Confronting Sulfur Electrode Passivation and Li Metal Electrode Degradation in Lithium-Sulfur Batteries Using Thiocyanate Anion.

ABSTRACT: Salt anions with a high donor number (DN) enable high sulfur utilization in lithium-sulfur (Li-S) batteries by inducing three-dimensional (3D) Li₂ S growth. However, their insufficient compatibility with Li metal electrodes limits their cycling stability. Herein, a new class of salt anion, thiocyanate (SCN^- ), is presented, which features a Janus character of electron donor and acceptor. Due to a strong Li⁺ coordination by SCN^- and the direct interaction of SCN^- with polysulfide anions, the LiSCN electrolyte has a remarkably high lithium polysulfide solubility. This electrolyte induces 3D Li₂ S formation and ameliorates cathode passivation, even more than Br^- , a typical high DN anion. Moreover, SCN^- fo

SUBMITTER: Jung J 

PROVIDER: S-EPMC10214224 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature