2024-03-28T20:35:20Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/955722016-02-18T03:07:35Zcom_10261_89com_10261_3col_10261_342
DIGITAL.CSIC
author
Zeng, G.
author
Caputo, Riccarda
author
Carriazo, Daniel
author
Luo, Li
author
Niederberger, M.
2014-04-15T11:47:45Z
2014-04-15T11:47:45Z
2013
Chemistry of Materials 25(17): 3399-3407 (2013)
http://hdl.handle.net/10261/95572
10.1021/cm400995g
LiFePO4 typically crystallizes in the olivine-type phase (denoted as α-phase hereafter). When high pressure (65 kbar) and elevated temperature (900 C) are applied, the α-LiFePO4 transforms into a high-pressure phase (denoted as β-phase hereafter). Here, we report a facile approach to directly tailor the two polymorphs of LiFePO4 in a controlled way under mild conditions. Employing a microwave-assisted nonaqueous route, highly crystalline LiFePO4 with either α- or β-phase can be efficiently synthesized within 3 min, by simply tuning the ratio of the solvents, benzyl alcohol, and 2-pyrrolidinone. The resulting β-LiFePO4 particles exhibit a hierarchical self-assembled bow-tie-like microstructure, whereas the α-phase consists of nanoplates. In addition, the β-phase irreversibly transforms into the α-phase upon heat treatment without alteration of the morphology. After carbon-coating, α-LiFePO4 and phase-transformed β-LiFePO4, that is, α-LiFePO4 with the hierarchical morphology of the β-phase, exhibit excellent electrochemical performance, whereas pristine β-LiFePO4 displays unfavorable properties. Density functional total energy calculations are performed to get the relative energies and lattice stability of the two phases. A qualitative understanding of the poor electrochemical performance of the β-phase can be deduced from the molecular dynamics of the mobile Li ions in both structures. © 2013 American Chemical Society.
eng
closedAccess
Microwave synthesis
LiFePO4
Lithium-ion batteries
Tailoring two polymorphs of LiFePO4 by efficient microwave-assisted synthesis: A combined experimental and theoretical study
artículo
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accesoRestringido.pdf.txt
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accesoRestringido.pdf.txt