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Nanostructure design of amorphous FePO4 facilitated by a virus for 3 V lithium ion battery cathodes

Title
Nanostructure design of amorphous FePO4 facilitated by a virus for 3 V lithium ion battery cathodes
Author
이윤정
Keywords
ELECTROCHEMICAL PERFORMANCE; ELECTRODE PERFORMANCE; MESOPOROUS FEPO4; SELECTION; CELLS
Issue Date
2011-01
Publisher
ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Citation
JOURNAL OF MATERIALS CHEMISTRY 권: 21 호: 4 페이지: 1033-1039
Abstract
Amorphous iron phosphate nanowires with diameters of 10 to 20 nm were synthesized using genetically engineered M13 virus for lithium ion battery cathodes. Hydrolysis of Fe3+ ions has been effectively suppressed by forming conjugates with the virus and synthesizing at low temperature, 4 degrees C. The M13 virus biological template facilitated elaborate nanostructure design and environmentally benign, low temperature synthesis. By implementing heterostructures with silver, we demonstrated experimentally that uniformly distributed Ag nanoparticles throughout the whole structure appeared more advantageous than locally limited network formation by Ag nanowires in enhancing overall electronic conductivity of the entire system, thereby improving battery performances. Electrochemical properties were further improved by dehydration of structural waters. The synergetic use of biological template and synthetic chemistry could enable the synthesis of anhydrous a-FePO4 without thermal treatment via low-temperature and eco-efficient chemistry. The first discharge capacity at a discharge rate of C/10 and 1C was 165 mA h g(-1) (93% of the theoretical value) and 110 mA h g(-1), respectively. These electrochemical properties are comparable to the best reported values for a-FePO4 synthesized at high temperature. In this study, we set the important step for the practical applications of biological approaches in designing and fabricating energy devices, which may be a promising alternative to the traditional processing techniques that consume energy and are costly.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2011/JM/C0JM02544E#!divAbstract
ISSN
0959-9428; 1364-5501
DOI
10.1039/c0jm02544e
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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