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  • Green and economical synthesis of carbon-coated MoO2 nanocrystallines with highly reversible lithium storage capacity.

Green and economical synthesis of carbon-coated MoO2 nanocrystallines with highly reversible lithium storage capacity.

Journal of nanoscience and nanotechnology (2014-04-18)
Xiaohong Sun, Yifeng Shi, Xiangpeng Fang, Huiming Ji, Xiaolei Li, Shu Cai, Chunming Zheng, Yongsheng Hu
ABSTRACT

Carbon-coated MoO2 nanocrystallines with uniform particle size and carbon-coating morphology have been fabricated by a green and economical hydrothermal route and carbonization process. Glucose here acts as a multifunctional agent, not only as the reducing species to prepare MoO2, but also as the carbonaceous precursor and coating agent to form the carbon-coated and nanoscale MoO2 crystallines. The electrochemical tests demonstrate that the as-synthesized carbon-coated MoO2 nanocrystallines exhibit high capacity and excellent capacity retention as an anode material for lithium-ion batteries. The specific discharge capacity is as high as 790 mA h g(-1) in the first cycle and 730 mA h g(-1) over 50 cycles. The significant enhancement in the electrochemical Li storage performance is attributed to the synergistic effect of the nanocrystallines structure with small particle size and uniform carbon-coating shell, which reduces the diffusion distance for Li-ion and electron, provides high electric conductivity and relieves the volume effect during the cycling.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Lithium, ribbon, thickness × W 0.38 mm × 23 mm, 99.9% trace metals basis
Sigma-Aldrich
Lithium, granular, 4-10 mesh particle size, high sodium, 99% (metals basis)
Sigma-Aldrich
Molybdenum, foil, thickness 0.025 mm, ≥99.9% trace metals basis
Sigma-Aldrich
Molybdenum, foil, thickness 0.1 mm, ≥99.9% trace metals basis
Sigma-Aldrich
Lithium, rod, diam. 12.7 mm, 99.9% trace metals basis
Sigma-Aldrich
Lithium, granular, 99% trace metals basis
Sigma-Aldrich
Molybdenum, foil, thickness 1.0 mm, ≥99.9% trace metals basis
Sigma-Aldrich
Lithium, ribbon, thickness × W 0.75 mm × 19 mm, 99.9% trace metals basis
Sigma-Aldrich
Lithium, wire, diam. 3.2 mm, in mineral oil, ≥98%
Sigma-Aldrich
Lithium, wire (in mineral oil), diam. 3.2 mm, 99.9% trace metals basis
Sigma-Aldrich
Lithium, ribbon, thickness × W 1.5 mm × 100 mm, 99.9% trace metals basis
Sigma-Aldrich
Lithium, ribbon, thickness × W 0.75 mm × 45 mm, 99.9% trace metals basis
Molybdenum, foil, 6mm disks, thickness 0.0125mm, 99.9%
Molybdenum, foil, 4mm disks, thickness 0.005mm, 99.9%
Molybdenum, foil, 6mm disks, thickness 0.015mm, annealed, 99.9%
Molybdenum, foil, 4mm disks, thickness 0.30mm, annealed, 99.9%
Molybdenum, foil, 50mm disks, thickness 0.025mm, annealed, 99.9%
Molybdenum, foil, 15mm disks, thickness 0.025mm, annealed, 99.9%
Molybdenum, foil, 25mm disks, thickness 0.20mm, annealed, 99.9%
Molybdenum, foil, 25mm disks, thickness 0.020mm, annealed, 99.9%
Molybdenum, foil, 6mm disks, thickness 0.075mm, annealed, 99.9%
Molybdenum, foil, 25mm disks, thickness 0.01mm, 99.9%
Molybdenum, foil, 50mm disks, thickness 0.25mm, annealed, 99.9%
Molybdenum, foil, 1m coil, thickness 0.04mm, coil width 0.7mm, annealed, 99.9%
Molybdenum, foil, 25mm disks, thickness 0.025mm, annealed, 99.9%
Molybdenum, foil, 50mm disks, thickness 0.30mm, annealed, 99.9%
Molybdenum, foil, 4mm disks, thickness 0.020mm, annealed, 99.9%
Molybdenum, foil, 1m coil, thickness 0.01mm, 99.9%
Molybdenum, foil, 6mm disks, thickness 0.006mm, 99.9%
Molybdenum, foil, 6mm disks, thickness 0.025mm, annealed, 99.9%