Controlling MoO2 and MoO3 phases in MoOx/CNTs nanocomposites and their application to anode materials for lithium-ion batteries and capacitors
- Dongguk Univ., Seoul (Korea, Republic of)
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Div.
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. Here, 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.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; National Research Foundation of Korea (NRF); Ministry of Trade, Industry & Energy (MOTIE)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1809062
- Alternate ID(s):
- OSTI ID: 1811465
OSTI ID: 1815148
- Report Number(s):
- BNL--221837-2021-JAAM
- Journal Information:
- Electrochimica Acta, Journal Name: Electrochimica Acta Vol. 388; ISSN 0013-4686
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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