Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 22, Issue 38, Pages 21977-21987Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp04436a
Keywords
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Funding
- DOE Office of Basic Energy Science [DE-AC02-06CH11357]
- Argonne's Laboratory Directed Research & Development (LDRD) program
- DOE's Vehicle Technologies Office
- DOE's Office of Science Graduate Student Research (SCGSR) program
- DOE [DE-SC0014664]
- U.S. Department of Energy Office of Science laboratory [DE-AC02-06CH11357]
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Coin cells are used extensively as test devices in battery research for evaluation of new materials and optimization of cycling protocols. In this study,in situX-ray diffraction profilometry is used to characterize spatial distribution of the active materials, lithiation, and phase distribution in electrodes of NCM523/graphite coin cells. The X-ray data indicate uneven areal compression of the electrode assembly in such cells, which we trace to a specific design feature that leads to elastic deformation of a metal spacer. Steep lithiation gradients observed in the electrodes imply radially-dependent resistivity, for which uneven compression of the separator is a likely cause. Electrochemical model calculations suggest that variable porosity of the polymer separator would account for the salient features of spatial profiles observed in these coin cells.
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