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Ultrasmall Fe₂O₃ nanoparticles/MoS₂ nanosheets composite as high-performance anode material for lithium ion batteries.

ABSTRACT: Coupling ultrasmall Fe₂O₃ particles (~4.0 nm) with the MoS₂ nanosheets is achieved by a facile method for high-performance anode material for Li-ion battery. MoS₂ nanosheets in the composite can serve as scaffolds, efficiently buffering the large volume change of Fe₂O₃ during charge/discharge process, whereas the ultrasmall Fe₂O₃ nanoparticles mainly provide the specific capacity. Due to bigger surface area and larger pore volume as well as strong coupling between Fe₂O₃ particles and MoS₂ nanosheets, the composite exhibits superior electrochemical properties to MoS₂, Fe₂O₃ and the physical mixture Fe₂O₃+MoS₂. Typically, after 140 cycles the reversible capacity of the composite does not decay, but increases from 829 mA h g^-1 to 864 mA h g^-1 at a high current density of 2 A g^-1. Thus, the present facile strategy could open a way for development of cost-efficient anode material with high-performance for large-scale energy conversion and storage systems.

SUBMITTER: Qu B

PROVIDER: S-EPMC5316998 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Bagasse-derived carbon electrodes were developed by doping with nitrogen functional groups and compositing with high-capacity MnO2 nanoparticles (MnO2/NBGC). The bagasse-derived biochar was N-doped by refluxing in urea, followed by the deposition of MnO2 nanoparticles onto its porous surface via the hydrothermal reduction of KMnO4. Different initial KMnO4 loading concentrations (i.e. 5, 10, 40, and 100 mM) were applied to optimize the composite morphology and the corresponding electrochemical performance. Material characterization confirmed that the carbon composite has a mesoporous structure along with the dispersion of MnO2 nano-particles on the N-containing carbon surface. It was found that the 5-MnO2/NBGC sample exhibited the highest electrochemical performance with a reversible capacity of 760 mA h g-1 at a current density of 186 mA g-1. It delivered reversible capacities of 488 and 390 mA h g-1 in cycle tests at 372 and 744 mA g-1, respectively, for 150 cycles and presented good reversibility with nearly 100% coulombic efficiency. In addition, it could exert high capacities up to 388 and 301 mA h g-1 even under high current densities of 1860 and 3720 mA g-1, respectively. Moreover, most of the prepared composite products showed high rate capability with great reversibility up to more than 90% after testing at a high current density of 3720 mA g-1. The great electrochemical performance of the MnO2/NBGC nanocomposite electrode can be attributed to the synergistic impact of the hierarchical architecture of the MnO2 nanocrystals deposited on porous carbon and the capacitive effect of the N-containing defects within the carbon material. The nanostructure of the MnO2 particles deposited on porous carbon limits its large volume change during cycling and promotes good adhesion of MnO2 nanoparticles with the substrate. Meanwhile, the capacitive effect of the exposed N-functional groups enables fast ionic conduction and reduces interfacial resistance at the electrode interface.

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Ultrasmall Fe₂O₃ nanoparticles/MoS₂ nanosheets composite as high-performance anode material for lithium ion batteries.

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Ultrasmall Fe₂O₃ nanoparticles/MoS₂ nanosheets composite as high-performance anode material for lithium ion batteries.