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

Journal Article · · Electrochimica Acta
 [1];  [2];  [3];  [1]
  1. Dongguk Univ., Seoul (Korea, Republic of)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  3. 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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