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Self-assembly of hierarchical star-like Co(3)O(4) micro/nanostructures and their application in lithium ion batteries.
MedLine Citation:
PMID:  23354317     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A novel hierarchical star-like Co(3)O(4) was successfully synthesized from self-assembled hierarchical Co(OH)F precursors via a facile hydrothermal method and subsequent annealing in air. The morphological evolution process of the Co(OH)F precursors was investigated by examining the different reaction times during synthesis. First, hexagonal plates are formed, and then nanodiscs grow on the surface of the plates. Subsequently, dissolution and regrowth of Co(OH)F occur to form the star-like hierarchical structures. Co(3)O(4) obtained from thermal decomposition of the Co(OH)F precursor in air at 350 °C exhibited high reversible capacity as an anode material in lithium ion batteries. The specific charge capacity of 1036 mA h g(-1) was obtained in the first cycle at a current density of 50 mA g(-1), and after 100 cycles, the capacity retention was nearly 100%. When the current density was increased to 500 mA g(-1) and 2 A g(-1), the capacities were 995 and 641 mA h g(-1), respectively, after 100 cycles. In addition, a capacity of 460 mA h g(-1) was recorded at a current density of 10 A g(-1) in the rate capability test. The excellent electrochemical performance of the Co(3)O(4) electrodes can be attributed to the porous interconnected hierarchical nanostructures, which protect the small particles from agglomeration and buffer the volume change during the discharge-charge process.
Authors:
Li Li; Kuok Hau Seng; Zhixin Chen; Zaiping Guo; Hua Kun Liu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-28
Journal Detail:
Title:  Nanoscale     Volume:  -     ISSN:  2040-3372     ISO Abbreviation:  Nanoscale     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101525249     Medline TA:  Nanoscale     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Institute for Superconducting and Electronics Materials, University of Wollongong, Wollongong, 2500, Australia. zguo@uow.edu.au.
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