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In-situ constructing of mesoporous Li4Ti5O12@rGO hybrid spheres as anode materials for lithium-ion batteries

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Abstract

The Li4Ti5O12@rGO (LTO@rGO) mesoporous hybrid spheres have been successfully synthesized by an in-situ conversion route in aqueous LiOH solution using TiO2 spheres as precursor, which was followed by annealing process in Ar atmosphere. The LTO@rGO composites possess a uniform mesoporous spherical structure with diameter of approximately 800 nm, which are assembled by many interconnected nanoparticles with a thin rGO conductive coating. Benefiting from the synergistic effects of the unique nanostructure hybrids, it is proved that the porous can offer large surface area which has high intrinsic interfacial reactivity with the electrolyte, extra space for the storage of Li+, and short transport distances for both e− and Li+. Meanwhile, the rGO coating could enhance effectively the interfacial contact between particles and create a three-dimensional conductive network to greatly facilitate fast transport of e− and Li+, which can improve the rate capacity. Compared with pure LTO, the as-prepared LTO@rGO mesoporous hybrid spheres deliver a higher reversible capacity of 260.1 mAh g−1 at 0.5 C after 500 cycles with highly stable capacity retention of even more than 100%, and the high rate discharge capacity reach 125.9 mAh g−1 at 10 C. Therefore, the LTO@rGO composites display superior high-rate property and ultralong cycling stability, which can provide a potential anode material for LIBs.

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Acknowledgments

This study received financial support from the National Science Foundation of China (51272147), the Natural Science Foundation of Shaanxi Province (2015JM5208), and the Graduate Innovation Found of Shaanxi University of Science and Technology.

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  1. School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an, 710021, China

    Yanqi Feng, Hui Liu & Xiangnan Zhao

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  1. Yanqi Feng
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Correspondence to Hui Liu.

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Feng, Y., Liu, H. & Zhao, X. In-situ constructing of mesoporous Li4Ti5O12@rGO hybrid spheres as anode materials for lithium-ion batteries. Ionics 26, 2791–2801 (2020). https://doi.org/10.1007/s11581-020-03466-z

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