期刊
NANO LETTERS
卷 14, 期 5, 页码 2279-2285出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl404285y
关键词
LiFePO4; phase transformation; Li-ion batteries; nanomaterials; solid solution
类别
资金
- European Research Council under the European Union/ERC [307161]
- ALISTORE network
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.
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