Nitrogen-Doped TiO_{2- x}(B)/MXene Heterostructures for Expediting Sulfur Redox Kinetics and Suppressing Lithium Dendrites.

ABSTRACT: Practical application of lithium-sulfur (Li-S) batteries is severely impeded by the random shuttling of soluble lithium polysulfides (LiPSs), sluggish sulfur redox kinetics, and uncontrollable growth of lithium dendrites, particularly under high sulfur loading and lean electrolyte conditions. Here, nitrogen-doped bronze-phase TiO₂(B) nanosheets with oxygen vacancies (OVs) grown in situ on MXenes layers (N-TiO_{2- x}(B)-MXenes) as multifunctional interlayers are designed. The N-TiO_{2- x}(B)-MXenes show reduced bandgap of 1.10 eV and high LiPSs adsorption-conversion-nucleation-decomposition efficiency, leading to remarkably enhanced sulfur redox kinetics. Moreover, they also have lithiophilic nature that can effectively suppress dendrites gro

SUBMITTER: Zhen M 

PROVIDER: S-EPMC11423229 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature