Journal
JOURNAL OF POWER SOURCES
Volume 249, Issue -, Pages 349-356Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.10.026
Keywords
Lithium ion battery; Solid oxide fuel cell; Tortuosity; X-ray tomography; Three dimensional structure; Novel charaterization
Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- National Science Foundation [DMR-0907639/0907030]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0907030, 0907639] Funding Source: National Science Foundation
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A distance propagation method is presented for calculating tortuosity with relatively low computation time from three-dimensional (3D) tomographic data. Moreover, a novel concept of tortuosity distribution is developed to provide a more comprehensive picture of inhomogeneous microstructures where tortuosity depends on the actual 3D paths. Instead of using one single tortuosity value, the tortuosity distribution both as spatial distribution map and also statistic histogram can provide a more complete description. The method, which can be applied to any porous medium, is tested against a diffusion-based tortuosity calculation on two 3D microstructures: a LiCoO2 cathode electrode of lithium ion battery measured by x-ray nano-tomography and a lanthanum strontium rnanganite-ttria-stabilized zirconia, solid oxide fuel cells cathode measured using focused ion beam-scanning electron microscopy serial sectioning. The present method is shown to provide good-agreement with the effective diffusion-based tortuosity values. (C) 2013 Elsevier B.V. All rights reserved.
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