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  • Title: Exfoliation and reassembly of cobalt oxide nanosheets into a reversible lithium-ion battery cathode.
    Author: Compton OC, Abouimrane A, An Z, Palmeri MJ, Brinson LC, Amine K, Nguyen ST.
    Journal: Small; 2012 Apr 10; 8(7):1110-6. PubMed ID: 22315165.
    Abstract:
    An exfoliation-reassembly-activation (ERA) approach to lithium-ion battery cathode fabrication is introduced, demonstrating that inactive HCoO(2) powder can be converted into a reversible Li(1-x) H(x) CoO(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 HCoO(2) via a combination of chemical and mechanical exfoliation generates a highly processable aqueous dispersion of [CoO(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 LiCoO(2) (~83 mAh g(-1) ), with this good electrochemical performance attributable to the high degree of order in the reassembled cathode.
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