Work

Synergistic Se‐Doping and Accompanying S‐Vacancies Drive Lattice Distortion and p‐Band Modulation for Enhanced Sodium Storage in Sulfides

Year: 2026

Type: article

Abstract: ABSTRACT Metal sulfides, especially those containing alloying‐capable metal elements, have shown great potential as sodium storage materials. However, the complex reaction process imposes more stringent requirements on the kinetic rate. A simple lattice distortion strategy is first proposed in this work to engineer the p‐band center of S in Cu 3 SbS 3 for enhanced Na + storage. Though the co‐doping of Se and accompanying S vacancies, the resultant lattice distortion elongated the bonds between metal and nonmetal elements to weaken their orbital hybridization and lift the p‐band center for a high Na + adsorption. The defects also increase the number of charge carriers for an improved conductivity. All those merits combined to contribute a superior electrochemical reaction kinetic in the Se‐Cu 3 SbS 3 @rGO anode. It achieved a high capacity of 569.1 mAh g −1 at 0.1 A g −1 , excellent rate capability of 273.6 mAh g −1 at 50 A g −1 and superior cycling stability of 387.4 mAh g −1 (90%) after 1000 cycles at 5 A g −1 as well as 92% after 150 cycles at 0.5 A g −1 in the full cells. The insights into the function mechanism of Se‐vacancies doping‐induced lattice distortion offer valuable insights into the design and development of sulfide‐based anode materials and sodium‐ion batteries.

Source: Advanced Science

DOI: 10.1002/advs.75070