Rate-Induced Solubility and Suppression of the First-Order Phase Transition in Olivine LiFePO4

被引：149

作者：

Zhang, Xiaoyu ^{[1
]}

van Hulzen, Martijn ^{[1
]}

Singh, Deepak P. ^{[1
]}

Brownrigg, Alex ^{[2
]}

Wright, Jonathan P. ^{[2
]}

van Dijk, Niels H. ^{[1
]}

Wagemaker, Marnix ^{[1
]}

机构：

[1] Delft Univ Technol, Dept Radiat Sci & Technol, NL-2629 JB Delft, Netherlands

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

NANO LETTERS | 2014年 / 14卷 / 05期

基金：

欧洲研究理事会;

关键词：

LiFePO4; phase transformation; Li-ion batteries; nanomaterials; solid solution; SOLID-SOLUTION; PARTICLE-SIZE; ROOM-TEMPERATURE; LIXFEPO4; NANOPARTICLES; KINETICS; PERFORMANCE; SEPARATION; IMPACT; ELECTRODES;

D O I：

10.1021/nl404285y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：2279 / 2285

页数：7

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