Journal
JOURNAL OF POWER SOURCES
Volume 402, Issue -, Pages 340-344Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.09.046
Keywords
Sodium ion batteries; ZnS; Embedded heterostructure; One-pot synthesis
Funding
- National Natural Science Foundation of China [51572129, 51602158, 51674147]
- International S&T Cooperation Program of China [2016YFE0111500]
- Natural Science Foundation of Jiangsu Province [BK20160835, BK20170036, BK20161544]
- Russian Foundation for Basic Research [16-29-06439]
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Herein, ZnS nanoparticles on Nitrogen (N) and Sulphur (S) co-doped carbon nanosheets (ZnS@NSC) are prepared through a highly efficient sol-gel synthesis. Interestingly, the ZnS nanoparticles are encapsulated in ultrathin carbon shells, which are crucial to buffer the volume changes of ZnS during sodium ion intercalation/de-intercalation. Meanwhile, the nanosheets and ultrafine carbon shells together constitute the N, S co-doped carbon framework, which not only can give rise to abundant active sites for sodium storage but also greatly enhance the electrical conductivity. As a result, the ZnS@NSC achieves a reversible capacity of 734 mAh g(-1) at 0.5 A g(-1) and excellent cycling stability (73.6% capacity retention after 380 cycles at 0.5 A g(-1)).
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