期刊
SMALL
卷 16, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202004950
关键词
electrocatalysis; lithium− sulfur batteries; metal nitride; one‐ pot synthesis; porous graphitic carbon
类别
资金
- National Natural Science Foundation of China [51773211, 21961160700]
- National High Level Talents Special Support Plan of China
- Beijing Municipal Science & Technology Commission
The reaction kinetics of sulfur cathodes generally control the performance of lithium-sulfur (Li-S) batteries. Here, N-doped porous graphitic carbon with bound VN nanocrystals (3D VN@N-PGC), which is synthesized in one pot by heating a mixture of glucose as C source, urea as N source, and NH4VO3 as V source, is reported to be an superior electrocatalytic cathode host for Li-S batteries. Notably, the VN nanocrystals, strongly bound to the N-PGC network, form via in situ reactions among the thermolytic products of starting materials. The dopant N atoms and bound VN nanocrystals exhibit synergistic electrocatalytic effects to promote the cathode reactions of the Li-S cells. The observed enhancements are supported by density functional theory simulations and by the observation of electrocatalytic N- and V-intermediate species, via X-ray absorption near-edge structure spectroscopy. Li-S cells assembled using 3D VN@N-PGC as cathode host exhibit superior performance in terms of specific capacity (1442 mA h g(-1) at 0.1 C), rate capability (641 mA h g(-1) at 4 C), and cycle life (466 mA h g(-1) after 1700 cycles at 2 C, corresponding to a capacity decay of 0.020% per cycle). The one-pot methodology is facile and scalable and offers a new approach for synthesis of various metal nitride-containing materials for other electrocatalytic applications.
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