Facile Synthesis of Reduced Graphene Oxide In-situ Wrapped MnTiO3 Nanoparticles for Excellent Lithium Storage

doi:10.15541/jim20180143

Abstract

Abstract:

The stable high-capacity anode has been an urgent demand for high energy density lithium-ion batteries (LIBs). Herein, a simple and effective strategy to synthesize high-performance reduced graphene oxide (rGO) in-situ wrapped MnTiO₃ nanoparticles (MnTiO₃@rGO) by Sol-Gel method is designed. The MnTiO₃ nanoparticles are uniformly dispersed and wrapped by few-layer graphene. Due to high conductivity of rGO, MnTiO₃@rGO nanoparticles show excellent rate performance, with a specific capacity of 286 mAh·g^-1 being displayed at the higher rate of 5.0 A·g^-1. Moreover, benefited from porous structure and flexible rGO shell, the MnTiO₃@rGO anode delivers a remarkable long-term cycling stability. The specific capacity maintains 441 mAh·g^-1 after 500 cycles at 0.5 A·g^-1, only losing 8.4%. Therefore, the results demonstrate that the facile synthetic strategy is highly desirable for improving the conductivity and stability of metal oxide anodes.

Key words: in-situ wrapped, reduced oxide graphene, MnTiO₃ nanoparticles, lithium-ion batteries anode

CLC Number:

TQ174

LIU Huan-Long, ZHAO Wei, LI Rui-Zhe, HUANG Xie-Yi, TANG Yu-Feng, LI Dong-Mei, HUANG Fu-Qiang. Facile Synthesis of Reduced Graphene Oxide In-situ Wrapped MnTiO₃ Nanoparticles for Excellent Lithium Storage[J]. Journal of Inorganic Materials, 2018, 33(9): 1022-1028.

Figures/Tables 5

Fig. 1 (a) SEM image with inset showing the optical photograph of MnTiO3@rGO powder, (b) TEM image, (c) HRTEM image, and (d) SAED pattern, (e) high-angle annular dark field (HAADF) of MnTiO3@rGO, and EDS mapping of C, Mn, Ti, and O elements which indicates uniformly elemental distribution in the MnTiO3@rGO

Table 1 EDS data of MnTiO3@rGO

Materials	C/wt%	O/wt%	Ti/wt%	Mn/wt%
MnTiO₃@rGO	9.01	18.87	32.11	40.01

Fig. 2 (a) XRD patterns, (b) Raman spectra in the range of 100-2000 cm-1, (c) nitrogen sorption isotherms and corresponding pore size distribution curves (inset), and (d) electrical conductivity of as-obtained materials

Fig. 3 Electrochemical measurements of samples(a) CV curves of MnTiO3@rGO electrode; (b) Comparison of the specific capacity at different rates; (c) Cycling performance at 0.5 A·g-1 between MnTiO3@rGO, rGO and MnTiO3 electrodes; (d) Nyquist plots of electrodes of MnTiO3@rGO and MnTiO3 after 3 cyclingAll of the measurements were conducted using a voltage window of 0.01 V-3.0 V

Fig. 4 (a) Capacity retention curves versus various current densities, and (b) capacity retention curves versus various cycles of MnTiO3@rGO anodes

References 35

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Facile Synthesis of Reduced Graphene Oxide In-situ Wrapped MnTiO₃ Nanoparticles for Excellent Lithium Storage

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