Journal
ACS NANO
Volume 15, Issue 10, Pages 16207-16217Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c05193
Keywords
Ti3C2Tx MXene; microsphere; heteroatom doped; polysulfide reservoir; sodium sulfur battery
Categories
Funding
- Australian Research Council [DP200101249, DP210101389]
- Rail Manufacturing Cooperative Research Centre project [RMCRC1.1.2]
- Jiangsu Specially Appointed Professor program
- National Natural Science Foundation of China [22005150]
- Natural Science Foundation of Jiangsu [BK20200825]
- Startup Foundation for Introducing Talent of NUIST
- Australian Research Council [DP200101249] Funding Source: Australian Research Council
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The study presents a design strategy using Ti3C2Tx MXene for encapsulation of sodium polysulfides to enhance the performance of sodium-sulfur batteries, demonstrating outstanding electrochemical performances with high reversible capacity and extended cycling stability.
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 Ti3C2Tx MXene. Porous nitrogen-doped Ti3C2Tx MXene microspheres have been synthesized by a facile synthesis method. Porous nitrogen-doped Ti3C2Tx 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(-1) at 0.5 C rate) and extended cycling stability (450.1 mAh g(-1) at 2 C after 1000 cycles at a high areal sulfur loading of 5.5 mg cm(-2)). This MXene-based hybrid material is a promising cathode host material for polysulfide-retention, enabling high-performance Na-S batteries.
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