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

Xiaoyu Zhang, Martijn van Hulzen, Deepak P. Singh, Alex Brownrigg, Jonathan P. Wright, Niels H. van Dijk, Marnix Wagemaker

Research output: Contribution to journalArticleAcademicpeer-review

117 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)2279-2285
Number of pages7
JournalNano letters
Volume14
Issue number5
DOIs
Publication statusPublished - 2014
Externally publishedYes

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