Journal
ELECTROCHIMICA ACTA
Volume 365, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137355
Keywords
Hexagonal MoO3; Carbon compounds composites; Lithium ion batteries; Electrochemical performance; Aged anodes characterization
Categories
Funding
- MINECO [MAT2017-84118-C2-2-R, MAT2017-82252-R]
- Banco Santander-UCM [PR87/19-22613]
- Progetto strategico di ricerca EuroFEL
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Hexagonal molybdenum trioxide microrods and their composites with graphite, graphene, and graphene oxide were successfully synthesized using a soft chemistry route. These composites showed excellent performance as anodes in lithium-ion batteries, with high specific capacities and stability at high current densities.
Hexagonal molybdenum trioxide (h-MoO3) microrods and their composites with graphite, graphene and graphene oxide (GO) are successfully synthesized by a soft chemistry route. The structural, compositional and electronic characteristics of the samples, investigated by a wide range of experimental techniques, evidence that the properties of the carbon material are preserved while yielding phase pure, highly crystalline oxide microstructures. h-MoO3 graphene and GO composites show excellent performance as Li ion batteries (LIBs) anodes. Precisely, h-MoO3 GO electrodes deliver a remarkable specific capacity of 789 mA h g(-1) after 100 cycles at a high current density of 10 0 0 mA g(-1) , while h-MoO3 graphene electrodes show an excellent stability at very high current densities, with specific capacities of 665 mA h g(-1) and 490 mA h g(-1) at 20 0 0 and 3000 mA g(-1). The uniformly dispersed graphene and GO layers increase the structural stability of the composites and create a conductive network ensuring effective ambipolar diffusion of electrons and Li+ ions, as revealed by electrochemical impedance spectroscopy measurements and scanning electron microscopy of the cycled electrodes. These results expand the potential applications of h-MoO3 composites towards LIBs, paving the way for future improvements in this energy storage field. (c) 2020 Elsevier Ltd. All rights reserved.
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