Visualization of anisotropic-isotropic phase transformation dynamics in battery electrode particles

Jiajun Wang, Yu-chen Karen Chen-Wiegart, Christopher Eng, Qun Shen and Jun Wang ()
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Jiajun Wang: Photon Science, National Synchrotron Light Source II, Brookhaven National Laboratory
Yu-chen Karen Chen-Wiegart: Photon Science, National Synchrotron Light Source II, Brookhaven National Laboratory
Christopher Eng: Photon Science, National Synchrotron Light Source II, Brookhaven National Laboratory
Qun Shen: Photon Science, National Synchrotron Light Source II, Brookhaven National Laboratory
Jun Wang: Photon Science, National Synchrotron Light Source II, Brookhaven National Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Anisotropy, or alternatively, isotropy of phase transformations extensively exist in a number of solid-state materials, with performance depending on the three-dimensional transformation features. Fundamental insights into internal chemical phase evolution allow manipulating materials with desired functionalities, and can be developed via real-time multi-dimensional imaging methods. Here, we report a five-dimensional imaging method to track phase transformation as a function of charging time in individual lithium iron phosphate battery cathode particles during delithiation. The electrochemically driven phase transformation is initially anisotropic with a preferred boundary migration direction, but becomes isotropic as delithiation proceeds further. We also observe the expected two-phase coexistence throughout the entire charging process. We expect this five-dimensional imaging method to be broadly applicable to problems in energy, materials, environmental and life sciences.

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12372

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DOI: 10.1038/ncomms12372

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