Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 7, Pages 4801-4812Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00456
Keywords
magnetite; nanorods; morphology; anode; Li-ion battery
Funding
- Center for Mesoscale Transport Properties, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0012673]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0012704]
- Knapp Chair in Energy and the Environment
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As a matter of synthetic novelty, Fe3O4 (magnetite) nanorods (NRs) have been successfully generated by using a reproducible four -step protocol, wherein goethite is initially produced, morphologically tuned, chemically treated with a passivating agent to reduce aggregation, and ultimately converted to magnetite by thermal annealing within a reductive atmosphere. Our equally important objective was in correlating electrochemical behavior with the unique morphology of these Fe3O4 anode materials. As such, both conventionally coated and binder-free electrodes were tested using as -prepared magnetite NRs and nanoparticles (NPs) with controlled crystallite size as the active materials. Our study revealed that both the NR and NP Fe3O4 materials were amenable to effective binder-free electrode design. For the conventionally coated electrodes, the NR electrodes demonstrated an improved rate capability using a sequential discharge/charge current density profile as compared with that for corresponding NP electrodes. Most significantly, within the cycling stability test, the NR electrode delivered a high and stable capacity with a superior capacity retention relative to that of the NP for more than SO cycles in half cells and 100 cycles in full cells. These data in particular showcase the undeniable benefits of the anisotropic structure of the material.
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