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Author

Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Synthesis of nanowire and hollow LiFePO4 cathodes for high-performance lithium batteries

Cited 111 times inthomson ciCited 113 times inthomson ci
Title
Synthesis of nanowire and hollow LiFePO4 cathodes for high-performance lithium batteries
Author
Lim, SunhyeYoon, Chong S.Cho, Jaephil
Keywords
Electric wire; Nanostructured materials; Nanowires
Issue Date
200807
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v.20, no.14, pp.4560 - 4564
Abstract
The synthesis of nanowire and hollow LiFePO4 cathodes using the hard templates KIT-6 and SBA-15 is reported for high-performance lithium batteries. The two-dimensional hexagonal SBA-15 silica template with P6mm symmetry is used for the template that contains parallel cylindrical pores arranged with hexagonal symmetry, which serves to organize the wires into parallel bundles. On the other hand, three-dimensional cubic arrangement of pores in KIT-6 silica with Ia3d symmetry yields hollow morphology with mesopores. After impregnation of the template into a solution or after coating on the template with a solution consisting of LiFePO4 precursors, the silica template is removed and is subsequently fired at 700°C. Electrochemical cycling of both the nanowire and hollow LiFePO4 cathodes demonstrates excellent rate capability even above 10C rate, showing >89% capacity retention of the initial capacity. Among them, the rate capability of the hollow cathode at 15C is higher than that of the nanowire cathode, showing 6% improvement due to its higher Brunauer-Emmett-Teller surface area.
URI
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DOI
http://dx.doi.org/10.1021/cm8006364
ISSN
0897-4756
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