideally come with high safety, a goal difficult for electrolytes based on organic solvents. Here we report a chloroaluminate ionic liquid electrolyte comprised of aluminium chloride/1-methyl-3-ethylimidazolium chloride/sodium chloride ionic liquid spiked with two important additives, ethylaluminum dichloride and 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide. This leads to the first chloroaluminate based ionic liquid electrolyte for rechargeable sodium metal battery. The obtained batteries reached voltages up to ~?4?V, high Coulombic efficiency up to 99.9%, and high energy and power density of ~?420?Wh?kg^-1 and ~?1766 W kg^-1, respectively. The batteries retained over 90% of the original capacity after 700 cycles, suggesting an effective approach to sodium metal batteries with high energy/high power density, long cycle life and high safety.

SUBMITTER: Sun H 

PROVIDER: S-EPMC6656735 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature