Two-dimensional Ti3C2Tx@S as cathode for room temperature sodium-sulfur batteries
Room temperature sodium-sulfur battery has special research value due to the low cost of sulfur resource and its high specific capacity. However, the cathode material of the room temperature sodium-sulfur battery mainly combines carbon materials and elemental sulfur now, and the utilization of the s...
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Veröffentlicht in: | Ionics 2019-11, Vol.25 (11), p.5373-5382 |
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Sprache: | eng |
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Zusammenfassung: | Room temperature sodium-sulfur battery has special research value due to the low cost of sulfur resource and its high specific capacity. However, the cathode material of the room temperature sodium-sulfur battery mainly combines carbon materials and elemental sulfur now, and the utilization of the sulfur is low. Herein, a two-dimensional layered material Ti
3
C
2
T
x
was prepared. The cathode material of Ti
3
C
2
T
x
@S was prepared by a simple melting method at 155 °C, and the mass percentage of the sublimed sulfur was 55%. Then, the valence states of Ti and C were characterized by XPS after loading the sublimed sulfur. The results indicated that a part of Ti
3+
turned into the Ti
4+
, and some C–S bonds were formed. Additionally, the electrochemical properties of Ti
3
C
2
T
x
@S were studied in sodium-ion battery under ambient conditions. The battery exhibited excellent rates performance, the first discharge specific capacity was 447.0 mAh g
−1
, and a specific capacity of 120.0 mAh g
−1
was maintained at the current density of 1000 mA g
−1
. In addition, Ti
3
C
2
T
x
@S demonstrated excellent cycle stability in room temperature sodium-sulfur battery. In the case of a current density of 100 mA g
−1
, the discharge specific capacity was maintained at 150.0 mAh g
−1
after 300 cycles, and the capacity retention rate was 80% from the second cycle. For the electrode, the specific capacity still remained 107.7 mAh g
−1
after 150 cycles. |
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ISSN: | 0947-7047 1862-0760 |
DOI: | 10.1007/s11581-019-03074-6 |