期刊
FRONTIERS IN CHEMISTRY
卷 6, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2018.00236
关键词
tungsten disulfide; N-doped carbon; nanosheets; sodium ion batteries; electrochemical performances
资金
- National Natural Science Foundation of China [21603157]
- Natural Science Foundation of Jiangsu Province [BK20150311]
- College Natural Science Foundation of Jiangsu Province [16KJB430025]
- Postdoctoral Science Foundation of China [2016T90488, 2015M580459]
- Henan International Cooperation Project in Science and Technology [134300510051]
- Plan for Scientific Innovation Talent of the Henan Province [144200510009, 144100510015]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_16R21]
- Program for Science and Technology Innovation Talents in Universities of Henan Province [17HASTIT026]
- Program for Science and Technology Innovation Team of Henan University of Science and Technology [2015XTD006]
- Scientific and Technological Project of Henan Province [182102210297]
- Scientific Research Starting Foundation for Ph.D. of Henan University of Science and Technology [13480065]
- Science Foundation for Youths of Henan University of Science and Technology [2013QN006]
- High-end Foreign Experts Recruitment Program [GDW2017410125]
Due to the cost-effectiveness of sodium source, sodium-ion batteries (SIBs) have attracted considerable attention. However, SIBs still have some challenges in competing with lithium-ion batteries for practical applications. Particularly, the high rate capability and cycling stability are posing big problems for SIBs. Here, nitrogen-doped carbon-coated WS2 nanosheets (WS2/NC) were successfully synthesized by a high-temperature solution method, followed by carbonization of polypyrrole. When used as anode electrodes for SIBs, WS2/NC composite exhibited high-rate capacity at 386 and 238.1 mAh g(-1) at 50 and 2,000 mA g(-1), respectively. Furthermore, even after 400 cycle, the composite electrode could still deliver a capacity of similar to 180.1 mAh g(-1) at 1,000 mA g(-1), corresponding to a capacity loss of 0.09% per cycle. The excellent electrochemical performance could be attributed to the synergistic effect of the highly conductive nature of the nitrogen-doped carbon-coating and WS2 nanosheets. Results showed that the WS2/NC nanosheets are promising electrode materials for SIBs application.
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