期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 16, 页码 6459-6465出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201916370
关键词
kinetics; K-ion batteries; nanoengineering; single-atom Ni; small-molecule sulfur
资金
- National Natural Science Foundation of China [21701163, 21671181, 21831006]
- Anhui Provincial Natural Science Foundation [1808085QB25]
An amidation-dominated re-assembly strategy is developed to prepare uniform single atom Ni/S/C nanotubes. In this re-assembly process, a single-atom design and nano-structured engineering are realized simultaneously. Both the NiO5 single-atom active centers and nanotube framework endow the Ni/S/C ternary composite with accelerated reaction kinetics for potassium-ion storage. Theoretical calculations and electrochemical studies prove that the atomically dispersed Ni could enhance the convention kinetics and decrease the decomposition energy barrier of the chemically-absorbed small-molecule sulfur in Ni/S/C nanotubes, thus lowering the electrode reaction overpotential and resistance remarkably. The mechanically stable nanotube framework could well accommodate the volume variation during potassiation/depotassiation process. As a result, a high K-storage capacity of 608 mAh g(-1) at 100 mA g(-1) and stable cycling capacity of 330.6 mAh g(-1) at 1000 mA g(-1) after 500 cycles are achieved.
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