Discovery of Dual-Functional Amorphous Titanium Suboxide to Promote Polysulfide Adsorption and Regulate Sulfide Growth in Li-S Batteries.

ABSTRACT: Lithium-sulfur (Li-S) batteries are promising as next-generation energy storage systems. Adsorbents for sulfide species are favorably applied to the cathode, but this substrate often results in a surface-passivating lithium sulfide(Li₂ S) film with a strong adsorption of Li₂ S. Here, an amorphous titanium suboxide (a-TiOx) is presented that strongly adsorbs lithium polysulfides (Li₂ S_x , x < 6) but relatively weakly adsorbs to Li₂ S. With these characteristics, the a-TiO_x achieves high conversion of Li₂ S_x and high sulfur utilization accompanying the growth of particulate Li₂ S. The DFT calculations present a mechanism for particulate growth driven by the promoted diffusion and favorable clus

SUBMITTER: Gueon D 

PROVIDER: S-EPMC9353452 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature