Exfoliation and Reassembly of Cobalt Oxide Nanosheets into a Reversible Lithium-Ion Battery Cathode
Abstract
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 Li(sub 1-x)H(sub x)CoO(sub 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(sub 2) via a combination of chemical and mechanical exfoliation generates a highly processable aqueous dispersion of [CoO(sub 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(sub 2) (~83 mAh g[expn 1]), with this good electrochemical performance attributable to the high degree of order in the reassembled cathode.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2012
- Accession Number
- ADA579339
Entities
People
- Ali Abouimrane
- Khalil Amine
- L. C. Brinson
- Marc J. Palmeri
- Owen C. Compton
- SonBinh Nguyen
- Zhi An
Organizations
- Northwestern University