Journal
ELECTROCHIMICA ACTA
Volume 96, Issue -, Pages 134-140Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.01.043
Keywords
Co(OH)(2) material; Room-temperature; Co3O4 (111); Lithium batteries
Categories
Funding
- NSFC [21273184, 21003102, 21021002]
- 863 program [2011AA11A254]
- 973 program [2009CB220102]
- NFFTBS [J1210014]
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The beta-Co(OH)(2) sheets with uniform hexagonal shape were prepared using NaBH4 as the structure directing agent at room temperature. After thermal annealing in air at 450 degrees C for 2 h, the as-prepared beta-Co(OH)(2) sheets were converted into porous Co3O4 with the hexagonal sheet-like morphology (H-Co3O4). The textural properties of the as-prepared samples were characterized by field-emission scanning electron microscopy, transmission electron microscopy and powder X-ray diffraction. The results of lithium storage capability indicate that the H-Co3O4 electrode exhibits excellent cycleability and rate capacity. At a charge/discharge current density of 50 mA g(-1), a reversible capacity of 914 mAh g(-1) can be maintained after 40 cycles. When the current density is increased to 1600 mAh g(-1), a reversible capacity of 800 mAh g(-1) can be still obtained. The superior electrochemical performance is attributed to the porous 2D structures with a finite lateral size and enhanced open-edges, which facilitate Li-ion and electron diffusion through active materials. (C) 2013 Elsevier Ltd. All rights reserved.
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