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TiO2 nanocrystals-embedded sulfur-doped porous carbon as high-performance and long-life anode material for sodium-ion batteries

Abstract

TiO2 is now developed as a low-cost and high-security anode material for sodium-ion batteries (SIBs), but its low sodium ion diffusion ability and poor electrical conductivity hinder its sodium-storage performance. In this work, TiO2 nanocrystals-embedded sulfur-doped porous carbon (TSPC) was synthesized through a solvothermal synthesis of metal-organic framework MIL-125(Ti) precursor and subsequent pyrolysis with inorganic sulfur powders under nitrogen atmosphere. The inner TiO2 nanocrystals enlarge the electrode/electrolyte interface and shorten the diffusion distance of sodium ions, while the sulfur-doped porous carbon enhances the electron transport ability, inhibits the aggregation of TiO2 nanocrystals, and offers more reaction sites for sodium storage. Benefiting from the synergetic effects between TiO2 nanocrystals and sulfur-doped porous carbon, when used as anode material for SIBs, the TSPC demonstrates an ultrahigh specific capacity of 323 mA h g-1 after 100 cycles at 50 mA g-1 and extraordinary cycling stability with a capacity retention of 80.1% after 1500 cycles. The TSPC should be a promising anode material for high-performance SIBs.

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Publication details

The article was received on 13 Jun 2018, accepted on 02 Nov 2018 and first published on 03 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA05617J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    TiO2 nanocrystals-embedded sulfur-doped porous carbon as high-performance and long-life anode material for sodium-ion batteries

    J. Li, X. Zhang, L. Han, D. Yan, S. Hou, T. Lu, Y. Yao and L. Pan, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05617J

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