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Mixed molybdenum and vanadium oxide nanoparticles with excellent high-power performance as Li-ion battery negative electrodes

DOI: 10.1016/j.electacta.2019.134695 DOI Help

Authors: Dustin Bauer (University College London (UCL); Japan Advanced Institute of Science and Technology) , Thomas E. Ashton (University College London (UCL)) , Dan J. L. Brett (University College London) , Paul R. Shearing (University College London) , Noriyoshi Matsumi (Japan Advanced Institute of Science and Technology) , Jawwad A. Darr (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Electrochimica Acta

State: Published (Approved)
Published: August 2019
Diamond Proposal Number(s): 14239

Open Access Open Access

Abstract: Several nano-sized mixed molybdenum/vanadium oxide monoclinic solid solutions were synthesised using a continuous hydrothermal flow process and studied with a wide range of physical characterization techniques including X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy and X-ray absorption spectroscopy. The nanomaterials were tested as anodes for Li-ion batteries in the potential range 0.05–3.00 V vs. Li/Li+. Samples with nominal formulas of Mo0.5V0.5O2 and Mo0.33V0.67O2 showed excellent performance, especially at high current rates, due to their highly pseudocapacitive charge storage mechanism. At a specific current of 10 A g−1, Mo0.5V0.5O2 and Mo0.33V0.67O2 showed specific capacities of ca. 200 and 170 mAh g−1, respectively. Mo0.5V0.5O2 also showed good cyclability, with a specific capacity of 480 mAh g−1 after 150 cycles at a specific current of 0.5 A g−1. For cyclic voltammetries conducted at high scan rates, pseudocapacitive charge storage contributed more than 90% to the total charge storage for both samples. The scalability of the synthesis technique and excellent electrochemical performance at high power make these materials promising as negative electrode active materials for Li-ion batteries.

Journal Keywords: Continuous hydrothermal flow synthesis; Molybdenum-vanadium oxide; Nanoparticles; Solid solution; Li-ion battery

Diamond Keywords: Batteries; Lithium-ion

Subject Areas: Chemistry, Materials, Energy

Instruments: B18-Core EXAFS

Added On: 14/08/2019 10:41


Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)