Localized Polysulfide Injector for the Activation of Bulk Lithium Sulfide.

The activation of commercial LiS remains to be one of the key challenges against its commercialization as a starting cathode material for a sulfur-based Li-ion battery system. In this work we take advantage of the lower oxidation potential of commercial NaS (1-3 wt%) to serve as an and local polysulfide injector for the activation of commercial LiS (70 wt%). In contrast to applying pre-solvated redox mediators, this technique allows for the activation of commercial LiS at lower voltages with an electrolyte content as low as 3 μL mg at 3 mgmg cm and 4 μL mg at 6.5 mg cm without any other material modification.