Mesoporous hexagonal Co<inf>3</inf>O<inf>4</inf> for high performance lithium ion batteries

Publication Type:
Journal Article
Scientific Reports, 2014, 4
Issue Date:
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© 2014 Macmillan Publishers Limited. Mesoporous Co3O4 nanoplates were successfully prepared by the conversion of hexagonal β-Co(OH) 2 nanoplates. TEM, HRTEM and N2 sorption analysis confirmed the facet crystal structure and inner mesoporous architecture. When applied as anode materials for lithium storage in lithium ion batteries, mesoporous Co3O4 nanocrystals delivered a high specific capacity. At 10 C current rate, as-prepared mesoporous Co3O4 nanoplates delivered a specific capacity of 1203 mAh/g at first cycle and after 200 cycles it can still maintain a satisfied value (330 mAh/g). From ex-situ TEM, SAED and FESEM observation, it was found that mesoporous Co3O4 nanoplates were reduced to Li2O and Co during the discharge process and re-oxidised without losing the mesoporous structure during charge process. Even after 100 cycles, mesoporous Co3O4 crystals still preserved their pristine hexagonal shape and mesoporous nanostructure.
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