Simulation of local ion transport in lamellar block copolymer electrolytes based on electron micrographs [electronic resource].
- Published
- Washington, D.C. : United States. Office of the Assistant Secretary of Energy Efficiency and Renewable Energy, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy - Physical Description
- pages 266-274 : digital, PDF file
- Additional Creators
- Lawrence Berkeley National Laboratory, United States. Office of the Assistant Secretary of Energy Efficiency and Renewable Energy, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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- Free-to-read Unrestricted online access
- Summary
- A method is presented in this paper to relate local morphology and ionic conductivity in a solid, lamellar block copolymer electrolyte for lithium batteries, by simulating conductivity through transmission electron micrographs. The electrolyte consists of polystyrene-block-poly(ethylene oxide) mixed with lithium bis(trifluoromethanesulfonyl) imide salt (SEO/LiTFSI), where the polystyrene phase is structural phase and the poly(ethylene oxide)/LiTFSI phase is ionically conductive. The electric potential distribution is simulated in binarized micrographs by solving the Laplace equation with constant potential boundary conditions. A morphology factor, f, is reported for each image by calculating the effective conductivity relative to a homogenous conductor. Images from two samples are examined, one annealed with large lamellar grains and one unannealed with small grains. The average value off is 0.45 ± 0.04 for the annealed sample, and 0.37 ± 0.03 for the unannealed sample, both close to the value predicted by effective medium theory, 1/2. Simulated conductivities are compared to published experimental conductivities. The value of fUnannealed/fAnnealed is 0.82 for simulations and 6.2 for experiments. Simulation results correspond well to predictions by effective medium theory but do not explain the experimental measurements. Finally, observation of nanoscale morphology over length scales greater than the size of the micrographs (~1 μm) may be required to explain the experimental results.
- Report Numbers
- E 1.99:1408414
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- Other Subject(s)
- Note
- Published through SciTech Connect.
12/19/2016.
"ark:/13030/qt7kq6j6h7"
Journal of Polymer Science. Part B, Polymer Physics 55 3 ISSN 0887-6266 AM
Mahati Chintapalli; Kenneth Higa; X. Chelsea Chen; Venkat Srinivasan; Nitash P. Balsara. - Funding Information
- AC02-05CH11231
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