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Nano Lett. 2014 May 14;14(5):2279-85. doi: 10.1021/nl404285y. Epub 2014 Apr 9.

Rate-induced solubility and suppression of the first-order phase transition in olivine LiFePO4.

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1
Department of Radiation Science and Technology, Delft University of Technology , Mekelweg 15, 2629JB, Delft, The Netherlands.

Abstract

The impact of ultrahigh (dis)charge rates on the phase transition mechanism in LiFePO4 Li-ion electrodes is revealed by in situ synchrotron diffraction. At high rates the solubility limits in both phases increase dramatically, causing a fraction of the electrode to bypass the first-order phase transition. The small transforming fraction demonstrates that nucleation rates are consequently not limiting the transformation rate. In combination with the small fraction of the electrode that transforms at high rates, this indicates that higher performances may be achieved by further optimizing the ionic/electronic transport in LiFePO4 electrodes.

PMID:
24707878
DOI:
10.1021/nl404285y

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