Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 21, Pages 18971-18980Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am504851s
Keywords
graphene aerogel; cobalt carbonate; cobalt oxide; hydrothermal process; anode; Li-ion battery
Funding
- Research Grants Council of Hong Kong SAR (GRF Project) [613811, 613612]
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Nanocomposites consisting of ultrafine, cobalt carbonate nanoneedles and 3D porous graphene aerogel (CoCO3/GA) are in situ synthesized based on a one-step hydrothermal route followed by freeze-drying. A further heat treatment produces cobalt oxide nanopartides embedded in the conductive GA matrix (Co3O4/GA). Both the composite anodes deliver excellent specific capacities depending on current density employed: the CoCO3/GA anode outperforms the Co3O4/GA anode at low current densities, and vice versa at current densities higher than 500 mA g(-1). Their electrochemical performances are considered among the best of similar composite anodes consisting of CoCO3 or Co3O4 active particles embedded in a graphene substrate. The stable multistep electrochemical reactions of the carbonate compound with a unique nanoneedle structure contribute to the excellent cyclic stability of the CoCO3/GA electrode, whereas the highly conductive networks along with low charge transfer resistance are responsible for the high rate performance of the Co3O4/GA electrode.
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