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3D Pomegranate-like TiN@graphene Composites with Electrochemical Reaction Chamber as the Sulfur Host for Ultralong-life Lithium-Sulfur Batteries

Abstract

ABSTRACT: The low loading and poor cyclic performance of sulfur cathodes are among the critical barriers restricting the practical application of lithium-sulfur (Li-S) batteries. The rational design of composites consisting of transition metals and conductive nanocarbon is considered an effective strategy to construct cathode materials for Li-S batteries with excellent cyclic stability and rate capability. Herein, we propose a spray drying method to fabricate 3D pomegranate-like titanium nitride (TiN)@graphene composites as a host for sulfur cathode. The hollow spheres are coated with graphene layers to form a shell, serving as a highly efficient electrochemical reaction chamber and a reservoir for polysulfides. The TiN@graphene/S electrode exhibits an excellent capacity of 810 mAh g-1 after 200 cycles at 0.5 C. The cathodes with high areal sulfur loadings of 2.8 and 3.6 mg cm-2 maintained remarkable capacities of 568 and 515 mAh g-1, respectively, after 500 cycles. The TiN hollow spheres not only accommodate large volume expansion of sulfur, but could also improve the conversion of polysulfides during the discharge/charge process. The excellent electrical conductivity of the few-layered graphene shell facilitates electron transport and maintains structural stability. This work offers a strategy to combine inorganic compounds and nanocarbon as sulfur hosts to improve the electrochemical properties of Li-S batteries.

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Publication details

The article was received on 08 Oct 2018, accepted on 05 Dec 2018 and first published on 06 Dec 2018


Article type: Communication
DOI: 10.1039/C8NH00343B
Citation: Nanoscale Horiz., 2018, Accepted Manuscript
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    3D Pomegranate-like TiN@graphene Composites with Electrochemical Reaction Chamber as the Sulfur Host for Ultralong-life Lithium-Sulfur Batteries

    Y. Luo, R. Luo, Q. Yu, Y. Lu, M. Zhang, T. Peng, H. yan, X. Liu and J. Kim, Nanoscale Horiz., 2018, Accepted Manuscript , DOI: 10.1039/C8NH00343B

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