Exfoliation and reassembly of cobalt oxide nanosheets into a reversible lithium-ion battery cathode.
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.
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113, USA.
Owen C
OC
Compton
Ali
A
Abouimrane
Zhi
Z
An
Marc J
MJ
Palmeri
L Catherine
LC
Brinson
Khalil
K
Amine
SonBinh T
ST
Nguyen
D003035:Cobalt / Q000737:chemistry*; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D010087:Oxides / Q000737:chemistry*
D010087:Oxides; D003035:Cobalt; D008094:Lithium; C060728:cobalt oxide