Small Methods, Год журнала: 2025, Номер unknown

Опубликована: Апрель 29, 2025

Abstract Typical shuttle effect of lithium polysulfides (LiPSs) and slow kinetics redox reactions seriously hinder the potential application lithium–sulfur batteries (LSBs). Herein, a titanium based ternary accordion heterostructure (i.e., TiC‐TiN‐TiO 2 ) is first fabricated through an acid‐assisted eutectoid reaction Ti 3 CN MXene obtained via efficiently gas‐etching AlCN MAX. The in situ crystal reconstruction not only creates functional sur/interface configuration but generates built‐in electric field (BIEF) at interfaces, which induce interfacial charge redistribution accelerate electronic/ionic conductions whole heterostructures. Besides, well‐defined functions conductive TiC, adsorptive TiO , catalytic TiN enable efficient fixation conversion LiPSs. Accordingly, LSBs assembled with modified separators demonstrate remarkable reversible capacity 1185 mAh g −1 0.5 C, outstanding retention 778 after 500 cycles decay rate 0.078% per cycle. Moreover, excellent capability (838 5 C) superior cycling stability high sulfur loading (3.7 mg cm −2 low electrolyte/sulfur ratio (6.0 µL are also achieved. More significantly, solid solution MXenes it devised here provides innovative avenue to design hierarchical heterostructures for high‐performance beyond.

Язык: Английский