Exfoliation and Reassembly of Cobalt Oxide Nanosheets into a Reversible Lithium-Ion Battery Cathode
NORTHWESTERN UNIV EVANSTON IL DEPT OF CHEMISTRY
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An exfoliation reassembly activation ERA approach to lithium-ion battery cathode fabrication is introduced, demonstrating that inactive HCoO2 powder can be converted into a reversible Lisub 1-xHsub xCoOsub 2 thin-film cathode. This strategy circumvents the inherent difficulties often associated with the powder processing of the layered solids typically employed as cathode materials. The delamination of HCoOsub 2 via a combination of chemical and mechanical exfoliation generates a highly processable aqueous dispersion of CoOsub 2 nanosheets that is critical to the ERA approach. Following vacuum-assisted self-assembly to yield a thin-film cathode and ion exchange to activate this material, the generated cathodes exhibit excellent cyclability and discharge capacities approaching that of low-temperature-prepared LiCoOsub 2 83 mAh gexpn 1, with this good electrochemical performance attributable to the high degree of order in the reassembled cathode.
- Inorganic Chemistry
- Electrical and Electronic Equipment
- Electrochemical Energy Storage
- Atomic and Molecular Physics and Spectroscopy