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Issue 17, 2012
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Optimized evolution of a secondary structure of LiFePO4: balancing between shape and impurities

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Abstract

The kinetically helpful hollow secondary structure of LiFePO4 olivine (LFP) was optimized by a balance between its impurities and shape. In a thermodynamic process using hydrothermal treatment (+HyT), a relatively small amount of hollow structure was developed without any impurities by a sequential precipitation method using the difference of the solubility products (Ksp) between two precipitates (Li3PO4 and Fe3(PO4)2). On the other hand, a kinetically controlled process without hydrothermal treatment (−HyT) produced the opposite result of a greater amount of hollow structure with impurities (Li3PO4). By removing the LFP impurities from the latter process (−HyT*), therefore, optimized hollow LFP was obtained without impurities. The resultant cathode material showed enhanced capacities, especially at high rate discharges, due to the improved accessibility of ions into the primary particles of the hollow secondary structure of LFP.

Graphical abstract: Optimized evolution of a secondary structure of LiFePO4: balancing between shape and impurities

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Publication details

The article was received on 19 Jan 2012, accepted on 20 Feb 2012 and first published on 20 Feb 2012


Article type: Paper
DOI: 10.1039/C2JM30403A
Citation: J. Mater. Chem., 2012,22, 8228-8234
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    Optimized evolution of a secondary structure of LiFePO4: balancing between shape and impurities

    M. Lee, T. Kim, Y. S. Kim, J. Park and H. Song, J. Mater. Chem., 2012, 22, 8228
    DOI: 10.1039/C2JM30403A

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