Spatial quantification of dynamic inter and intra particle crystallographic heterogeneities within lithium ion electrodes.

ABSTRACT: The performance of lithium ion electrodes is hindered by unfavorable chemical heterogeneities that pre-exist or develop during operation. Time-resolved spatial descriptions are needed to understand the link between such heterogeneities and a cell's performance. Here, operando high-resolution X-ray diffraction-computed tomography is used to spatially and temporally quantify crystallographic heterogeneities within and between particles throughout both fresh and degraded Li_xMn₂O₄ electrodes. This imaging technique facilitates identification of stoichiometric differences between particles and stoichiometric gradients and phase heterogeneities within particles. Through radial quantification of phase fractions, the response of distinct particles to lithiation is

SUBMITTER: Finegan DP 

PROVIDER: S-EPMC6994469 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature