| Autor: |
Baheri, Yalda Tarpoudi, Hedayati, Mohammad Ali, Maleki, Mahdi, Karimian, Hossein |
| Zdroj: |
Jouranl of Energy Storage; September 2023, Vol. 68 Issue: 1 |
| Abstrakt: |
Although molybdenum disulfide (MoS2) has been nominated as a high theoretical capacity anode material for lithium-ion batteries (LIBs), intrinsic low electrical conductivity and massive volume expansion are significant obstacles to its application investment. Herein, a novel synthesis method has been developed to prepare the carbon foam/MoS2(CF/MoS2) nanocomposite through an in-situ vapor-liquid-solid (VLS) mechanism to overcome its inherent disadvantages as a LIBs anode. A newfound MoS-polyHIPE, polyHIPE containing Mo and S precursors, was synthesized to provide the reaction confinement spaces. The in-situ reaction between sodium molybdate melt and gaseous sulfur products derived from decomposing the S precursor in the highly nanoporous polymer during low-temperature pyrolysis (700 °C) led to the precipitation of MoS2nanoparticles in the carbon backbone. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman analysis demonstrated the formation of 1T/2H-MoS2. The TEM and HAADF-STEM micrographs revealed the ultra-small MoS2nanoparticles with a hollow spherical shape well-distributed in the carbon framework. The unique composite structure of the homogeneously dispersed tiny nanoparticles in a nanoporous matrix caused fast diffusion of lithium ions, separated MoS2nanoparticles without aggregation, and structural stability. The prepared composite exhibited a high specific capacity of 1051 mAh g−1after 100 charge/discharge cycles. The composite also exhibited a significant specific capacity of 600 mAh g−1at the high current density of 3C as an anode material for LIBs. |
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