Porous Heteroatom-Doped Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene Microspheres Enable Strong Adsorption of Sodium Polysulfides for Long-Life Room-Temperature Sodium-Sulfur Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 34595920.
- Also identified by DOI 10.1021/acsnano.1c05193.
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Abstract
The practical application of Na-S batteries is largely hindered by their low mass loading, inferior rate capability, and poor cycling performance. Herein, we report a design strategy for encapsulation of sodium polysulfides using Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene. Porous nitrogen-doped Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene microspheres have been synthesized by a facile synthesis method. Porous nitrogen-doped Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene microspheres contain abundant pore structures and heteroatom functional groups for structural and chemical synergistic encapsulation of sodium polysulfides. Sodium-sulfur batteries, based on the as-proposed cathode, demonstrated outstanding electrochemical performances, including a high reversible capacity (980 mAh g<sup>-1</sup> at 0.5 C rate) and extended cycling stability (450.1 mAh g<sup>-1</sup> at 2 C after 1000 cycles at a high areal sulfur loading of 5.5 mg cm<sup>-2</sup>). This MXene-based hybrid material is a promising cathode host material for polysulfide-retention, enabling high-performance Na-S batteries.