Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 2, Pages 504-510Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.08.068
Keywords
Pulsed magnetic field; Hydrothermal method; Aging technique; CMC (carboxymethyl cellulose) binder; Lithium-ion batteries
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Funding
- Australian Research Council [CE0561616]
- Australian Research Council [CE0561616] Funding Source: Australian Research Council
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Co3O4 nanoparticle samples were prepared as anode materials for lithium-ion batteries by the hydrothermal synthesis method without magnetic field (Co3O4-0T), under pulsed magnetic field (Co3O4-4T), and by using an aging technique (Co3O4-Aging), respectively. The morphology and structural properties of the Co3O4 nanoparticles were investigated by field-emission scanning electron microscopy (FE-SEM), and X-ray diffraction (XRD). FE-SEM measurements demonstrated that the Co3O4 sample formed under a 4T magnetic field consisted of large agglomerated spheres composed of numerous quasi-spherical nanoparticles with a typical diameter of similar to 25 nm and had more compact and smoother surfaces compared to a reference sample prepared without magnetic field. After the aging process, large Co3O4 hollow spheres composed of numerous spherical nanoparticles with a typical diameter of similar to 20 nm were formed. Electrochemical measurements showed that Co3O4 materials prepared by the aging technique (Co3O4 - Aging) yielded the best electrochemical performance compared with the other samples. Capacities were maintained at 274,348, and 407 mAh g(-1) up to 100 cycles for the Co3O4-0T, Co3O4-4T, and Co3O4-Aging materials, which are about 26,27, and 30% of initial discharge capacities. respectively. The capacity loss is in the order of Co3O4-Aging
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