Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 30, Pages 15002-15011Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta04916f
Keywords
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Funding
- National Key Research and Development Program of China [2019YFA0705601]
- Anhui Provincial Natural Science Foundation [1808085QE124, 1808085MB40]
- Natural Science Foundation in University of Anhui Province [KJ2018A0548]
- National Natural Science Foundation of China [21878308, 21890762, 21808220]
- Talent Scientific Research Foundation of Hefei University [16-17RC15]
- Key Research Program of Frontier Sciences [QYZDY-SSW-JSC011]
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Na-related anodes with excellent rate capability and ultra-stable cyclability are being pursued significantly to overcome the slow kinetics of currently available compounds on account that the sodium-ion battery is an ideal energy storage device technology for grid-scale electricity networks. Herein, we demonstrate a novel concept for the construction of a nanoarchitecture with robust charge transfer networks, which is composed of MoS2/C superstructure nanoflowers embedded in carbon nanonets (MoS2/C-CNNs). Impressively, the optimized nanoarchitecture exhibited an ultra-fast Na-ion storage feature, a superior reversible capacity of 245.2 mA h g(-1)at 5 A g(-1), and a promising retention of 78.9% after 8000 cycles. The interconnected 3D carbon nanonetworks, derived from the carbonization of sugarcane bagasseviaa novel self-splitting process, were found to be extremely beneficial for the acceleration of electron transport and Na(+)diffusion, while alleviating the volumetric strain of MoS(2)during the Na(+)insertion/extraction processes. Furthermore, computational analysis was performed to reveal the underlaid mechanism, demonstrating that the MoS2/C superstructures can significantly ameliorate the electronic conductivity of MoS(2)and lower the Na(+)diffusion barrier, which tend to facilitate the electron and Na(+)transport at the atomic level. This work demonstrates that the construction of robust 3D ion/electron traffic networks at various scales is an efficient strategy to develop electrodes with adequate rate capability and remarkable cyclability.
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