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Issue 43, 2016
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Ag quantum dots promoted Li4Ti5O12/TiO2 nanosheets with ultrahigh reversible capacity and super rate performance for power lithium-ion batteries

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Abstract

Spinel Li4Ti5O12 (LTO) has been widely studied as a promising anode material due to its outstanding structural stability and remarkable safety. However, the poor electron conductivity and low lithium-ion diffusion coefficient seriously limit its rate capability for the application in power lithium-ion batteries (LIBs). Herein, we demonstrate rationally designed Ag quantum dot (QD) modified LTO/TiO2 nanosheets (Ag-LTO/TiO2 NSs) synthesized via a facile hydrothermal process followed by heat treatment, highlighting simultaneously the promotion of electron conductivity and lithium-ion diffusion coefficient. The newly prepared Ag-LTO/TiO2 NSs deliver an ultrahigh reversible capacity of 177 mA h g−1 at 0.5C and a superior rate performance of more than 148 mA h g−1 at 30C between 1.0 and 2.5 V. The achieved superior electrochemical performance largely surpasses that of the state-of-the-art LTO-based materials for LIBs. The present work provides a facile yet effective approach to significantly boost the high rate capability of LTO/TiO2 composites. These novel quantum dot modified 2-dimensional (2D) materials will pave the way to a new family of carbon-free anode materials in response to the increasing demands for high-power energy storage.

Graphical abstract: Ag quantum dots promoted Li4Ti5O12/TiO2 nanosheets with ultrahigh reversible capacity and super rate performance for power lithium-ion batteries

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Publication details

The article was received on 11 Aug 2016, accepted on 05 Oct 2016 and first published on 06 Oct 2016


Article type: Paper
DOI: 10.1039/C6TA06874J
Citation: J. Mater. Chem. A, 2016,4, 16886-16895
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    Ag quantum dots promoted Li4Ti5O12/TiO2 nanosheets with ultrahigh reversible capacity and super rate performance for power lithium-ion batteries

    H. Ge, L. Cui, B. Zhang, T. Ma and X. Song, J. Mater. Chem. A, 2016, 4, 16886
    DOI: 10.1039/C6TA06874J

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