期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 871, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159576
关键词
Lithium-sulfur batteries; Heterostructure; Carbon layer; Catalyzation
资金
- Natural Science Foundation of Hebei Province of China [E2019202269, B2019202277]
- College Science Research Project of Hebei Province of China [ZD2019030]
- Science and Technology Planning Project of Tianjin of China [20YDTPJC00210]
- Ministry of Education and Science of the Republic of Kazakhstan [AP09259764]
The novel Ni/Ni2P@C hollow heterostructure microsphere, prepared by a facile approach, acts as a functional sulfur host material and significantly improves the electrochemical performance of Li-S batteries, exhibiting high discharge capacity, rate capability, and reversible capacity.
Lithium-sulfur (Li-S) batteries present the potential viable rechargeable batteries in the field of energy-storage devices. However, the migration of lithium polysulfides (LiPSs) and slow electrochemical reaction kinetics are still the intractable problems on the development of Li-S batteries. Herein, novel Ni/Ni2P@C hollow heterostructure microsphere, as the functional sulfur host material, is prepared by a facile approach. The study found that the novel hollow microsphere composed of porous carbon layer alleviates the volume expansion effect and effectively improves the electron transport during cycling process. In addition, the Ni/Ni2P heterostructure wrapped in carbon layer not only improves the adsorption of LiPSs, but also catalyzes their conversion reactions. Therefore, Li-S batteries with the S/Ni/Ni2P@C electrode exhibit high discharge capacity of 1187.3 mAh g(-1) at 0.2 C in the first cycle, notable rate capability of 716.9 mAh g(-1) at 3 C and outstanding reversible capacity of 636.6 mAh g(-1) over the 500 cycles at 1 C. Owing to these excellent electrochemical performances, the Ni/Ni2P@C hollow heterostructure microsphere has promising applications for Li-S batteries. (C) 2021 Published by Elsevier B.V.
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