期刊
ACS NANO
卷 13, 期 10, 页码 11500-11509出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b04977
关键词
sulfur-doping; MXene; sodium-sulfur batteries; sulfur loading; MXene/S cathodes
类别
资金
- Australian Research Council through the ARC Discovery projects [DP160104340, DP170100436, DP180102297]
- Rail Manufacturing Cooperative Research Centre projects [RMCRC1.1.2, RMCRC1.1.1]
Sodium-sulfur batteries using abundant elements offer an attractive alternative to currently used batteries, but they need better sulfur host materials to compete with lithium-ion batteries in capacity and cyclability. We report an in situ sulfur-doping strategy to functionalize MXene nanosheets by introducing heteroatomic sulfur into the MXene structure form the MAX phase precursor. By employing the vacuum freeze-drying method, a three-dimensional (3D) wrinkled MXene nanoarchitecture with the high specific surface area was prepared. The tailor-made wrinkled sulfur-doped MXene (S-Ti3C2Tx) nanosheets were applied as an electrode host material in room temperature sodium-sulfur batteries. The S-Ti3C2Tx matrix shows high polarity with sodium polysulfides, restricting the diffusion of sodium polysulfides. The MXene/sulfur electrode can achieve high areal sulfur loading up to 4.5 mg cm(-2) as well as good electrochemical performance (reversible capacity of 577 mAh g(-1) at 2 C after 500 cycles).
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