期刊
NEW JOURNAL OF CHEMISTRY
卷 45, 期 29, 页码 13127-13136出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nj01841h
关键词
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资金
- National Natural Science Foundation of China [51271012]
- Open Project of State Key Laboratory of Metastable Materials Science and Technology [202103]
- Scientific and Technological Research Project of Colleges and Universities in Hebei Province of China [QN2019316]
The fabrication of core-shell heterostructured Ni3S2@polypyrrole (Ni3S2@PPy) nanotube aerogels showed superior performance as an anode material for lithium-ion batteries, with high reversible capacity, good rate capability, and improved cycling stability. Its low densities, large surface areas, and three-dimensional network features make them attractive for potential energy conversion/storage devices.
Building additional functionality into self-assembled conductive polymer nanotubes with high electrical conductivity, fast charge/discharge capability, and high mechanical strength is of great interest for energy storage materials and applications. Well-defined core-shell heterostructured Ni3S2@polypyrrole (Ni3S2@PPy) nanotube aerogels, hollow polypyrrole nanotubes wrapped by uniform Ni3S2 layers, were fabricated via a facile two-step process, chemical oxidative polymerization assisted by a lithocholic acid soft-template and a biomolecule-assisted hydrothermal process. With the unique core-shell nanotube network structure, the PPy nanotubes would offer the largest surface area, short paths for Li+ diffusion and numerous active sites, while the PPy nanotube matrix would prefer fast charge transportation and buffer the volume change of Ni3S2 during lithiation/delithiation processes. When directly used as an anode material for lithium-ion batteries, the as-prepared core-shell heterostructured Ni3S2@PPy nanotube aerogel electrode exhibits high reversible capacity, good rate capability, and improved cycling stability. A reversible capacity of 645.4 mA h g(-1) is sustained at a current density of 100 mA g(-1) after 1000 cycles, showing better cycling stability than the Ni3S2 powder pasted electrode. The low densities, large surface areas, and three-dimensional network features of the resulting Ni3S2@PPy nanotube aerogels render them attractive for potential energy conversion/storage devices.
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