Morphology-controlled Synthesis of Hollow Core-shell Structural α-MoO3-SnO2 with Superior Lithium Storage

doi:10.15541/jim20140612

Abstract

Abstract:

An effective approach of alcoholysis was employed to prepare hollow core-shell MoO₃-SnO₂ hybrid nanoparticle aggregates as anode materials for Li-ion batteries. The as-prepared samples were characterized by XRD, SEM, TEM, CV, and galvanostatical method. The results show that the unique hollow structures can shorten the distance Li-ion diffusion, and the hollow structure offers a sufficient void space, which sufficiently alleviates the mechanical stress caused by volume change. The as-obtained hollow core-shell MoO₃-SnO₂ hybrid electrodes can retain a discharge capacity of 865 mAh/g at current density of 50 mA/g after 100 charge-discharge cycles. Even at the current density of 1000 mA/g, the MoO₃-SnO₂ hybrid electrodes can still deliver a high reversible discharge capacity of 545 mAh/g. Therefore, the hollow MoO₃-SnO₂ hybrid electrode exhibits stable cyclability and good rate capability. This method is simple, low cost and mass-productive, and may also be used to prepare other advanced functional materials.

Key words: SnO2, MoO3, hollow core-shell materials, nanostructures, electrochemistry

CLC Number:

TQ174

WANG Ya-Peng, LIU Jia-Jia, LIU Chun-Xiao, CHEN Wei-Wei, LI Ting-Ting, GUO Hong. Morphology-controlled Synthesis of Hollow Core-shell Structural α-MoO₃-SnO₂ with Superior Lithium Storage[J]. Journal of Inorganic Materials, 2015, 30(9): 919-924.

Figures/Tables 7

Fig. 1 (A) XRD pattern of Mo-Sn-O samples prepared by alcoholysis synthesis process and subsequent calcination at 400 ℃, (B) FTIR spectra of the sample and its precursor, and the curve a and b corresponding to the Mo-Sn-O sample alcoholysis synthesis for 24 h and calcined at 400℃ and the precursor, respectively

Fig. 2 SEM (a-c), TEM (d-e) and HRTEM (f) images of Mo- Sn-O sample prepared by alcoholysis syntheses for 24 h and subsequent calcination at 400 ℃

Fig. 3 Nitrogen adsorption/desorption isotherm and Barrett- Joyner-Halenda (BJH) pore size distribution plot (inset) of the Mo-Sn-O samples prepared by alcoholysis syntheses for 24 h and subsequent calcination at 400 ℃

Fig. 4 SEM images of Mo-Sn-O samples after solvothermal alcoholysis at 180 ℃ for 6 h (a), 12 h (b), 18 h (c), 30 h (d), 36 h (e) and 48 h (f)

Scheme 1 Illustration of core-shell Mo-Sn-O@C hybrid nanoparticle aggregates synthesized by solvothermal alcoholysis

Fig. 5 Electrochemical performance of the prepared Mo-Sn-O materials electrode (a) Cycling performance of Mo-Sn-O materials prepared with different solvothermal alcoholysis time from 6 h to 48 h at constant current density of 200 mA/g; (b) charge/discharge curves of Mo-Sn-O (24 h) electrode for the 1st, 2nd, and 100th cycle at current density of 200 mA/g. The inset in (b) is the first cycle CV curve of f Mo-Sn-O (24 h) electrode with a scan rate of 0.05 mV/s; (c) Cycling performance of Mo-Sn-O (24 h) electrode at different current densities o. Electrode potential range of 0.01-3.0 V (vs Li/Li+)

Fig. 6 TEM image of hybrid hollow Mo-Sn-O hybrid electrodes after 100 charge-discharge cycles at current density of 500 mA/g

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Morphology-controlled Synthesis of Hollow Core-shell Structural α-MoO₃-SnO₂ with Superior Lithium Storage

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