Controlling MoO2 and MoO3 phases in MoOx/CNTs nanocomposites and their application to anode materials for lithium-ion batteries and capacitors

Daseul Han, Sooyeon Hwang, Seong Min Bak, Kyung Wan Nam

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Molybdenum oxides (MoO2 and MoO3) are attractive anode materials for Li- and Na- ion batteries. Although there have been extensive studies on them individually, systematic and comparative studies are still lacking. In this work, we demonstrate a facile and straightforward synthesis method to control the phase and oxidation state in the MoOx/CNTs nanocomposites via hydrothermal reaction followed by heat-treatment. By changing the gas atmosphere during the annealing process, well-dispersed MoO2/CNTs and MoO3/CNTs nanocomposites are formed without altering their overall morphology. This strategy enables us to investigate the true structure-property correlation of MoOx/CNTs nanocomposites by comparing the structure and electrochemical properties of MoO2/CNTs and MoO3/CNTs. When tested as anode materials for lithium-ion batteries, both HT-MoO2&3/CNTs electrodes show much-improved cycling stability and rate performance compared to the rod-shaped bulk MoO3 electrode. In situ Mo K-edge x-ray absorption spectroscopy (XAS) has been further employed to compare and elucidate Li+ storage mechanisms of both electrodes. When employed to the negative electrode of a high-power lithium-ion capacitor (LIC), the LIC full-cell composed of HT-MoO3/CNTs negative and activated carbon positive electrodes demonstrates impressive energy and power densities (~ 90 Wh kg−1 with 2000 W kg−1) and excellent cycling stability (96.8 % capacity retention after 300 cycles), revealing the versatility of the MoOx/CNTs electrodes in energy applications.

Original languageEnglish
Article number138635
JournalElectrochimica Acta
Publication statusPublished - 2021 Aug 20

Bibliographical note

Funding Information:
The work done at Dongguk University was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT, grant No. 2019R1A2C1007922 ) and by the Ministry of Trade, Industry & Energy (MOTIE, grant No. 20012318 ). S.-M.B at Brookhaven National Laboratory (BNL) was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Vehicle Technologies Office of the DOE through the BMR Program under contract DE-SC0012704. The research used resources of the Center for Functional Nanomaterials and the beamline 7-BM (QAS) of the National Synchrotron Light Source II, DOE Office of Science User Facilities, operated for the DOE Office of Science by BNL under Contract No. DE-SC0012704.

Publisher Copyright:
© 2021

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry


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