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Issue 45, 2015
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Highly pseudocapacitive Nb-doped TiO2 high power anodes for lithium-ion batteries

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Abstract

Nb-doped TiO2 (anatase) nanoparticles were synthesized using a continuous hydrothermal flow synthesis reactor using a supercritical water flow as a reagent and crystallizing medium. The as-prepared nano-powders with ca. 25 at% Nb5+ (<6 nm diameter) were used as possible anodes for lithium-ion batteries without any further heat-treatment. Cyclic voltammetry and galvanostatic charge/discharge cycling tests were performed in the range of 1.2 to 3.0 V vs. Li/Li+. The Nb-doped TiO2 samples showed superior capacity retention at high current rates compared to the corresponding undoped nano-TiO2. The superior performance of the doped samples (at specific currents up to 15 A g−1) was attributed to higher electronic conductivity and a greater charge storage contribution from surface effects like pseudocapacitance (Faradaic processes) as well as Helmholtz double layer charge storage.

Graphical abstract: Highly pseudocapacitive Nb-doped TiO2 high power anodes for lithium-ion batteries

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Publication details

The article was received on 21 Sep 2015, accepted on 29 Sep 2015 and first published on 01 Oct 2015


Article type: Paper
DOI: 10.1039/C5TA07554H
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Citation: J. Mater. Chem. A, 2015,3, 22908-22914
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    Highly pseudocapacitive Nb-doped TiO2 high power anodes for lithium-ion batteries

    M. Lübke, J. Shin, P. Marchand, D. Brett, P. Shearing, Z. Liu and J. A. Darr, J. Mater. Chem. A, 2015, 3, 22908
    DOI: 10.1039/C5TA07554H

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