Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 825, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.153901
Keywords
Doping; Self-supporting; Bi2S3; Carbon foam; Sodium ion batteries
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Funding
- Sate Key Program of National Natural Science of China [51532005]
- National Natural Science Foundation of China [51472148, 51802175, 51272137]
- Nature Science Foundation of Shandong Province [ZR2019BEM019]
- Tai Shan Scholar Foundation of Shandong Province
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Taking advantage of nano-sized active materials, doping and self-supporting, Se-doped Bi2S3/3D carbon foam (Bi2S3-xSex/CF) is synthesized through a pyrolysing-hydrothermal-heating three-steps process. The as-synthesized Bi2S3-xSex/CF hybrid exhibits a significant improvement in electrochemical performance, showing a high specific capacity of 441.8 mAh g(-1) after 100 cycles with the coulombic efficiency approximating to 100%. The special nanoneedle-like structure of Bi2S3 makes for shortening ion transmission distance, minishing the mechanical stress and thus improving the electrochemical performance. And the introduction of Se can enhance the specific capacity, cycling stability and rate performance by improving of electronic conductivity and forming Se-contained inactive phase during alloying process. Furthermore, the self-supporting electrode is beneficial to simplify preparation process and reduce the loss of volume energy density. The strategy presented in this paper to improve the electrochemical performance of secondary ions battery can be also applied to other novel electrodes materials. (C) 2020 Elsevier B.V. All rights reserved.
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