We report on stabilization of Li–S cells cycled with an areal charge/discharge capacity of 2 mAh cm−2 at current densities of 1–2 mA cm−2 using ethereal LiTFSI/LiNO3/DOL/DME electrolyte solution containing 0.1M Li2S8. This electrolyte solution enables stable lithium metal stripping−plating both in symmetric Li∣Li and full Li–S cells with composite binder free sulfur impregnated activated carbon fibers cathodes. The addition of Li2S8 substantially extends cycling life of these cells due to the formation of smooth non-dendritic Li metal surface protected with an effective SEI enriched with Li sulfides, sulfites and sulfates species. Symmetric Li∣Li could be cycled stably for more than 1000 h at 1–2 mA cm−2 with Li2S8-containing electrolyte solutions. Full Li–S cells demonstrate more than 500 stable cycles (at least 3 times more than with Li2S8 free electrolyte solution) at a current density of 1 mA cm−2 and an areal capacity of 2 mAh cm−2. The most stable cycling results were achieved for the cells cycled with discharge cut off voltage of 1.9 V preventing the depletion of LiNO3. The use of electrolyte solutions containing liquid lithium poly-sulfides makes possible considerable decrease in the amount of the electrolyte solution and increases the energy density of the cells.
|Journal||Journal of the Electrochemical Society|
|State||Published - Nov 2020|
Bibliographical noteFunding Information:
The work described herein was supported by Nichia Corporation, Japan and by the Israeli Committee of High Education through the INREP project.
© 2020 The Electrochemical Society (“ECS”). Published on behalf of ECS by IOP Publishing Limited.