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Issue 11, 2012
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In situ synthesis of a graphene/titanium nitride hybrid material with highly improved performance for lithium storage

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Abstract

A graphene/titanium nitride (G/TiN) hybrid as an anode material of lithium ion batteries is prepared by a simple in situhydrolysis method combined with ammonia annealing. TiN nanoparticles as obtained are ∼5 nm in size and homogeneously anchored on G. The G/TiN hybrid anode delivers a reversible capacity as high as 646 mA h g−1 at 20 mA g−1 and exhibits an enhanced initial coulombic efficiency of 75%, much higher than that of pure graphene (G: 52%) in the first cycle. The capacity retention is as much as 86% after 200 cycles. At a current density of 2000 mA g−1, the hybrid anode still retains 325 mA h g−1 while that of G is only 98 mA h g−1. It is demonstrated that the G/TiN hybrids display a superior electrochemical performance owing to the highly efficient mixed (electron and Li+) conducting network. The internal defects between G layers induced by nitrogen-doping in G/TiN may improve reversible Li storage, whereas the catalytic sites on the surface of G related to the decomposition of the electrolyte may be occupied by TiN, leading to a decreased irreversible capacity. Moreover, the formation of Li3N in the interface is beneficial to interface transport, which is confirmed by aberration-corrected scanning transmission electron microscopy. The anchoring of TiN nanoparticles on G is promising prospect for energy storage applications in high performance lithium-ion batteries.

Graphical abstract: In situ synthesis of a graphene/titanium nitride hybrid material with highly improved performance for lithium storage

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Publication details

The article was received on 24 Nov 2011, accepted on 23 Dec 2011 and first published on 31 Jan 2012


Article type: Paper
DOI: 10.1039/C2JM16128A
Citation: J. Mater. Chem., 2012,22, 4938-4943
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    In situ synthesis of a graphene/titanium nitride hybrid material with highly improved performance for lithium storage

    Y. Yue, P. Han, X. He, K. Zhang, Z. Liu, C. Zhang, S. Dong, L. Gu and G. Cui, J. Mater. Chem., 2012, 22, 4938
    DOI: 10.1039/C2JM16128A

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