Journal
SMALL
Volume 8, Issue 7, Pages 1110-1116Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201101131
Keywords
self-assembly; electrochemistry; batteries; lithium; nanotechnology
Categories
Funding
- NSF through the Materials Research Science and Engineering Center at Northwestern University [DMR-0520513]
- US DOE (FreedomCAR and Vehicle Technologies Office)
- ARO [W991NF-09-1-0541]
- NSF-ACC [CHE-0936924]
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An exfoliationreassemblyactivation (ERA) approach to lithium-ion battery cathode fabrication is introduced, demonstrating that inactive HCoO2 powder can be converted into a reversible Li1-xHxCoO2 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 HCoO2 via a combination of chemical and mechanical exfoliation generates a highly processable aqueous dispersion of [CoO2]- 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 LiCoO2 (similar to 83 mAh g-1), with this good electrochemical performance attributable to the high degree of order in the reassembled cathode.
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