期刊
SCIENCE BULLETIN
卷 65, 期 17, 页码 1460-1469出版社
ELSEVIER
DOI: 10.1016/j.scib.2020.05.006
关键词
Coordination polymer nanofiber; Metallic sulfides; Hierarchical hollow architecture; One-pot synthesis; Lithium/sodium-ion storage
资金
- National Natural Science Foundation of China [51673117, 21805193, 51973118]
- Postdoctoral Science Foundation of China [2019M650212]
- Key R&D Program of Guangdong Province [2019B010929002, 2019B010941001]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20170817094628397, JCYJ20170818093832350, JCYJ2017081 8112409808, JCYJ20170818100112531, JCYJ20180507184711069, JCYJ20180305125319991]
Multicomponent metal sulfides have been recognized as promising anode materials for lithium/sodiumion storage given their enticing theoretical capacities. However, the simplification of synthetic processes and the construction of heterogeneous interfaces of multimetal sulfides remain great challenges. Herein, a hierarchical 1T-MoS2/carbon nanosheet decorated Co1-xS/N-doped carbon (Co1-xS/NC@MoS2/C) hollow nanofiber was designed and constructed via a one-pot hydrothermal method using a cobalt-based coordination polymer nanofiber. This nanofiber can transform in-situ into conductive N-doped carbon hollow fibers embedded with active Co1-xS nanoparticles, enabling the epitaxial growth of MoS2 nanosheets. Consequently, the Co1-xS/NC@MoS2/C composites achieve exceptional lithium/sodium-ion storage performance. Compared to MoS2/C microspheres and Co1-xS/NC hollow nanofibers alone, the Co1-xS/ NC@MoS2/C hollow nanofibers deliver higher discharge capacities (1085.9 mAh g(-1) for lithium-ion batteries (LIBs) and 748.5 mAh g(-1) for sodium-ion batteries (SIBs) at 100 mA g(-1)), better capacity retention (910 mAh g(-1) for LIBs and 636.5 mAh g(-1) for SIBs after 150 cycles at 100 mA g(-1)), and increased cycling stability (407.2 mAh g(-1) after 1000 cycles for SIBs at 1000 mA g(-1)). Furthermore, the kinetic analysis shows that the lithium/sodium-ion storage processes of the Co1-xS/NC@MoS2/C electrode are mainly controlled by pseudocapacitance behavior. The excellent electrochemical properties can thus be ascribed to the synergy of the MoS2/C nanosheets with the enlarged interlayer spacing, good conductivity of the carbon layers, and the Co1-xS nanoparticles embedded in the hollow nanofibers with extensive reaction sites. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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