TiO2/MoO2 nanocomposite as anode materials for high power Li-ion batteries with exceptional capacity

Dustin Bauer, Alexander J. Roberts, Chris L. Starkey, Raman Vedarajan, Dan J.L. Brett, Paul R. Shearing, Noriyoshi Matsumi, Jawwad A. Darr

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Abstract

Nanoparticles of molybdenum(IV) oxide (MoO2) and a TiO2/MoO(2)nanocomposite were synthesised via a continuous hydrothermal synthesisprocess. Both powders were analysed using XRD, XPS, TEM, and BET andevaluated as active materials in anodes for Li-ion half-cells. Cyclicvoltammetry and galvanostatic charge/discharge measurements were carriedout in the potential window of 0.1 to 3.0 V vs. Li/Li+. Specificcapacities of ca. 350 mAh g(-1) were obtained for both materials at lowspecific currents (0.1 A g(-1)); TiO2/MoO(2 )composite electrodes showedsuperior rate behaviour & stability under cycling (compared to MoO2),with stable specific capacities of ca. 265 mAh g(-1) at a specificcurrent of 0.5 A g(-1) and ca. 150 mAh g(-1) after 350 cycles at aspecific current of 2.5 A g(-1). The improved performance of thecomposite material, compared to MoO2, was attributed to a smallerparticle size, improved stability to volume changes (during cycling),and lower charge transfer resistance during cycling. Li-ion hybridelectrochemical capacitors using TiO2/MoO2 composite anodes andactivated carbon (AC) cathodes were evaluated and showed excellentperformance with an energy density of 44 Wh kg(-1) at a power density of600 W kg(-1).
Original languageEnglish
Pages (from-to)5120-5140
Number of pages21
JournalInternational Journal of Electrochemical Science
Volume13
DOIs
Publication statusPublished - 10 Apr 2018

Bibliographical note

© 2018 The Authors. Published by ESG (www.electrochemsci.org). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

Keywords

  • Composite anode materials
  • Continuous hydrothermal flow synthesis
  • Molybdenum oxide
  • Pseudocapacitance
  • Supercabattery

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